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Four fundamental dimensions underlie the perception of human actions

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Nick E Barraclough evaluates the actions of other individuals based upon a variety of movements that can reveal critical information to guide decision making and behavioural responses.

Image courtesy of interviewee. February 6, 2024

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This video video discusses the concept of action perception, which involves recognizing and evaluating the actions of others. It provides an example of observing someone crossing the road and highlights how we make judgments based on various traits such as speed, direction, and intention behind the action. The author introduces the idea of "conceptual spaces" — mental frameworks where we categorize and assess actions based on their characteristics.

A detailed study was conducted to explore the conceptual space underlying action perception, utilizing motion capture technology to record 240 different actions performed by actors. The findings revealed four main dimensions through exploratory factor analysis (EFA) that people use to evaluate actions:

1. **Friendliness** – Evaluating actions on a scale from positive/prosocial to negative/untrustworthy.
2. **Formalness** – Assessing perceived power and strength, ranging from dominant to weak.
3. **Plannedness** – Determining intentionality, from intentional and controlled actions to spontaneous and uncontrolled ones.
4. **Abduction** – Focusing on movements of limbs towards or away from the body.

The study found that judgments about friendliness and power are made quickly, likely due to their importance in social interactions, while evaluations of intentionality occur more slowly. The research suggests a possible overlap in the evaluation dimensions of actions and facial traits, implicating shared conceptual spaces in how we assess social information.

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X-TIMESTAMP-MAP:LOCAL=00:00:00.000,MPEGTS=900000

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The action perception is the detection

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and the evaluation of actions executed by other humans.

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So for an example,

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let's say you are watching someone cross

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a road in front of you.

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Now we can evaluate that action on

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multiple different qualities.

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For example, we see the speed that the person is walking at,

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we see the direction in which they're moving.

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We can see that they're moving quite fluently, for example,

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we can recognize what they're doing.

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We can see it as a, as a sort of jog may perhaps, or a walk.

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Um, we can work out the goal of the action, for example,

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that they're crossing the road.

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Uh, we can even infer something about the individual's

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mental state from their actions.

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So you can, you can work out perhaps whether they look happy

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or just from the way that they move,

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and also also infer things like the

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intention of the individual.

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Perhaps they're crossing the road excitedly,

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because they've seen someone on the other side of the road

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and they're trying to meet them.

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So when we see an action executed by someone else,

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we, we, we make lots of judgments about,

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about that actions.

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And we can derive lots of characteristics from,

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from the way people move.

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Now, the principles underlying the way that we see

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and make sense of those actions, well,

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we think they are represented within,

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something called a conceptual space.

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Because the way that we recognize and,

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and form mental representations

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of things in our environments are within these mental

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frameworks, or, or conceptual or psychological spaces.

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So other things that we see in our environment, for example,

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colors or, textures

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or movements or faces

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and things that we detect with other sensors,

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for example, odors or,

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or the feeling of, roughness with our hands.

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These, these items

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or these domains are also represented

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within conceptual spaces.

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Um, and it's conceptual space describes basically,

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the properties of that, of that type of item.

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And conceptual spaces capture the similarities

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and the differences between different items

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within that domain.

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So the, this, this, this organization allows the

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classification, the naming,

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and the responses to that particular item.

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Now, within a conceptual space, things that we see

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and think of as particularly similar

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to each other are represented close to each other.

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And things that are, seem very different from each other,

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we might respond differently to them, are, are,

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are represented far apart within that,

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within that space.

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So we went into this project,

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Trying to think about, well, what is the conceptual space

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that underlies action perception?

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So we know that we perceive actions on all these different

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characteristics in terms of speed, direction,

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fluency, so on.

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Well, what are the important ones?

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Uh, what are those important factors underlying

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how we make sense, and,

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and represent the actions of other people.

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So because we didn't know,

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because we didn't know the, the space that,

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represents actions, we had some,

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we have some other evidence that suggests, that it's,

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actions of represented in terms of similarity.

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And we knew that there were perhaps certain, levels

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of understanding between more concrete, mid-level

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and perhaps more abstract levels

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of representation of actions.

