Section4-2 - 4/5/12 Hypercolumns: Systematic organization...

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4/5/12 1 Hubel and Wiesel Orientation Columns : Bar-shaped receptive felds oF diFFerent orientations (angles) Occular Dominance Columns : Best response to L or R eye Hypercolumns : Systematic organization oF receptive felds in cortex One Hypercolumn: All orientations and 1 pair oF occular dominance columns representing one place in visual space Classic depiction of Hypercolumn 2-Deoxy-glucose method (2-DG) Normal amount oF activity to vertical line across population oF cells Normal amount oF activity to vertical line across population oF cells
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4/5/12 2 You are fatiguing (adapting) neurons with this orientation Cells closer to adapting stimulus are now less active to vertical stimulus Peak activity is no longer in the vertical cells Lateral connections (Horizontal and Amacrine cells) So, Ganglion cell activity is inFuence by more than one receptor cell Lateral Inhibition : Input from neighbors is inhibitory Contrast and the value of having Center-Surround receptive ±elds + No light,
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This note was uploaded on 04/09/2012 for the course EXP 3202 taught by Professor Staff during the Spring '12 term at Florida State College.

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Section4-2 - 4/5/12 Hypercolumns: Systematic organization...

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