PSY290H1 : psy290 lecs 5 (Chp7).pdf
Document Summary
2012-11-13 7:45 pm: process where physical/chemical stimuli from external env/body are transformed into neural signals (ap, brain processes info about properties of stimuli. 3 steps of sensation: 1. stimuli are captured by specialized cells, sensory receptor cells. Distinct sensory receptor cells for each sensory system. Have specialized structures & functions for sensory stimuli: transduction, captured signals are transformed into neural signal (ap) Selective ion channels open results in changing membrane potential if integrated effect of local potential is large enough. Stimuli triggers ap in sensory receptor cell: neural signals passed to cns, sensory neurons from sensory organs: Sensory receptor cells: distinct for each sensory system, sensitive to specific sensory stimuli, have specialized structures & functions for diff sensory stimuli, axons of sensory receptor cells project to cns. Ex. lateral geniculate nucleus -> striate cortex. Primary & secondary sensory cortex of same system -> Secondary sensory cortex: more than 1 sensory system (mostly secondary sensory cortex) -> association.