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We wanted to, well just take a data-driven approach

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to working out, the conceptual space under action.

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So just let, let's, let's look at a big range of actions.

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There's bigger range of actions that we could get hold of,

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and also to get humans to evaluate those actions on

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as number of different characteristics as, as many

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as we could sort of reasonably fit into, an experiment.

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So what we did,

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in our experiment was first of all to, is first of all

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to capture this large range of different actions.

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So we used, a technique known as motion capture.

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So we had actors wearing suits

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that were wearing motion capture suits,

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which essentially have little,

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detectors on bits of the body.

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There's 32 separate detectors on, on the head, shoulders,

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knees, toes, fingers, elbows, and so on.

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So we can capture the movements of those actors within,

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the three, three dimensional environment.

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And we asked actors.

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We had, four different actors, two male, two female,

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and they performed a number of different actions,

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240 different actions.

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Everyone performed every action three times.

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Uh, and then we selected the best, most representative

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actions across all these different actors.

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And these actions range from things like, walking,

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standing, cutting, throwing, catching, petting a dog,

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just a whole range of different action as,

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as many things as we could, realistically

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actually capture the certain types

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of actions we couldn't capture.

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For example, swimming, was not going to work

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with our motion capture suits, for example.

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Uh, but, but in general, it's just

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as many different actions as possible.

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Then we took that data that that motion capture data

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to animate an avatar.

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So, this avatar was a, a three-dimensional,

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we call it a volumetric puppet.

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It's a three-dimensional a avatar.

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It doesn't have a face, doesn't have any clothes on,

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but it has the, the shape of the human and it's gray.

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And then the reason why we, we had an avatar like this was

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to exclude information from other, other types

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of body information so we can judge people on their faces,

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perhaps on what they're wearing, you know, on the size

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of the body and so on.

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Uh, we didn't want that information to sort

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of confound what we're looking at.

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Actually, the, the information we're really interested in

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about the actions is the posture.

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So that's the position of the body

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and also the way that the actor actually moves.

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So we use these, this motion capture data

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to animate the avatar,

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and then we've got 230 people to rate those,

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all those different actions on a range

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of different characteristics from sort of how,

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how fast they're moving, whether they look sociable,

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whether they, look trustworthy,

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whether they look strong and so on.

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And so with that data, we then use the technique known as,

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exploratory factor analysis or EFA.

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Now, EFA essentially is a data reduction technique.

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It takes this data and looks for the

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underlying latent factors

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or these sort of explana, the, these dimensions

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that underlie these, these ratings

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of these different actions.

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What we found with the, the EFA was that there were

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four principle dimensions that underlie the way that people

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evaluate the actions of other people.

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Now, two of those dimensions were particularly important

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and explained a lot of their behavior,

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and two, dimensions a little less important, but,

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but equally, they were still important.

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Uh, so the first two dimensions, which we,

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we think are the most important, was the evaluation

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of actions on friendliness.

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So wherever an action is happy

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or seen as trustworthy, or positive or pro-social

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and in contrast, perhaps as untrustworthy

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or angry, at the other end of this dimension.

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So this is a sort of valence dimension.

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We called it friendliness,

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but it's essentially, it's a, an evaluation of, of valence.

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Uh, now, the second dimension that was also important was

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that we called it formalness.

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Um, but this,

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this latent factor really underlies our perceptions

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of power, of speed, of strength,

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of whether someone is dominant or not.

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Uh, and on the other end of that dimension, of course,

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is sort of more weaker, and,

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and more, more fine types of actions.

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So these two, these two dimensions seem

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to be the two most important ones,

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but there were two other dimensions

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that were also pretty important as well, explained, a, a,

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a degree of the variance, one we call planned,

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But essentially that, that

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that explains the intentionality of the action.

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So at one end, we'd have actions that were particularly,

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intentional or planned or controlled

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or precise and deliberate.

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And on the other end of the dimension, we had actions

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that are spontaneous or accidental,

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or uncontrolled,

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and of course actions that lay somewhere in between the,

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these two, extremes.

