Human perception of shape from touch
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TLDR
The role of active touch in three aspects of shape perception and discrimination studies is focused on, and the presence of strong after-effects after just briefly touching a shape is addressed.Abstract:
In this paper, I focus on the role of active touch in three aspects of shape perception and discrimination studies. First an overview is given of curvature discrimination experiments. The most prominent result is that first-order stimulus information (that is, the difference in attitude or slope over the stimulus) is the dominant factor determining the curvature threshold. Secondly, I compare touch under bimanual and two-finger performance with unimanual and one-finger performance. Consistently, bimanual or two-finger performance turned out to be worse. The most likely explanation for the former finding is that a loss of accuracy during intermanual comparisons is owing to interhemispheric relay. Thirdly, I address the presence of strong after-effects after just briefly touching a shape. These after-effects have been measured and studied in various conditions (such as, static, dynamic, transfer to other hand or finger). Combination of the results of these studies leads to the insight that there are possibly different classes of after-effect: a strong after-effect, caused by immediate contact with the stimulus, that does only partially transfer to the other hand, and one much less strong after-effect, caused by moving over the stimulus for a certain period, which shows a full transfer to other fingers.read more
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References
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Journal ArticleDOI
Adaptation, after-effect and contrast in the perception of curved lines
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Identifying objects by touch: an "expert system".
TL;DR: The present study provides a baseline measure of recognition under those circumstances, and it indicates that haptic object recognition can be both rapid and accurate.
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The useful dimensions of sensitivity.
TL;DR: In this paper, the relation of sensing to perceiving is discussed and it is suggested that a straightforward theory of perception is possible and that it is our understanding of sensation which is confused.
Journal ArticleDOI
Hierarchical Processing of Tactile Shape in the Human Brain
TL;DR: It is suggested that somatosensory representations of shape are computed by areas 3b, 1, 2, IPA, and ASM in this hierarchical fashion.