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Definition
| A specialized neuron that detects a particular category of physical events |
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Definition
| The process that transfers sensory stimuli into graded membrane potentials |
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Definition
| Determined by intensity of electromagnetic radiation |
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| Determined by purity of the light wave |
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Definition
| A protein dye responsible for the transduction of visual info |
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Term
| What are the two parts that make up a photopigment? |
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Definition
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Definition
| The portion of the visual field where the presentation of visual stimuli change the firing rate of a particular neuron |
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| What is the receptive field of a particular neuron determined by? |
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Definition
| The location of the photoreceptors that provide it with info |
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| What are the 3 types of ganglion cells, and what do they do? |
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Definition
ON: respond to retinal illumination
OFF: respond to darkness
ON/OFF: respond to changes in illumination |
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Definition
| Red and green cones are confused - both look yellowish |
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Term
| Opponent-color processing |
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Definition
| Retinal ganglion cells respond to pairs of colors: red/green and blue/yellow |
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Definition
| Coordinates head and eye movement; controls low-level attention to visual stimuli; regulates size of pupils; receives input from ON/OFF cells |
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Term
| David Hubel & Torsten Wiesel |
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Definition
| Discovered that visual neurons don't only respond to light, but other specific features of the world (Orientation/movement, color, brightness, etc) |
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| What are the 3 types of orientation & movement cells? |
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Definition
| Simple, complex, hypercomplex |
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Term
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Definition
Excited: stimulus in center
Inhibited: stimulus moved from center |
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Definition
Excited: stimulus in center
-Not inhibited if placed in surrounding area |
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Definition
Excited: stimulus in center
Inhibited: stimulus on borders |
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Definition
| Hold color info in visual cortex |
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Takes info to temporal lobe
-color, object recognition |
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Definition
Sends info to the parietal lobe
-controls acting on visual info-puts info in 3D form |
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Definition
| The inability to discriminate b/w hues |
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Definition
| The inability to perceive/identify a stimulus |
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Definition
| The inability to recognize faces |
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| Associative visual agnosia |
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Definition
| The inability to identify objects, even though the form of the object can be drawn or matched w/ similar objects |
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Definition
| Area of the brain that is involved in the perception of faces |
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Definition
| The inability to perceive movement |
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