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And our fourth dimension, there's one we call abducting,

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which is essentially, it's quite a, it's quite a sort

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of movement focused, dimension.

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So abducting is the movement

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of limbs away from the body like this.

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And abducting is moving, limbs towards,

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towards the body.

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So actions that involved in pushing things away,

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or expelling things

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or throwing things would be at one end of the dimension.

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And at the other end would be, actions

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of people picking things up or bringing things towards them,

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or hugging them or drinking

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or bringing things in towards the body.

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So these are the four main dimensions that we find,

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within our, our model

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and the representation of, of actions.

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We didn't set out to look at how fast people are at, at,

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at making these judgements about other actions.

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We were actually interested in the ratings of them and the,

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and this conceptual space.

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But what fell out, fell, fell out of our data was

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that people actually make judgments of,

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whether someone is pro-social or happy or trustworthy.

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We make that judgment the quickest.

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It was the, in all our data,

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people made this judgment quick.

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Um, and we think that well, actually,

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if you are trying to work out

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what someone in your environment is doing,

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this is probably one of the most important things

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that we need to be able to make a judgment of.

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You know, are they a friend?

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Are they being difficult to, they potentially a foe?

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Uh, these are, these are important judgements for us

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as humans to decide, well, should I interact

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with this person or should, perhaps I should avoid them.

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So making that decision early on and quick is important.

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I mean, okay, maybe may, maybe we don't have to.

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Um, it might not save our life at this point in time,

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but,

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but it is an important judgment even in the modern world

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Now, secondly, we also see that judgments of power

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and strength and speed are also quite quick, just not

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as quick as friendness, but, and nearly as quick.

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Um, and,

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and that's also an important judgment, determining,

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you know, okay, someone is, is a threat.

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Well, could they possibly carry out

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that threat? Um,

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Have they got the strength

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or that power in order to be able to carry that strength?

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That's also an important thing.

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Whereas we found that judgments

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of things like intentionality, whether it's a sort

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of deliberate or whether it's controlled

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or planned action, that, that, that tends to, we, we make

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that judgment later on in time

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because it's not so important.

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Um, you know, you can, you, you can work

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that out a little bit later.

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You know, first of all, you need

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to decide whether someone is,

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is performing an action in,

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in a friendly prosocial way or not.

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What our findings show is these two

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principle dimensions in two additional dimensions.

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Now, the two primary dimensions, they look very similar to

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two of the primary dimensions underlying the evaluation

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of f face traits.

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So other people have found that we evaluate faces on,

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trustworthiness and dominance,

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and possibly a third dimension as well.

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Now, the, the face trait dimension

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of trustworthiness looks quite similar to our,

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friendliness dimension.

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And the face trait dimension of dominance

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also looks pretty similar to our,

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dimension of formidable.

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Now, this suggests that, well, maybe, maybe there is a cross

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category, conceptual spaces that,

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conceptual space that involves not only the evaluation

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of the actions and the behaviors of other people,

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but information you can get from the tr from the face.

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Whereas the other two dimensions that we show,

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the intentionality dimension

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and the abduction dimension, they are very actiony.

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The, the, there's no way that another stimulus like a face

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or a color or a smell could be intentional, yet

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intent of other people is derived from the way

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that they move and they act, within their environment.

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And of course, abducting this movement of the body away,

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parts of the body away from the, from the core

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or towards the core.

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That of course, also has to involve movement information,

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and therefore is also a, a,

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a specific action dimension, we think.

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And so we think those two are very actiony,

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whereas the other two, may,

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may represent some part of a, a, of a cross category,

14:18.005 --> 14:20.195
conceptual space involving other types

14:20.215 --> 14:21.235
of social information.

