15vision(NXPowerLite) W09

15vision(NXPowerLite) W09 - Vision A. Anatomy of visual...

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Unformatted text preview: Vision A. Anatomy of visual pathway B. Response properties of neurons at various levels of the pathway. C. Modularity. D. What we see is not what is out there. 1. Reconstruction based on evidence. 2. "Pure" construction E. Neural correlates of conscious visual experience MT (inner surface of temporal lobe) Parietal visual area MT (inner surface of temporal lobe) Parietal visual area MT (inner surface of temporal lobe) Parietal visual area Dorsal stream : Movement and location Ventral stream : Form and color Optic tract fibers affected by stim Location on retina stimulated Dark spot Bright spot On (center) cell Off (center) cell Topographic (retinotopic) mapping time One dual-purpose cell, low spont rate One dual-purpose cell, high spont rate Separate bright and dark cells Location on retina stimulated V1 Optic nerve The firing of this cell says "There is a dark spot nearthe center of the retina." V1 The firing of this cell ]says "there is a line oriented about 15 degrees from horizontal near the center of the retina" Retina V1 Retina Lateral geniculate V1 Retina Lateral geniculate V1 Without backward projection With Each cell tested on each of ~90 stimuli. Histogram gives average number of stimuli (per cell) that caused the spike rate on the x axis. Typical responses Familiar Unfamiliar Familiar Unfamiliar No cell responds with > 3 spikes/sec to any of 45 unfamiliar stimuli . On average a given cell cell respond at > 3 spikes/sec to one or occasionally two of 45 familiar stimuli Close friends Unknowns Eyes Noses Eyes Noses Thrsh=2 Thrsh=2 Thrsh=2 Thrsh=1 Sense of familiarity Sense of familiarity Vision A. Anatomy of visual pathway B. Response properties of neurons at various levels of the pathway. C. Modularity. D. What we see is not what is out there. 1. Reconstruction based on evidence. 2. "Pure" construction E. Neural correlates of conscious visual experience MT (inner surface of temporal lobe) Parietal visual area Dorsal stream : Movement and location Ventral stream : Form and color Pre Post MT Lesion % correlated needed to see motion 100 10 1 Ventral stream damage has no such effects, but does hurt color and form vision Direction...
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This note was uploaded on 03/29/2011 for the course PSYCH Psych15A taught by Professor A during the Winter '09 term at UCLA.

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15vision(NXPowerLite) W09 - Vision A. Anatomy of visual...

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