Eye
Electromagnetic spectrum range
380-800nm
Colored portion of the eye, caused dilation/constriction of pupil; light regulation (first ring of tissue from pupil)
Iris
A small depression in the retina of the eye where visual acuity is highest, contains only cones
Fovea
3 receptors in the retina responsible for color perception; primary colors in this theory are red, green,blue
Trichromatic theory
Ganglion cells in the periphery; LARGE brightness opponent receptive fields
Magnocellular system
Receptor surface in the cochlea that transduces sound waves into neural activity
Basilar membrane
Transparent/elastic, continues refraction/focusing onto retina. Held in place by suspensory ligaments
Lens
Muscles attached to the lens can contact to make it rounded; helps to focus on near objects
Accommodation
Cone photoreceptors are linked together to form 3 opposing color pairs; yellow, is primary color
Ventral stream
Membrane overlying hair cells
Tectorial membrane
Third part of the eye wall, contains rods and cones; photoreceptor cells, light rays are focused on it
Retina
Best in dim light, detail vision is poor, does not distinguish color
Rods
caused by lack of one or more cone types
Colorblindness
"Where" of processing, visual cortex to the parietal lobe dominated but magnocellular system
Dorsal stream
Transparent bulge in the front of the eye, curved, begins refraction
Cornea
Blind spot area where the retina leaves the eye and becomes the optic nerve; no rods/no cones
Optic disk
Best in bright light, detailed vision is good, subset distinguishes among color.
Cones
Inability to recognize colors despite intact color perception- left hemisphere damage
Color aphasia
Cannot identify object, IT cortex damage; Cannot identify people by faces, IT/FFA damage
Prosopagnosia
Space/black hole through which the light passes
Pupil
Cranial nerve carriers the nerve impluse to the thalamus, then to the occipital lobe of the cerebrum, where vision is located.
Optic nerve
Cells in retina
Ganglion,Bipolar, Horizontal, and amacrine
Ganglion cells located in the fovea; small, color opponent circular receptive fields, discrimination of fine details;/color
Parvocellular system
damage to V1 causes cortical blindness BUT superior colliculus also connect to the striate cortex independently