Understanding Action Perception and Conceptual Spaces

00:00:00 - The action perception is the detection and the evaluation of actions executed by other humans. So for an example, let's say you are watching someone cross a road in front of you. Now we can evaluate that action on multiple different qualities. For example, we see the speed that the person is walking at, we see the direction in which they're moving. We can see that they're moving quite fluently, for example, we can recognize what they're doing. We can see it as a, as a sort of jog may perhaps, or a walk.
00:00:40 - that they're crossing the road. we can even infer something about the individual's mental state from their actions. So you can, you can work out perhaps whether they look happy or just from the way that they move, and also also infer things like the intention of the individual. Perhaps they're crossing the road excitedly, because they've seen someone on the other side of the road and they're trying to meet them. So when we see an action executed by someone else,
00:01:12 - about that actions. And we can derive lots of characteristics from, from the way people move. Now, the principles underlying the way that we see and make sense of those actions, well, we think they are represented within, something called a conceptual space. Because the way that we recognize and, and form mental representations of things in our environments are within these mental
00:01:45 - So other things that we see in our environment, for example, colors or, textures or movements or faces and things that we detect with other sensors, for example, odors or, or the feeling of, roughness with our hands. These, these items or these domains are also represented within conceptual spaces. and it's conceptual space describes basically,
00:02:19 - And conceptual spaces capture the similarities and the differences between different items within that domain. So the, this, this, this organization allows the classification, the naming, and the responses to that particular item. Now, within a conceptual space, things that we see and think of as particularly similar to each other are represented close to each other.
00:02:48 - we might respond differently to them, are, are, are represented far apart within that, within that space. So we went into this project, Trying to think about, well, what is the conceptual space that underlies action perception? So we know that we perceive actions on all these different characteristics in terms of speed, direction, fluency, so on. Well, what are the important ones? what are those important factors underlying

Understanding Human Action Through Motion Capture

00:03:21 - and represent the actions of other people. So because we didn't know, because we didn't know the, the space that, represents actions, we had some, we have some other evidence that suggests, that it's, actions of represented in terms of similarity. And we knew that there were perhaps certain, levels of understanding between more concrete, mid-level and perhaps more abstract levels of representation of actions. We wanted to, well just take a data-driven approach
00:03:55 - So just let, let's, let's look at a big range of actions. There's bigger range of actions that we could get hold of, and also to get humans to evaluate those actions on as number of different characteristics as, as many as we could sort of reasonably fit into, an experiment. So what we did, in our experiment was first of all to, is first of all
00:04:25 - So we used, a technique known as motion capture. So we had actors wearing suits that were wearing motion capture suits, which essentially have little, detectors on bits of the body. There's 32 separate detectors on, on the head, shoulders, knees, toes, fingers, elbows, and so on. So we can capture the movements of those actors within, the three, three dimensional environment. And we asked actors. We had, four different actors, two male, two female,
00:04:57 - 240 different actions. Everyone performed every action three times. and then we selected the best, most representative actions across all these different actors. And these actions range from things like, walking, standing, cutting, throwing, catching, petting a dog, just a whole range of different action as, as many things as we could, realistically
00:05:30 - of actions we couldn't capture. For example, swimming, was not going to work with our motion capture suits, for example. but, but in general, it's just as many different actions as possible. Then we took that data that that motion capture data to animate an avatar. So, this avatar was a, a three-dimensional, we call it a volumetric puppet. It's a three-dimensional a avatar. It doesn't have a face, doesn't have any clothes on, but it has the, the shape of the human and it's gray.
00:06:05 - to exclude information from other, other types of body information so we can judge people on their faces, perhaps on what they're wearing, you know, on the size of the body and so on. we didn't want that information to sort of confound what we're looking at. Actually, the, the information we're really interested in about the actions is the posture. So that's the position of the body and also the way that the actor actually moves. So we use these, this motion capture data

