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class+17+lecture+_Iriki_ - Sensation and Perception Class...

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Sensation and Perception Class XVI: Touch (cont.) & Iriki et al. 1996
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Haptic Perception The What system of touch: Geometric properties of objects are most important for visual recognition. Material properties of objects are crucial for haptic recognition Two-dimensional pictures of objects are recognized easily visually but poorly haptically
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Haptic Perception Tactile agnosia : The inability to identify objects by touch Caused by lesions to the parietal lobe Patient documented by Reed and Caselli (1994): Tactile agnosia with right hand but not left hand Could not recognize objects such as a key chain in right hand, but could with left hand or visually Rules out a general loss of knowledge about objects Other sensory abilities were normal in both hands
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Haptic Perception The Where system of touch: Knowing where objects are in the environment when only using touch perception Example: Finding snooze button on alarm clock in the morning Frame of reference : The coordinate system used to define locations in space Egocenter : The center of a reference frame used to represent locations relative to the body.
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class+17+lecture+_Iriki_ - Sensation and Perception Class...

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