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BIOLOGY 2C03 (138)
Kim Dej (45)
Lecture

Visual System II

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Department
Biology
Course
BIOLOGY 2C03
Professor
Kim Dej
Semester
Fall

Description
Outline of Lecture 64 (03-26 B; Connor) Visual System II – Ventral Pathway (Shape and Color) I. Introduction to the ventral pathway - The ventral pathway processes shape and color - It is composed of V1, V2, V4, (V8), and inferotemporal regions (ant., post., central) - Other miscellaneous regions - Lateral occipital (LO): object/shape - Fusiform face area (FFA): face stimuli or complex shape stimuli - Parahippocampal place area (PPA): landscapes and building interiors - Extrastriate body area (EBA): bodies and body parts II. V1: simple orientation tuning - V1 cells are tuned to the orientation of lines/edges - Simple cells: tuned to orientation, position variant - Have on/off receptive fields structured to recognize edges, perhaps as a result of convergent input of multiple LGN cells whose receptive fields are aligned - Complex cells: also tuned to orientation, but position invariant - This property may be a result of convergent input of multiple simple cells - Hypercomplex cells: added property of end-stopping (tuned to short lines) - Columnar organization: each column is orientation tuned, and exact orientation shifts gradually from column to colum
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