torsten weisel
DESCRIPTION
Major discoveries Cell types in V1 Functional organization of V1 (Maps and columns). Torsten Weisel. David Hubel. Direction selective cells. Monocular left eye. {. Dominated by left eye. Equal dominance. {. Dominated by right eye. Monocular right eye. Fitzpatrick. - PowerPoint PPT PresentationTRANSCRIPT
Torsten Weisel
David Hubel
Major discoveries• Cell types in V1• Functional organization of V1 (Maps and
columns)
Direction selective cells
Response Properties of V1 Neurons Simple cells: 1. Low spontaneous activity (quiet when not stimulated). 2. Receptive fields are elongated (not circular) and are also divided into excitatory (+) and inhibitory (-) regions. 3. The (+) and (-) regions do not form a center and a surround but form alternating stripes (rectangular regions) -- edge detectors, slit detectors, line detectors. 4. They are position (or phase) selective. 5. They are orientation selective. 6. They are size selective. 7. They are often direction selective. 8. They are often disparity selective.
Response Properties of V1 Neurons Complex cells: 1. Low spontaneous activity (quiet when not stimulated). 2. Receptive fields are elongated (not circular). 3. Do not form a center and a surround rather they behave like edge detectors, slit detectors, or line detectors. 4. They are not selective to position (or phase). 5. They are orientation selective. 6. They are size selective. 7. They are often direction selective. 8. They are often disparity selective.
Monocular left eye
Monocular right eye
Equal dominance{{Dominated by left eye
Dominated by right eye
Fitzpatrick
Cytochrome oxidase blobs
(at locations of cytochrome oxidase blobs)