PSYB51H3 Lecture Notes - Lecture 11: Substantia Gelatinosa Of Rolando, Lamellar Corpuscle, Ventral Posterior Nucleus
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: 2 separate locaation stimulated multiple times in quick succession feels like a rabbit, hopping across the skin b/w the 2 locations, investigated with fmri. Middle location equally activated as stimulated locations. Touch physiology: touch receptors: embedded in outer layer (epidermis) and underlying layer (dermis) Touch receptors (& other somatosensory receptors) have three attributes: type of stimulation the receptor responds to, size of the receptive field, rate of adaptation, tactile receptors (four): mechanoreceptorsrespond to mechanical stimulation or pressure. Sensory receptors that signal information about changes in skin temperature. Thermoreceptors kick into gear when you make contactwith object warmer or colder than your skin: nociceptors: Sensory receptors that transmit information about noxious stimulation that causes damage or potential damage to the skin. A-delta fibers: strong pressure, heat; myelinated --> fast.
