01:830:301 Lecture Notes - Lecture 19: Haptic Perception, Body Image, Agnosia
4 May 2016
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Document Summary
People can detect a bump only 1 micrometer high at 75% accuracy. Dot triggers fa i receptors, which also help detect slippage of objects while being grasped. Surface with many dots a fraction of a micrometer high can be detected when moved across the skin via fa ii receptors deep in skin. 2-point threshold- the minimum distance at which 2 stimuli are just perceptible as separate. Spatial acuity varies across the body (fingertips, face, and toes show the highest acuity) 2 tactile pulses can be delivered over time, in a manner analogous to spatially separated 2-point threshold stimuli. Touch- sensitive to time differences of only 5ms. Vision- sensitive to time differences of 25ms. Audition- sensitive to time differences of 0. 01ms. Haptic perception- knowledge of the world that is derived from sensory receptors in skin, muscles, tendons, and joints, usually involving active exploration: perception for action- holding and moving an object. Need to perceive to move a water bottle.
