neuro3 - Neuroscience 3 Dr Keele ← Exam 2 posted by 5pm...

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Unformatted text preview: Neuroscience 3 Dr. Keele ← Exam 2 posted by 5pm Thursday. Review with Dr. DG by Oct. 19 ← Exam 3 is Nov. 2 ← Sensory and perceptual experience ← Ch. 6.1-6.4 ← Ch. 7.1, 7.2, 7.6 ← Emotion and mental illness ← Ch 17 & 18 ← ← peripheral mechanisms ← signal detection ← signal conversion • transduction and transmission ← central (cognitive) mechanisms ← modification • higher-order analysis ← interpretation ← 4 things signals have to do: detection, conversion, modification, interpretation. ← Consciousness is unitary. ← The binding problem • The problem of how the unity of conscious perception is brought about by distributed activities on the CNS ← 10/17/07 ← transduction by rhodopsin- signal transduction ← transduction- converting energy from one form to another. ← Rhodopsin absorbs light and bleaches. ← Bleaching of rhodopsin causes rods to hyperpolarize. ← “rhod-“ means red ← bleaching comes from light that causes hyper polarization. ← Visual pathways • Retina-geniculate-striate pathway o Retina o Lateral geniculate nucleus (LGN) of the thalamus o Primary visual (striate) cortex Other pathways • Superior colliculus • Hypothalamus o Suprachiasmic nucleus ← Striate and primary visual cortex in occipital lobe. ← Retina-geniculate-striate pathway • ½ of retinal ganglion nerves cross the midline at the optic chiasm (chiasm=cross) o retinal ganglion cell axons from the nasal hemi-retina decussate (cross) on their way to LGN (midline) o ganglion neurons from the temporal hemi-retina remain ipsilateral (lateral) • visual space is represented in the contralateral cortex. ← Closer to midline, the more likely they are to cross. ← Retinotopic organization- “retina map” ← Retina-geniculate-striate pathway • 2 independent channels o M channel- big, movement (magno) • P channel- small, color, fine detail (parvo) ← Contrast and lateral inhibition: a model for the neural basis of perception Contrast: the perception of edges • Perceiving edges= detecting changes in contrast o Brightness contrast ← Mach bands • Are non-existent stripes of darkness and brightness located at edges • Enhance the contrast from one side of the edge to the other • Makes edges easier to see • Arise from LATERAL INHIBITION Visual system II Mammalian visual system • Mapping receptive fields • Cell types o On center/ off-center cells-have monocular receptive fields that are circulate, on-firing, off-firing. Feed into simple cells o Simple cells- rectangular bars, on firing off firing, sensitive to location and orientation. Feed into complex cells o Complex cells- binocular • Model of striate cortex o Hubel & wiesel...
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This note was uploaded on 04/15/2008 for the course NEUROSCI 1306 taught by Professor Granados,keele,weaver,patton during the Spring '08 term at Baylor.

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neuro3 - Neuroscience 3 Dr Keele ← Exam 2 posted by 5pm...

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