PSY 241 Lecture 11

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PSY 241 Lecture 11
2013-03-12 22:04:52
psychobiology zavala

Vision 2
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  1. Magnocellular
    • 2 inner layers (1,2)
    • Larger receptive fields in the retina (i.e. input is coming from cells throughout the retina)
    • Not sensitive to color and respons strongly to moving stimuli, and to large overall patterns but not details (rods)
  2. Parvocellular
    • Outer 4 layers (3,4,5,6)
    • Small receptive fields in the retina, mostly from in and near the FOVEA
    • Specialize in visual detail (form) and color (color sensitive) (Cones)
  3. Simple Cells of Striate Cortex
    One simple cell receives input from many ganglion cells
  4. Complex cells of Striate Cortex
    One complex cell receives input from many simple cells
  5. Dorsal Stream
    • Where pathway
    • receives mostly magnocellular input from LGN
    • straite cortex to posterior parietal lobe
    • activated by moving objects
    • provides info about where an object is
  6. Ventral Stream
    • What pathway
    • receives equal parvo/magnocellular input from LGN
    • striate cortex to inferior temporal lobe
    • activated by static images (non-moving images)
    • provides info about what an object is
  7. Object Agnosia
    • agnosia = failure to know
    • inability to perceive objects¬†
    • perceive image of a man
    • unable to recognize that the "man" is compromised of vegetables and flower
  8. Prosopganosia
    • prospon = face
    • inability to recognize faces
    • perceive the vegetables and flowers
    • unable to recognize the image of a man's face
  9. Akinetopsia
    • damage to V5
    • inability to perceive movement
    • can see change in position
  10. Balint's Syndrome
    Damage to parieto-occipital region
  11. optic ataxia
    • ataxia = "disorderly"
    • visually difficult to reach for objects
    • may see, recognize object, but movement is usually misdirected
  12. ocular apraxia
    • without visual action
    • difficulty in visual scanning
    • not able to maintain fixation on an object
    • eyes will begin to wander to another object
  13. simultanagnosia
    not able to perceive more than one object
  14. visual neglect
    neglecting events in the visual field
  15. Blindsight
    the ability of an individual to respond to objects in a missing visual field without being conscious of seeing anything
  16. Primary Cortex
    input from thalamus
  17. Secondary Cortex
    input from primary and other secondary cortex area within the same sensory system
  18. Association
    input from more than one sensory system (usually secondary cortex)
  19. Flow of information
    • Receptors
    • Thalamic relay nuclei
    • Primary sensory cortex
    • Secondary sensory cortex
    • Association cortex