Studied by 1 person
trichromatic theory
colour vision is determined by three different cone types that are sensitive to short, medium, and long wavelength light.
the activity of trichromatic theory
The combined activity of all three cones that generate a unique signature associated with each perceived colour even colours without a corresponding wavelength.
magenta
cant be seen on the wavelength, odd way our brain happens to respond when hit red with blue light.
colour deficiency
colour blindness, two cones functioning only on x chromosome
monochromatism
one cone type
dichromatism
two cone type
tetrachromatism
three cone type
opponent-process theory
percieve colour in terms of opposite ends of the spectrum (red to green, yellow to blue, white to black)
what to do ganglion cells provide
three colour channels certain colours are natural opposites
negative afterimages
opponent process theory supported by evidence from negative afterimages
horizontal cells
inhibitory interneurons (GABA releasing) that connect between photoreceptors
beyond the retina: optic chiasm
crossover point for optic nerve at midpoint of the brain
beyond the retina: lateral geniculate nucleus
region within thalamus that directs visual information throughout the brain, also receives 90% of visual signals from optic nerve
primary visual cortex: feature detection cells
neurone that respond selectively based on specific aspects of a stimulus as well as to specific regions of the visual field
primary visual cortex:
all possible angles are accounted for at any location in our vision
Note
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