Sensation: Seeing Flashcards
wave packets
photons
determined by the amplitude of the wave—how high or how low the wave actually is
Brightness
determined by the length of the wave
Color (or hue)
purity of the color people perceive
Saturation
surface of the eye is covered in a clear membrane called
Cornea
watery fluid that continually replenished and supplies nourishment to the eye
Aqueous Humor
the light from the visual image then enters the interior of the eye through a hole
Pupil
can change the size of the pupil, letting more or less light into the eye
Iris
behind the iris, suspended by muscles, is another clear structure
Lens
a process wherein the lens changes its shape from thick to thin, enabling it to focus on objects that are close or far away
Visual Accommodation
light passes through a large, open space filled with a clear, jelly-like fluid called
Vitreous Humor
final stop for light within the eye:
a lightsensitive area at the back of the eye containing three layers: ganglion cells, bipolar cells, and the rods and cones, special receptor cells (photoreceptors)
Retina
visual sensory receptors found at the back of the retina, responsible for noncolor sensitivity to low levels of light
Rods
visual sensory receptors found at the back of the retina, responsible for color vision and sharpness of vision
Cones
area in the retina where the axons of the three layers of retinal cells exit the eye to form the optic nerve; insensitive to light
Blind Spot
the recovery of the eye’s sensitivity to visual stimuli in darkness after exposure to bright lights
Dark Adaptation
the recovery of the eye’s sensitivity to visual stimuli in light after exposure to darkness
Light Adaptation
theory of color vision that proposes three types of cones: red, blue, and green
Trichromatic Theory
occur when a visual sensation persists for a brief time even after the original stimulus is removed
Afterimages
theory of color vision that proposes visual neurons (or groups of neurons) are stimulated by light of one color and inhibited by light of another color
Opponent-Process Theory
caused by defective cones in the retina of the eye
Color Blindness
type of color-deficient vision where people either have no cones or have cones that are not working at all
Monochrome Color Blindness
type of color-deficient vision where people have one cone that does not
work properly
Dichromatic Vision
