PSYB65H3 Chapter Notes - Chapter 9: Retinal Ganglion Cell, Optic Disc, Optic Chiasm
Document Summary
After sensory energy has been transduced-> info goes to all sensory systems action potential-> travel along peripheral nerves in somatic nervous system-> spinal cord or brain: travel on nerve tracts in the cns. Presence of a stimulus-> inc and dec in neuron discharge rate-> inc and dec encode stimulus intensity. Each sensory system has a preferential link with certain reflexive movement: pain -> withdrawal responses. Synesthesia: hear color or smells sound: mixing of senses. Neo(cid:272)orte(cid:454) represe(cid:374)t the se(cid:374)sor(cid:455) field for all se(cid:374)sor(cid:455) s(cid:455)ste(cid:373)s; visio(cid:374) . Sensory impressions are affected by location, emotion state of the stimulus. Light-> pupils-> strike a light sensitive surface; retina. Retina consist of photoreceptors beneath a layer of neurons connected to them. Photoreceptors and retinal neuron= light into action potentials: discriminate wavelengths- distinguish color. Centre of the visual field- most cones and photoreceptors. Visible light and the structure of the eye. Visual system analyzes visible light- part of the electromagnetic spectrum that we can perceive.
