Psych312_Week3Lecture2_Anatomy&Physiology.pdf

Psych312_Week3Lecture2_Anatomy&Physiology.pdf - Anatomy...

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Anatomy and Physiology of Vision (continued)
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Announcements Exam #1 next Thursday (2/1) Multiple choice (bring a pencil) and short answer ~50 MC questions and ~15 points from short answer Covers all material weeks 1-4 Review sheet and sample exam questions posted on Canvas Extra credit opportunity (due by 9AM Tuesday,1/30) Write up to 2 multiple choice exam questions (A,B,C,D) Post to Canvas as assignment Each question adds 1% to your exam grade (2% max) Exam #1 grade: 88% + 2% = 90%
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Outline Electrophysiology of vision Pathways out of the retina Lateral geniculate nucleus (LGN) Primary visual cortex (V1) Beyond primary visual cortex
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Receptive field Region of the retina that influences the activity of the neuron of interest (the one being recorded from)
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Excitatory input only Inhibitory input only Excitatory and inhibitory input Excitatory and inhibitory connections Excitatory and inhibitory connections
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Center-surround organization Lateral inhibition: Inhibition that spreads laterally across a neural circuit Lateral inhibition creates “center-surround” ganglion cells excitation inhibition inhibition + + + + + + + - - Photoreceptors Bipolar or ganglion cell
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Center-surround organization 100 + + + + + + - - + 100 100 Firing rate of “B” 200 300 400
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Center-surround organization 100 + + + + + + - - + 300 100 100 100 Firing rate of “B” 200 300 400
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Center-surround organization 100 + + + + + + - - + 100 100 100 100 100 100 100 100 Firing rate of “B” 200 300 400
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Center-surround organization 100 + + + + + + - - + -100 100 100 100 100 200 200 100 100 100 Firing rate of “B” 200 300 400
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