Vision (unit 3) Flashcards
frequency
distance from one peak of one wave to next wave
short wavelength/high freq
blue/violet
long wavelength/low freq
red
amplitude
corresponds to brightness
large amp/intensity
bright color
small amp/intensity
dull color
pupil
dark hole in center of iris reduces glare
iris
pigmented muscle that gives eye color
cornea
focuses light more sharply
lens
reacts to bend rays of light so properly focused
retina
contains photoreceptors rods and cones that transduce light energy to electrochemical energy
fovea
where vision is shaped
optic nerve
carries info to brain about light
blind spot
optic nerve leaves eye on its way to the brain
accomodation
eyes lens changes shape to help focus near or far objects on the retina
nearsighted
light rays focus in middle of retina, eyeball is too long
farsighted
focus behind fovea, eyeball is too short
astigmatism
irregularity in shape of cornea or lens
rods
can receive light energy in low light but are unable to detect color
cones
detect color in light and functions in the daytime
optic chiasm
fibers from nasal sides of two retinas cross
visual cortex
occipital lobe of both hemispheres, contains specialized cells for visual perception
feature detectors
activation of neurons in cortex that respond to specific features of stimulus
parallel processing
processing of several aspects of the stimulus simultaneously
trichromatic theory
3 different types of photoreceptors sensitive to different ranges of red, blue, and green
opponent processing
suggests that receptor cells are linked in pairs working in opposition with each other
