BIOL373 Lecture Notes - Lecture 5: Postcentral Gyrus, Primary Motor Cortex, Central Sulcus
2 Sep 2019
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Document Summary
Special senses" have devoted regions: visual cortex, auditory cortex, olfactory cortex, gustatory cortex, neural pathways extend from sensory areas to association areas, which integrate stimuli into perception. Stimulus processing usually conscious: vision touch, hearing temperature, taste pain, smell itch, equilibrium proprioception. Receptors can be grouped according to type of stimulus: chemoreceptors, oxygen, ph, various organic molecules such as glucose, mechanoreceptors, pressure (baroreceptors), cell stretch (osmoreceptors), vibration, acceleration, sound, photoreceptors, photons of light, thermoreceptors, varying degrees of heat. Na or ca depolarization: sometimes: efflux of k , change in membrane potential (graded potential) = hyperpolarization receptor potential. Neurons often overlap: several primary neurons converge onto a secondary neuron, convergence allows summation of multiple stimuli, creates larger receptive fields. Discrimination: two stimuli fall within same secondary receptive field only one signal goes to brain. Discrimination: the two stimuli activate separate brain, the two points are perceived as.
