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27 Cards in this Set

  • Front
  • Back
Sensation
stimulation of sense organs
Perception
selection, organization, and interpretation of sensory input
Psychophysics
study of how physical stimuli are translated into psychological experience
Absolute Threshold
sensation begins with a stimulus; AT is the minimum stimulus intensity that is detected 50% of the time
Signal Detection Theory
detection of stimuli involves decision processes as well as sensory processess
Visible Spectrum
part of electromagnetic spectrum to which the eyes respond
light=magnetic radiation
Cornea
where the light enters the eye
Pupil
regulates amount of light
Iris
colored ring of muscles that constricts/dilates via amount of light
Lens
Focuses the light rays on the retina
Retina
Absorbs light, processes images, and sends info to the brain
Blind Spot
where the optic nerve leaves the eye
Nearsighted
close objects are seen clearly but distant objects are blurry because the focus of light falls short of the retina
(cornea/lens bends light too much or eyeball too long)
Farsighted
distant objects are seen clearly but close objects appear blurry because the focus of light falls behind the retina
(eyeball too short)
Stigmatism
mishapen lens; use non- symmetrical lens to focus light
Rods
black/white and low light vision
receptor cell
Cones
color and daylight vision
good acuity
receptor cell
Foeva
tiny spot that contains only cones, visual acuity greatest
Dark Adaption
eyes become more sensitive to light in low illumination
Light Adaption
eyes become less sensitive to light in high illumination
Receptive Field
area in which stimulation leads to a response of a sensory neuron
Lateral Antagonism
neural activity in a cell opposes the activity in surrounding cells
Lateral Geniculate Nucleus
location of about 90% of the axons from the retina; visual signals processed then distrubuted to the primary visual cortex
Magnocellular Channel
subdivision of the main visual pathway (LGN), "where" pathway
Parvocellular Channel
subdivision of the main visual pathway (LGN), "what" pathway
Superior Colliculus
area in the midbrain
Parallel Processing
simultaneously extracting different kinds of information from the same input