Journal ArticleDOI
Eyeheight-scaled information about affordances: a study of sitting and stair climbing.
TLDR
In this paper, the authors used an existing source of size and distance information that is already scaled with reference to the actor's eye height to predict the perceived and actual critical (maximum) heights of surfaces that afford sitting on or climbing.Abstract:
Previous work has shown that both the perceived and actual critical (maximum) heights of surfaces that afford "sitting on " and "climbing on" can be expressed as constant proportions of each actor's leg length. The current study provides evidence that these judgments of critical action boundaries are based on an existing source of size and distance information that is already scaled with reference to the actor's eyeheight. In Experiment 1 changes in judgments of "perceived eyeheight" (an index of the intrinsic scalar) as a function of viewing distance were shown to be highly correlated with changes in the maximum height that was perceived to afford sitting on or climbing on. In Experiments 2 and 3 observers wore 10-cm blocks and made judgments about whether the heights of various surfaces afforded sitting or climbing. The use of eyeheight-scaled information as the basis for their estimates predicted the obtained pattern of errors in these judgments. With a modicum of experience wearing the blocks, however, observers were able to retune accurately their critical action boundary to a degree that would not have been predicted from their consistent overestimation of the height of the block on which they were standing. These results have implications for understanding how observers obtain information about their specific action boundary.read more
Citations
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Journal ArticleDOI
An Outline of a Theory of Affordances
TL;DR: In this article, a theory of affordances is outlined according to which affordances are relations between the abilities of animals and features of the environment, which are both real and perceivable but are not properties of either the environment or the animal.
Journal ArticleDOI
Affordances as Properties of the Animal-Environment System
TL;DR: In this article, the authors argue that affordances are properties of the animal-environment system, that they are emergent properties that do not inhere in either the environment or the animal.
Journal Article
Information, affordances, and the control of action in sport.
TL;DR: The concept of affordances, a conceptual pillar of the ecological approach to perception and action, has the potential to become a guiding principle for research on perception and actions in sport.
Journal ArticleDOI
Shape selectivity in primate lateral intraparietal cortex
TL;DR: It is shown that many neurons in primate posterior parietal cortex show sensory shape selectivities to simple, two-dimensional geometric shapes while the animal performs a simple fixation task, and these units show shape selectivity equivalent to any shown in the ventral pathway.
References
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Book
The Ecological Approach to Visual Perception
TL;DR: The relationship between Stimulation and Stimulus Information for visual perception is discussed in detail in this article, where the authors also present experimental evidence for direct perception of motion in the world and movement of the self.
Book
Tutorials in motor behavior
George E. Stelmach,Jean Requin +1 more
TL;DR: Models and theories of motor control, representation and control of movement, and Anatomical and behavior contribution to movement.
Journal ArticleDOI
Perceiving affordances : Visual guidance of stair climbing
TL;DR: It is concluded that perception for the control of action reflects the underlying dynamics of the animal-environment system.
Journal ArticleDOI
Visual guidance of walking through apertures: body-scaled information for affordances.
William H. Warren,Suzanne Whang +1 more
TL;DR: This study videotaped large and small subjects walking through apertures to determine empirically the critical aperture-to-shoulder-width ratio (A/S) marking the transition from frontal walking to body rotation and tested the hypothesis that perceptual judgments of "passability" are based on intrinsic or body-scaled information specifying aperture width as a ratio of the observer's eyeheight.