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20 Cards in this Set
- Front
- Back
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What is the lateral geniculate nucleus (LGNs)?
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Located in the thalamus and receives input from the retinal ganglion cells and has inputs and outputs connections to the visual cortex
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What are the magnocellular layers?
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the larger neurons located in the bottom 2 layers of the LGN
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What is the parvocellular layer?
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The smaller 4 layers of neurons in the LGN
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Where does the magnocellular layer receive input from?
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parasol ganglion cells
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Where does the parvocellular layer receive input from?
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midget ganglion cells
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What do the magnocellular layers respond to?
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large, fast moving objects
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What does the parvocellular layers respond do?
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process details of stationary targets
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What kind of maping does our visual field use?
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topographic
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What part of the brain is responsible for processing visual input
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primary visual cortex or VI
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What is orientation tuning?
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the tendency of neurons to respond optimally to certain orientations
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What are simple cells?
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cells with clearly defined excitatory and inhabitory regions
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What are complex cells?
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cells whose receptive-field characteristics cannot be easily predicted
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What is end stopping and which cells contain this property?
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Its the process by which firing increases as a bar length increases and fills the receptive field and firing decreases as the bar lengthens past the receptive field. Striate cortex cells have this property.
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All preferences for certain orientations can be found in ___ of a column
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.5mm
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Each section of the cortex is a ________________
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hypercolumn
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What is a hypercolumn?
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A 1mm block of striate cortex that contains every preference responsible for the visual world
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What is the tilt aftereffect?
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the illusion of tilting from adaption to a pattern of a given orientation
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What is faurier analysis?
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breaking down complex pattern into sine waves
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Neurons that respond te same way are call....
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channels
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What are sine waves?
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stripes with fuzzy edges
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