Monday, February 6, 2012

370: From the Eye to the Brain Pt2, Primary Visual Cortex Pt1

  1. Receptive Fields Review
  2. LGN
    1. The cell bodies in layers 1&2 are larger than the cell bodies in layers 3-6
    2. 1&2 get their information from rods
    3. Layers 3-6 get a lot of their information from cones
    4. Retinotopic Map
      1. receptive fields for cell 1 and cell 2 will be right next to each other and you can build an entire map of the retina on the LGN layers (or something like that.  It's a little confusing)
      2. Adjacent cells on the retina line up with adjacent cells on the LGN
    5. Optic Radiations
  3. Primary Visual Cortex (Area VI) (Occasionally called area 17, or striate cortex)
    1. First cortical area for visual processing
    2. 6 Layered structure
    3. Organization
      1. Retinotopic Map
      2. Orientation Columns
      3. Cortical Magnification
      4. Color blobs
      5. Ocular Dominance Columns
    4. VI Receptive Field Properties
      1. Simple cortical cells: respond best to bar of light oriented along the length of the receptive field (LGN)
      2. Complex Cortical Cells
        1. End-stopped: bar must not exceed a given length for maximum response
        2. Motion sensitive: bar must move in a particular direction for max response
        3. Many other types...
      3. Lines and Edges
        1. Edges are super important... yep

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