PSY290H1 Lecture Notes - Lecture 5: Superior Colliculus, Blood Vessel, Bulbous Corpuscle
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Visio(cid:374) (cid:894)(cid:449)o(cid:374)"t (cid:271)e (cid:272)o(cid:448)ered, taught i(cid:374) (cid:1006)8(cid:1004)(cid:895) Sensation: the process where physical or chemical stimuli from the external environment or from the body itself are transformed into neural signals (action potentials) The brain then process the neural signals to understand (perceive) the stimuli. Visual sensation (seeing a pencil) vs. visual perception (recognizing it) Stimuli are captured by specialized cells: sensory receptor cells, except in somatosensation. Sensory receptors are: have specialized structures and function for different sensory stimuli: nerve endings serve as sensory receptors in somatosensation. Very similar to the generation of the psp by nt receptor: stimulation of sensory receptor cells by physical or chemical stimuli causes selective ion channels to open, results in changes in membrane potential. If the integrated effect of local potentials is large enough, sensory stimuli trigger aps in sensory receptor cells or nerve endings: same rules of temporal and spatial summation apply. Step 3: neural signals are passed to the cns.
