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Chapter 4
Sensory and Perception
69
Psychology
Undergraduate 1
02/16/2012

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Term
Sensation
Definition
stimulation of sense organs
Term
Absolute Threshold
Definition
Specific type of sensory input is the minimum amount of stimulation that an organism can detect
Term
Psychophysics
Definition
study of how physical stimuli are translated into a psychological experience
Term
Stimulus
Definition
detectable input from environment that do and do not have a detectable effect
Term
Threshold
Definition
dividing point between energy levels that do and do not have a detectable effect
Term
Just Noticable Difference
Definition
Smallest difference in the amount of stimulation that a specific sense can detect
Term
Fechner's Law
Definition
States that the size of a just noticeable difference is proportional to the number of JNDs that the stimulus causing the experience is above absolute threshold
Term
Webner's Law
Definition
states that the size of a just noticeable difference is a constant proportion of the size of the initial stimulus
Term
S.S. Stevens
Definition
magnitude estimation involved asiding subject to assign numbers to stimuli
Term
Signal Detection Theory
Definition
the detection of stimuli involved decision process as well as sensory process- influenced by factors besides stimulus intensity
Term
Subliminal Perception
Definition
Registration of sensory input without conscious awareness
Term
Sensory Adaptation
Definition
gradual decline in sensitivity to prolonged stimulation
Term
Retina
Definition
In the eye- recieves light- houses tissue
Term
Lens
Definition
transparent eye structure that focuses the light rays falling on the retina
Term
Accomodation
Definition
When curvature of lens adjusts to alter visual focus
Term
Nearsighted
Definition
close objects are seen clearly but distant objects are blurred
Term
Farsighted
Definition
close objects are seen clearly but distant objects are blurred
Term
Pupil
Definition
Opening in the center of the iris that helps regulate amount of light passing to rear chamber of eye
Term
Retina
Definition
Neaural tissue lining the inside back surface of the eye; absorbs light and sens info to brain
Term
Optic Disk
Definition
Hole in the retina where optic nerve fibers exist in eye
Term
Cones
Definition
specialized visual receptors (daylight and color vision)
Term
Fovea
Definition
Tiny spot in center of the retina that contains only cones; visual acuity is greatest at this spot
Term
Rods
Definition
Specialized visual receptors (night and peripheral)
Term
Dark Adaptation
Definition
Process in which the eyes become more sensitive to light in low illumination
Term
Light Adaptation
Definition
Process whereby the eyes became less sensitive to light in high illumation
Term
Receptive field of visual cell
Definition
Retina area that, when stimulated, affects the firing of that cell
Term
Optic Chlasm
Definition
point at which optic nerves from the inside half of each eye cross over and then project to the opposite half of the brain
Term
Parallel Processing
Definition
Involves stimultaneously extracting different kinds of specific features of more complex stimuli
Term
Feature Detectors
Definition
Neurons that respond selectively to very specific features of moved complex stimuli
Term
Agnosia
Definition
inability to recognize objects
Term
Prosopagnosia
Definition
inability to recognize familiar faces
Term
Subtractive color mixing
Definition
removing wavelengths or light- leaving less light than was originally
Term
Addictive color mixing
Definition
super imposing lights, putting more light in the mixture than exists in any one light by itself
Term
Trichromatic theory of color vision
Definition
the human eye has three types of receptors with different sensitivities to different light wavelengths
Term
Blindness
Definition
Encompasses a variety of deficiencies in the ability to distinguish among color
Term
Complementary colors
Definition
pains of colors that produce grey tones when mixed together
Term
After image
Definition
visual image that persists after a stimulus is removed
Term
Opponent process
Definition
theory of color vision- color vision depends on receptors that make an antagonistic response to three pairs of colors
Term
Reversible figure
Definition
drawing that is compatible with two interpretations that can shift back and forth
Term
Perceptual set
Definition
readiness to percieve a stimulus in a particular way
Term
Feature analysis
Definition
process of detecting specific elements in visual input and assembling them into a more complex form
Term
Feature analysis
Definition
process of detecting specific elements in visual input and assembling them into a more complex form
Term
Bottom-up processing
Definition
progression from individual elements to the whole
Term
Top-down processing
Definition
progression grom the whole to the elements
Term
Phil phenomenon
Definition
the illusion of movement created by presenting visual stimuli in rapid succession
Term
Distall Stimuli
Definition
stimulus that lie in the distance
Term
Proximal stimuli
Definition
stimuli that lie in the distance
Term
Perceptual Hypothesis
Definition
inference about which distall stimuli could be responsible for the proximal stimuli sense
Term
Depth perception
Definition
interpretation of visual dues that indicate how near or few away objects are
Term
Dept cues
Definition
cues about distance based on the differing views of two eyes
Term
Retinal Parity
Definition
the fact that objects within 25ft project images slightly altered
Term
Convergence
Definition
sensing the eyes converging towards each other as they focus on closer objects
Term
Monocular depth cues
Definition
cues about distance based on the image in either eye alone
Term
Motion parallax
Definition
involves images of objects at different distances moving across the retina at different rates
Term
Pictoral depth cues
Definition
clues about distance that can be given in a flat picture
Term
Perceptional constancy
Definition
tendency to experience a perception in the face of continually changing sensory input
Term
Optical Illusion
Definition
involves an apparently inexplicable discrepancy between the appearance of a visual stimulus and its physical reality
Term
Impossible figures
Definition
objects that can be represented in two-dimensional pictures but cannot exist in three dimensional space
Term
Cochlea
Definition
fluid-filled coiled tunnel that contains the receptors for hearing
Term
Place theory
Definition
perception of pitch corresponds to the vibration of different portions , or places, along the basilar membrane
Term
Basilar membrane
Definition
which runs the length of the spiraled cochlea, holds the auditory receptors
Term
Frequency theory
Definition
holds that perception of pitch corresponds to the rate or frequency at which the entire basilar membrane vibrates
Term

Auditory localization

 

Definition
locating the source of a sound in space
Term
Gustatory system
Definition
cue sensory system for taste
Term
Olfactory system
Definition
the sensory system for smell
Term
Gate control theory
Definition
incoming pain sensations must pass through a "gate" in the spinal cord that can be close, thus blocking ascending pain signals
Term
Vestibular system
Definition
which responds to gravity and keeps you informed of your body's location in space
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