PSYO 1021 Lecture Notes - Lecture 11: Trichromacy, Visual System, Dichromacy

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Red pigment absorbs blue and green wavelengths of light. Each cone is mostly sensitive to red, blue or green. Visual system combines this red blue green input. The 7. 5 million hues we see are combinations: additive colour mixture, white = all equally activated. Problem 1: people with red-green colour blindness can still see. Cones are linked in three opposing colour pairs. Signals from the cones have an opposing effect on ganglion cells. Explains why dichromats can see yellow, and after images: e. g. Red light excites red ganglion cells, while green light: this is why there is no reddish-green in our perception inhibits those cells. Dual process theory (combining the two theories together) The sorting out, interpretation, analysis and integration of stimuli by the sense organs and brain. Perception that is guided by higher-level knowledge, experience, expectations and motivations. Top-down processing is illustrated by the importance of context in determining how we perceive objects.

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