PSYB51H3 Lecture Notes - Lecture 11: Cutaneous Rabbit Illusion, Dorsal Root Ganglion, Spinothalamic Tract
Document Summary
Touch: mechanical displacements and other physical impacts on the skin. Somatosensation: a collective term for sensory signals from the body. => subtracting (less interesting) sensation of the pen to tell what you are touching tell consistency indirectly tell what it is. During which the stimulus is in contact with its rf. Fa i: skin slip; low-frequency vibration (3-40 hz) hold cup of coffee and know how much grip force to use. Fa ii: first contact with objects: high frequency vibration (50-700 hz) nerve ending embedded absorb mechanical forces = immediate impact when stimulated and fast adaptation. Sa i: fine spatial details, textures, patterns, braille; sustained pressure, spatial deformations (<5 hz) Sa ii: lateral stretch (e. g. , grasping), hand shape; low sensitivity to vibration. Vibrator on the biceps stimulates muscle spindles; creates illusion that muscle is longer than it is. Stimulating the triceps is the opposite of biceps illusion that muscle is shorter. How we move and place limbs is the importance.
