PSC 101 Study Guide - Midterm Guide: Cochlear Nucleus, Cerebellum, Inferior Temporal Gyrus
28 Aug 2018
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Autoradiography- radiation to look at receptors you"re interested in, ct scans more like x-rays; mris have more resolution. Striate cortex important for color processing: visual sensation, photoreceptors don"t fire action potentials, action potential fired from ganglion cell. In the dark sodium channels are open (na+ comes in: when light comes in the rhedopsin is stimulated activating g-coupled protein, this activates phosphodiesterase reducing concentration of cyclic gmp, leads to hyperpolarization. Light comes in through the back of the retina: hits photoreceptors first then through bipolar cells to ganglia, very specific simple cells respond to lines of specific levels and complex cells respond to. In surround when light shines the on region activated so more action potential and firing. If light focused on-center leads to action potential. Line and indirect line: negative positive stuff, thalamus is inhibited so cortex isn"t constantly excited, to have controlled movement stimulate direct pathway and get disinhibition of the thalamus.
