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16 Cards in this Set
- Front
- Back
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Optic Nerve
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transmits visual information from the retina to the brain. ( primary visual cortex)
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Optic Chiasma
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Where optic nerves from each eye cross over.
- Things seen on the right are processed in the left side of the brain and vice versa. - Left side of both eyes goes to the right side of the brain; right side of both eyes goes to the left side of the brain. |
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P Zone of the Lateral Geniculate Body
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Midget Layers- Parvo Cells ( parvo means small)
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M Zone of the Lateral Geniculate Body
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Parasol Layers- Magno cells ( magno means big)
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K layers in the lateral geniculate body
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receive input from ganglion cells that encode blue s cones
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Temporal contrast sensitivity
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This measures the sensitivity of detecting a change in changing spatial pattern in time.
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Color contrast sensitivity
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sensitivity to changes in color are measured. There is no change in intensity on this function.
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What would happen if the P zone ( midget cells) of LGN were removed?
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Spatial detection: your ability to see spatial patterns drop by more than a factor of ten.
Means: midget cells carry spatial info. Color Detection: ability to see red/green color patterns is completely lost. Means: midget cells carry all color info & the M xone doesn't carry any. |
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What would happen if the M zone (parasol cells) of LGN were removed?
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Temporal: sensitivity here is lost.
Means: parasol cells detect temporal contrast. Carry info for detection of rapidly changing things. |
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First people to record neurons from primary visual cortex.
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Weisel and Hubel
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Why ais it difficult to detect the neural signals of cortical neurons( primary visual cortex neurons)?
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- These neurons generate only 1/2 an action potential per second.
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What differences did Weisel and Hubel find for the receptive field of neurons in the primary visual cortex?
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- not centered; striped or elongated
- direction selective - orientation selective - position/ phase selective - size selective - low spontaneous activity ( quiet) |
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Complex cells
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cells that canot use specific maps to tell what they can detect. These cells can have multiple properties of detection such as position selection or direction selection or some of them combined.
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Simple Cortical Cell Theory
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Theory that simple cortical cells are made up of LGN cells that have their own receptive fields and the combination of these fields make up the receptive field of the Cortical cell.
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Complex Cortical Cell Theory
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Theory that complex cells are made up of receptive fields of multiple simple cortical cells which are made up of receptive fields of LGN cells and these all combined make up the receptive field of the complex cell.
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What are the two types of orientation selectivity in complex cortical cells?
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Perpendicular:
Parallel: |
