Perceiving Affordances for Joint Actions

Davis, Tehran J.; Riley, Michael A.; Shockley, Kevin; Cummins-Sebree, Sarah

doi:10.1068/p6712

Cited by 51 publications

(30 citation statements)

References 36 publications

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“…The findings in the present study are at least in part consistent with those from previous studies [1], [2], [4], [8], [9], [10], [17] in that the amplitude of shoulder rotations was proportioned to the critical ratio value. The new finding was that the amplitude of rotations was smaller for the respective ratio value as bar length increased.…”

Section: Discussionsupporting

confidence: 93%

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Rule for Scaling Shoulder Rotation Angles while Walking through Apertures

2012

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BackgroundWhen an individual is trying to fit into a narrow aperture, the amplitude of shoulder rotations in the yaw dimension is well proportioned to the relative aperture width to body width (referred to as the critical ratio value). Based on this fact, it is generally considered that the central nervous system (CNS) determines the amplitudes of shoulder rotations in response to the ratio value. The present study was designed to determine whether the CNS follows another rule in which a minimal spatial margin is created at the aperture passage; this rule is beneficial particularly when spatial requirements for passage (i.e., the minimum passable width) become wider than the body with an external object.Methodology/Principal FindingsEight young participants walked through narrow apertures of three widths (ratio value = 0.9, 1.0, and 1.1) while holding one of three horizontal bars (short, 1.5 and 2.5 times the body width). The results showed that the amplitude of rotation angles became smaller for the respective ratio value as the bar increased in length. This was clearly inconsistent with the general hypothesis that predicted the same rotation angles for the same ratio value. Instead, the results were better explained with a new hypothesis which predicted that a smaller rotation angle was sufficient to produce a constant spatial margin as the bar-length increased in length.ConclusionThe results show that, at least under safe circumstances, the CNS is likely to determine the amplitudes of shoulder rotations to ensure the minimal spatial margin being created at one side of the body at the time of crossing. This was new in that the aperture width subtracted from the width of the body (plus object) was taken into account for the visuomotor control of locomotion through apertures.

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Section: Discussionsupporting

confidence: 93%

“…Another line of evidence is that amplitudes of shoulder rotation are fine-tuned in response to the ratio value [1], [2], [4], [8], [9], [10], [11]. Such a functional relationship was observed even when participants were tested in a virtual reality [8], when running through apertures [4], or when older adults were tested [11].…”

Section: Introductionmentioning

confidence: 99%

Rule for Scaling Shoulder Rotation Angles while Walking through Apertures

2012

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“…Similarly, Davis et al (2010) assessed how two adults performed the joint action of walking through an aperture. First, they established that a “shared” model, rather than an additive model, better predicted the critical boundary for the dyad's actual passage.…”

Section: Perceiving Others' Affordancesmentioning

confidence: 99%

Relating spatial perspective taking to the perception of other's affordances: providing a foundation for predicting the future behavior of others

Creem-Regehr

Gagnon

Geuss

et al. 2013

Front. Hum. Neurosci.

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Understanding what another agent can see relates functionally to the understanding of what they can do. We propose that spatial perspective taking and perceiving other's affordances, while two separate spatial processes, together share the common social function of predicting the behavior of others. Perceiving the action capabilities of others allows for a common understanding of how agents may act together. The ability to take another's perspective focuses an understanding of action goals so that more precise understanding of intentions may result. This review presents an analysis of these complementary abilities, both in terms of the frames of reference and the proposed sensorimotor mechanisms involved. Together, we argue for the importance of reconsidering the role of basic spatial processes to explain more complex behaviors.

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“…For example, using functional magnetic resonance imaging (fMRI) Radke et al [2011] found increased brain activation in the medial prefrontal cortex following errors that had consequences for their co-actor in a cooperative computer gaming task. Similarly, when two people are asked to walk side-by-side through an aperture, they are sensitive to the fit required for the pair to pass through the aperture [Davis et al, 2010]. And we found in our previous study that when pairs cross a virtual road, as compared to singletons, they tend to act together, pick larger gaps, and synchronize their movement when crossing together [Jiang et al, 2016].…”

Section: Joint Action and Road Crossingmentioning

confidence: 96%

Action coordination with agents

Jiang

O’Neal

Rahimian

et al. 2016

Proceedings of the ACM Symposium on Applied Perception

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We investigated how people jointly coordinate their decisions and actions with a computer-generated character (agent) in a largescreen virtual environment. The task for participants was to physically cross a steady stream of traffic on a virtual road without getting hit by a car. Participants performed this task with another person or with a computer-generated character (Fig.1). The character was programmed to be either safe (taking only large gaps) or risky (also taking relatively small gaps). We found that participants behaved in many respects similarly with real and virtual partners. They maintained similar distances between themselves and their partner, they often crossed the same gap with their partner, and they synchronized their crossing with their partner. We also found that the riskiness of the character influenced the gap choices of participants. This study demonstrates the potential for using large-screen virtual environments to study how people interact with CG characters when performing whole-body joint actions.

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Perceiving Affordances for Joint Actions

Cited by 51 publications

References 36 publications

Rule for Scaling Shoulder Rotation Angles while Walking through Apertures

Rule for Scaling Shoulder Rotation Angles while Walking through Apertures

Relating spatial perspective taking to the perception of other's affordances: providing a foundation for predicting the future behavior of others

Action coordination with agents

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