Chapter 3 Review Flashcards
Light waves
Vary in wavelength
Light waves affect the perception of
Amplitude
Wavelength
Purity
Amplitude
Brightness
Wavelength
Color (hue)
Purity
Saturated
Light is registered by
Receptors in the eye
Focuses light rays falling on the retina
Lens
Regulates amount of light passing near the rear of the eye
Pupil
Neural tissue lining inside back surface of the eye
Retina
A hole int he retina that corresponds to blind spot
Optic disk
A tiny spot in center of retina where visual acuity is greatest
Fovea
Play key role in night and peripheral vision is greatly outnumber cones
Rods
Play a key role in day and color vision and provide greater acuity than rods
Cones
Collections of rods and cones that funnel signals to specific visual cells in the retina or the brain
Receptive fields
Makes visual system sensitive to contrast rather than absolute levels of light
Lateral antagonism
Handles perception of color
Parvocellular channel
Processes information regarding brightness
Magnocellular channel
Handles coordination of usual input with other sensory input
Second visual pathway
Located in occipital lobe handles initial cortical processing of visual cortex that respond reletively to specific features of complex stimuli
Primary visual cortex
Neurons in the visual cortex that respond selectively to specific features of complex stimuli
Feature detectors
“Where” pathway
Dorsal stream
“What” pathway
Ventral stream
A discrepancy between the appearance of a visual stimulus and its physical reality
Defined
Works by removing some wavelength of light, leaving less light
Subtractive color mixing
Works by putting more light in the mixture than any one light
Additive color mixing
Holds that the eye has three groups of receptors seisive to wavelengths
Trichromatic Theory
Blue
Red
Green
Trichromatic theory
Receptors make antagonistic responses to each 3 pairs of colors; members in each par work in opposition to each other
Opponent Process theory
Normal color vision; 3 functioning cone systems (Red/Green, Yellow/Blue, White/Black)
Trichromat
2 functioning system, usually black/white and yellow/blue
Dichromat
1 functioning system; color blind; can only see in black/white; and shades of grey; occurs twice as often in males that females
Monochromat
Carried on x gene
Color-blindness
Detecting specific elements and assembling them into complex forms - Gestalt principles
Feature Analysis
Viewers tend to supply missing elements to close or complete a figure
Closure