PS102 Lecture Notes - Lecture 4: Occipital Lobe, Temporal Lobe, Visual Cortex
Document Summary
Opponent-process theory (hering, 1870: 3 colour pairs work to inhibit one another, 3 cones types: Each type responds to two different wavelengths. Explains afterimages: stare at certain colour, neural processes become fatigued, have "rebound" effect with receptor responding with its opponent opposite reaction, by fatiguing the cone, the other cones are activated. Retinal ganglion cells: project information from the retina to the brain via the optic nerve, are arranged in opposing cells: red-green, yellow-blue, black-white. Support for this theory - we cannot see mixes of certain colors: reddish green or bluish yellow. There is a blind spot in the retina where we see nothing is where the optic nerve starts: give the information about the vision cortex to brain in the occipital lobe. Combines trichromatic and opponent-process theories: cones are sensitive to different wavelengths, short wave - blue, medium wave - green, long wave - red.
