| A | B |
|---|
| feature detectors | neurons in the visual cortex that receive visual information and respond to certain features such as lines, angles, movements |
| fovea | a small depression in the retina of the eye where visual sharpness is highest. The center of the field of vision (“straight-on vision”) is focused in this region, where retinal cones are particularly concentrated. |
| blind spot | the small circular area at the back of the retina where the optic nerve enters the eyeball and which is devoid of rods and cones and is not sensitive to light. |
| Trichromatic theory | indicates that we can receive 3 types of colors (red, green, and blue) and that the cones vary the ratio of neural activity (Like a projection T.V.) |
| dichromatic color blindness | cannot see either red/green shades or blue/yellow shades (1% of males) |
| monochromatic color blindness | see only shades of gray (1 in 100,000 people) |
| Opponent-Process Theory | suggests that looking at one color for a long period causes those receptor cells to become fatigued. When you look away, you see another color. |
| Top-down processing | occurs when we look at something and our previous knowledge or expectations influence how we perceive what we are looking at; our experiences and expectations fill in the gaps |
| illusion | due to top-down processing, We THINK we see something that isn’t there. |
