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EYE PT. 2 & EAR PT. 1 (photoreceptors (parts (cones (high light, color…
EYE PT. 2 & EAR PT. 1
photoreceptors
location
: back of the retina
purpose
: photopigments signal brain when light is seen
parts
cones
high light
color
fovea
6 million
rods
low light vision
periphery
120 million
fovea
.5-3 degrees of vision
only cones
color vision
young-helmholtz trichromatic theory
3 different color cones
each responds to a different wavelength (SML) some response to all
hering's opponent-process theory
RG/BY opponent process cells filter color message to brain
exposure to the counterpart will leave a counter image
color blindness
malfunction in 1+ of the three cones
usually in men bc it's carried on the X chromosome
auditory system
sound
: pressure changes in a medium capable of being detected by auditory organs
tympanic membrane or eardrum
vibrates in response to pressure changes in the atmosphere
ossicles
3 bones
move vibrations
cochlea
fluid filled, bony, snail shell
contains small inner ear structures
hair cells
receptors for sound attached to auditory nerve
movement > brain
like photoreceptors
semicircular canals
endolyph filled tubes that bend