University:
MacEwan University
Course:
PSYC 258 | Cognitive Psychology
Academic year:

2024
Views:

396

Pages:

2
Author:

Arthur M.

PERCEIVING COLOR • color provides salient a useful mo m an image a greatly ards in object recognition a segmentation m difterent regions o perceptual quantity, not a sensation • its appearance comes from transduction A franuformation o1 special distributions • 3 dimensions: - Hue: different colors -saturation: now much of pure color druted by wnite - value : now mense color 1a diluted by black. ΔWV → Δ Hue ΔI → Δ value ΔWV + ΔI → Δ saturation RETINAL CONES → 3 types of cone receptors each with different spectrai selectivity (can interpret different right from spectral distribution) The 3 cones differ in photopigment they carry and so differ m their sensitivity to light of different wavelengtns. s-cones: blue M - cones : green L - cones: red Trichromatic theory of color vision: numan eyes only perceive 3 colors (RBG). Experiencing coror correcates With the ratio of activities m different cone classes *ist retinal stage of color processing a when all 3 classes of cones are stimulated equally, we experience achromatic colors (black, white, grey) * 2nd stage of color processing: integrating activity m cones into 3 separate channels I OBlack & white OPPONENT -PROCESS 2 Red a green THEORY !!! HAPPENS IN THE CORTEX.