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10 Cards in this Set
- Front
- Back
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Objective
Give a brief overview of the mammalian visual system. |
See study guide.
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Objective
Describe the phenomenon of lateral inhibition. |
It is the reduction of activity in one neuron by activity in neighboring neurons.
Main Function: Heighten the contrasts When light falls on a surface, the bipolar cells (which are connected to horizontal cells) just inside the borders are excited, and those outside the border are least responsive. |
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Objective
Compare the receptive fields and connections of parvocellular, magnocellular, and koniocellular neurons. |
See study guide.
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horizontal cell
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Neuron in the retina that connects with photoreceptors (rods and cones) and the outer processes of bipolar cells.
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laterial geniculate neucleus
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A nucleus of the thalamus specialized for visual perception.
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lateral inhibition
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The reduction of activity in one neuron by activity in neighboring neurons
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receptive field
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The part of the visual field that excites or inhibits a neuron
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parvocellular neuron
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Types of ganglion cell with small cell bodies and small receptive fields
Located mostly in or near the fovea Responsive to color and involved in the detailed analysis of stationary objects |
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magnocellular neuron
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Type of ganglion cell with larger cell bodies and receptive fields
Distributed fairly throughout the retina Responsive to movement and broad outlines of shape, but not to color |
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koniocellular neuron
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Type of ganglion cell with small cell bodies, similar to the parvocellular neuron
Occur throughout the retina instead of being clustered near the fovea Some are responsive to color, but their functions are varied and not yet fully described |
