PS102 Lecture Notes - Lecture 5: Depth Perception, Subjective Constancy, Visual Cortex
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Seeing in colour: light=electromagnetic radiation, brightness (amplitude, hue perception of colour (wavelength, saturation: purity of colour (amplitude and wavelength) Whats wrong with trichromatic theory: trichromatic theory cannot explain, red-green colour blind individuals should not be able to perceive yellow (red+green=yellow, afterimages, stare at red- look a(cid:449)a(cid:455) (cid:455)ou"ll see gree(cid:374) (cid:894)sa(cid:373)e for (cid:271)lue a(cid:374)d (cid:455)ello(cid:449)(cid:895) Theories of colour: opponent-process theory (hering, 1870, colour pairs work to inhibit one another, 3 cone types. Each type responds to 2 different wavelenghs. Current view of colour vision: dual process theory: combines trichromatic & opponent-process theories. Ask a psychologist: are dogs colour blind, simple answer- no, complex- they see differently than humans, they are dichromatic (blue and yellow) fewer cone sells in retina, more rod cells. Vision and the brain the optic nerve carries messages from each eye (visual field) to the visual cortex (occipital lobe)
