Section2-5-1 - 2/21/12 What is the most sensitive area of...

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2/21/12 1 Psychophysical aspects of touch • Sensitivity • Threshold for feeling • Localization and Discrimination • Accuracy of locating stimulus and two point discrimination What is the most sensitive area of your body to touch? Tactile Sensitivity and Acuity How Fnely can we resolve spatial details? – Two-point threshold: The minimum distance at which two stimuli are just perceptible as separate – Like sensitivity to pressure, spatial acuity varies across the body • Extremities (Fngertips, face, and toes) show the highest acuity Two-Point discrimination Which area of your body is best for Braille? Two-Point discrimination: need many small receptive Felds Large amount of cortex devoted to info from Fngers, and they have small receptive Felds : ideal for detailed perceptions. MUSCLES AND TENDONS ARE SENSORY ORGANS TOO! Kinesthesis/proprioception
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2/21/12 2 Defnitions • Kinesthesis: The perception oF the position and movement oF our limbs in space • Proprioception: Perception mediated by
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Section2-5-1 - 2/21/12 What is the most sensitive area of...

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