Journal ArticleDOI
Distortions in definite distance and shape perception as measured by reaching without and with haptic feedback.
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It is shown that outward drift in Experiment 1 was visually driven, and visually guided reaches were accurate when participants used binocular vision but when they used monocular vision, reaches were distorted.Abstract:
Psychophysical studies reveal distortions in perception of distance and shape. Are reaches calibrated to eliminate distortions? Participants reached to the front, side, or back of a target sphere. In Experiment 1, feedforward reaches yielded distortion and outward drift. In Experiment 2, haptic feedback corrected distortions and instability. In Experiment 3, feedforward reaches with only haptic experience of targets replicated the shape distortions but drifted inward. This showed that outward drift in Experiment 1 was visually driven. In Experiment 4, visually guided reaches were accurate when participants used binocular vision but when they used monocular vision, reaches were distorted. Haptic feedback corrected inaccuracy and instability of distance but did not correct monocular shape distortions. Dynamic binocular vision is representative and accurate and merits further study.read more
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Affordance-Based Control of Visually Guided Action
TL;DR: Comparison and contrast existing theoretical approaches to understanding the visual guidance of action are compared and a new approach, affordance-based control, is introduced, which asserts that a primary function of vision is to allow actors to see the world in terms of what they can and cannot do.
Journal ArticleDOI
Advantages of binocular vision for the control of reaching and grasping.
Dean R. Melmoth,Simon Grant +1 more
TL;DR: It is argued that these benefits derive from binocular disparity processing linked to changes in relative hand–target distance, and that this depth information is independently used to regulate the progress of the approaching hand and to guide the digits to the (pre-selected) contact points on the object, thereby ensuring that the grip is securely applied.
Journal ArticleDOI
A brief taxonomy of tactile illusions and demonstrations that can be done in a hardware store.
TL;DR: This paper surveys more than twenty types of tactile illusions and discusses several of their aspects, including the ease with which they can be demonstrated and whether they have clear visual analogs.
Journal ArticleDOI
The Various Perceptions of Distance: An Alternative View of How Effort Affects Distance Judgments
TL;DR: The authors' interpretation is that in the paradigms tested, effort manipulations are prone to influencing response calibration because they encourage participants to take nonperceptual connotations of distance into account while leaving perceived distance itself unaffected.
Journal ArticleDOI
On the relation between object shape and grasping kinematics.
TL;DR: The results indicate that the perceived shape of the cylinder is used for selecting appropriate grasping locations before or early in the movement and that the grip aperture and orientation are gradually attuned to these locations during the movement.
References
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