Evaluating Human Actions: Key Dimensions Identified

00:06:36 - and then we've got 230 people to rate those, all those different actions on a range of different characteristics from sort of how, how fast they're moving, whether they look sociable, whether they, look trustworthy, whether they look strong and so on. And so with that data, we then use the technique known as, exploratory factor analysis or EFA. Now, EFA essentially is a data reduction technique.
00:07:07 - underlying latent factors or these sort of explana, the, these dimensions that underlie these, these ratings of these different actions. What we found with the, the EFA was that there were four principle dimensions that underlie the way that people evaluate the actions of other people. Now, two of those dimensions were particularly important and explained a lot of their behavior,
00:07:40 - but equally, they were still important. so the first two dimensions, which we, we think are the most important, was the evaluation of actions on friendliness. So wherever an action is happy or seen as trustworthy, or positive or pro-social and in contrast, perhaps as untrustworthy or angry, at the other end of this dimension. So this is a sort of valence dimension.
00:08:10 - but it's essentially, it's a, an evaluation of, of valence. now, the second dimension that was also important was that we called it formalness. but this, this latent factor really underlies our perceptions of power, of speed, of strength, of whether someone is dominant or not. and on the other end of that dimension, of course, is sort of more weaker, and, and more, more fine types of actions.
00:08:43 - to be the two most important ones, but there were two other dimensions that were also pretty important as well, explained, a, a, a degree of the variance, one we call planned, But essentially that, that that explains the intentionality of the action. So at one end, we'd have actions that were particularly, intentional or planned or controlled or precise and deliberate. And on the other end of the dimension, we had actions
00:09:19 - or uncontrolled, and of course actions that lay somewhere in between the, these two, extremes. And our fourth dimension, there's one we call abducting, which is essentially, it's quite a, it's quite a sort of movement focused, dimension. So abducting is the movement of limbs away from the body like this. And abducting is moving, limbs towards,

Understanding Action Judgments and Dimensions

00:09:47 - So actions that involved in pushing things away, or expelling things or throwing things would be at one end of the dimension. And at the other end would be, actions of people picking things up or bringing things towards them, or hugging them or drinking or bringing things in towards the body. So these are the four main dimensions that we find, within our, our model and the representation of, of actions.
00:10:21 - at making these judgements about other actions. We were actually interested in the ratings of them and the, and this conceptual space. But what fell out, fell, fell out of our data was that people actually make judgments of, whether someone is pro-social or happy or trustworthy. We make that judgment the quickest. It was the, in all our data, people made this judgment quick. and we think that well, actually,
00:10:52 - what someone in your environment is doing, this is probably one of the most important things that we need to be able to make a judgment of. You know, are they a friend? Are they being difficult to, they potentially a foe? these are, these are important judgements for us as humans to decide, well, should I interact with this person or should, perhaps I should avoid them. So making that decision early on and quick is important. I mean, okay, maybe may, maybe we don't have to.
00:11:26 - but, but it is an important judgment even in the modern world Now, secondly, we also see that judgments of power and strength and speed are also quite quick, just not as quick as friendness, but, and nearly as quick. and, and that's also an important judgment, determining, you know, okay, someone is, is a threat. Well, could they possibly carry out that threat?
00:11:54 - or that power in order to be able to carry that strength? That's also an important thing. Whereas we found that judgments of things like intentionality, whether it's a sort of deliberate or whether it's controlled or planned action, that, that, that tends to, we, we make that judgment later on in time because it's not so important. you know, you can, you, you can work that out a little bit later. You know, first of all, you need to decide whether someone is, is performing an action in, in a friendly prosocial way or not.
00:12:27 - principle dimensions in two additional dimensions. Now, the two primary dimensions, they look very similar to two of the primary dimensions underlying the evaluation of f face traits. So other people have found that we evaluate faces on, trustworthiness and dominance, and possibly a third dimension as well. Now, the, the face trait dimension of trustworthiness looks quite similar to our,

Evaluating Actions and Facial Traits Dimensions

00:12:59 - And the face trait dimension of dominance also looks pretty similar to our, dimension of formidable. Now, this suggests that, well, maybe, maybe there is a cross category, conceptual spaces that, conceptual space that involves not only the evaluation of the actions and the behaviors of other people, but information you can get from the tr from the face. Whereas the other two dimensions that we show,
00:13:30 - and the abduction dimension, they are very actiony. The, the, there's no way that another stimulus like a face or a color or a smell could be intentional, yet intent of other people is derived from the way that they move and they act, within their environment. And of course, abducting this movement of the body away, parts of the body away from the, from the core or towards the core. That of course, also has to involve movement information,
00:14:20 - a specific action dimension, we think. And so we think those two are very actiony, whereas the other two, may, may represent some part of a, a, of a cross category, conceptual space involving other types of social information.

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