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lecture 5A: Vision
| Question | Answer |
|---|---|
| cornea | transparent layer in front of the eye |
| Lens | Focuses the image in the back of the eye |
| Retina | light sensitive tissue that lines the back of the eye |
| Fovea | Point of central focus |
| Photoreceptors | cells that line the retina responsible for visual transduction where light (photons) are turned into action potentials |
| Pupil | opening in the eye |
| Iris | group of muscles that control the size of the pupil |
| Rods | sensitive to low levels of light, more importantly contrast |
| Cones | discriminate between colors, responsible for detail |
| Transduction | Transformation of physical signal into an electrochemical one |
| Photopigments | Indirectly causes channels to open when light hits the photopigment |
| Lateral inhibition | stimulation of one cell will lead to inhibition in a neighboring cell |
| Horizontal cell | responsible for lateral inhibition |
| Bipolar/ganglion cells | connect to optic nerve |
| Bright physical stimulus | fires a lot |
| Gray physical stimulus | fires less |
| Convergence | pooling of information from cones and rods onto ganglion cells |
| Trichromacy | three "primary" colors |
| Dichromat | only see in two colors |
| Monochromat | only see in black and white |
| Opponent process theory | one type of receptor wll be stimulated vs others |
| Visual pathway | process of eye to the brain |
| Optic nerve | projection from the retina |
| Primary visual cortex (V1) | direct conscious perception and vision |
| Optic chiasm | crossing point to optic nerve |
| Optic radiations | run from the chiasm to the LGN |
| Lateral Geniculate Nucleus | subdivision of the thalamus responsible for processing visual information |
| Parvocellular | small cells process info of color in detail (cones) |
| Magnocellular | larger cells that are fast and focused on contrast (rods) |
Created by:
Rianagrani
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