Cell Bio 2 Exam 2 L25: Neural Plasticity Finale

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Author:
jly518
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207580
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Cell Bio 2 Exam 2 L25: Neural Plasticity Finale
Updated:
2013-03-16 00:56:16
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BIOE 1071 Cell Bio
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  1. Retina
    -light activates cells

    • -"simple" processing occurs (contrast) 
    •        *adjacent light/dark regions (edges and spots)
  2. Optic Chiasm
    information exchanged between sides
  3. Superior Culliculus (tectum)
    • small region of the midbrain
    • integration area (visual, auditory, muscular,...)
  4. Visual Cortex
    • Rear part of the cortex
    • Higher order processing
    • Visual representations and memories
  5. Where does mapping phenomenon occur?
    In the superior colliculus
  6. mapping phenomenon integrates activity
    retinal activity correlated with ____ and ____
    auditory sensation and skeletal position
  7. visual map
    • superior colliculus neurons correspond to retinal activity (the recepetive field)
    • activity is the most prominent in the center of the field
  8. auditory map
    superior colliculus neurons correspond to auditory wave interference (receptive field in auditory space instead of visual)

    • center of the auditory receptive field corresponds to 0 us time difference
    •       *noise takes the same time to reach each ear
    •       *movement to one side or the other corresponds to a delay in reaching the farther ear

    noise reaches ears at difference times denoting location
  9. Owl Example
    when an owl hears a sound it looks directly at it

    prisms on the eyes shifted vision to the left 23 degrees

    a naive animal hears the sound, looks forward, but sees the object to the left

    a learned animal knows how to turn its head and eyes to properly align the visual and auditory field

    in an owl the critical period is 200 days, if the prisms are removed before then it recovers, if theyre removed after it doesn't

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