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

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