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the process by which our sensory receptors and nervous system receive and represent stimulus energies from our environment
the process of organizing and interpreting sensory information and enabling us to recognize meaningful objects and events
bottom up processing
analysis that behings with the sense receptors and works up to the brains intergration of sensory information
top down processing
information processing guided by higher level mental processes as when we conxtruct perceptions drawing our experience and expectations
the study of relationships between the physical characteristics of stimuli such as their intensity and our psychological experience of them
the minimum stimulation needed to detect a particular stimulus 50 percent of the time
signal dtection theory
predicts how and when we dectect the presence of a faint stimulus amid background stimulation. assume there is no absolute treshhold and that detection depends party on a persons experience expecattions motivation and level of fatigue
the minimum difference that a person can detect between to stimuli. we experience the difference treshold as just noticeable difference
the principle that to perceive their difference two stimuli must differ by a constact minimum percentage rather than a constant amount
coversion of one from of energy into another. in sensation, the transforming of stimulus energies into neural impulses
the amount of energy in a light or sound wave, brightenss or loundness, determined by amplitude
ring of muscle tissue that forms the colored protion of the eye around the pupil and controls the size of pupil opening
the process by which the eyes lens changes shape to focus the image of near objets to the retina
light sensitive inner surface of the eye containing the receptor nods and cones plus layers of neurons that behing the processing of visual information
condition in which nearby objects are seen more clearly than distant objets because the lens focuses the image of distant objects in the front of the retina
condition in which faraway objects are seen more clearly than near objets because the image of near objets is focused behind the retina
retinal receptors that detect black white and gray, necessary for peripheral and twilight vision when cones dont respond
receptor cells that are concentrated near the center of the retina tha function in daylight or in well lit conditions. the cones detect fine detail and give rise to color sensations
the point at which the potic never leaves the eye creating a blind spot because there are no receptor cells
nerve cells in the brain the respond to specific features of the stimulus such as shape angle or movement
processing of several aspects of a problems simultaneously, the brains natural mode of information processing for many fuctions including vision. contrasts with stepe by step processing of most computers and of conscious problems solving
young helmholtz trichromatic three color theory
theory that the retina contains three different color receptors, which when stimulated in combination can produce toe perception of any color. on senstivie to red one to green one to blue
opponent process theory
theory that opposing retinal process (red green yellow blue white black) enable color vision. ex-some cells are stimulated by green and inhibited by red ect
perceiving familiar objects as having consistent color, even if changing illumination alters the wavelengths reflected by the object
chamber between the eardrum and cochlea containing three tiny bones, concentrate the vibrations of the eardrum on the cochleas oval window
coiled, bony fluid filled tube in the inner ear through which sound waves trigger nerve impulses
in hearing, the theory that links the pitch we hear with the place where the cochyleas membrane is stimulated
theory that the reate of nerve impulses traveling up the auditory nevrve matches the frequency of a tone, thus enabling us to sense its pitch
conduction hearing loss
hearing loss cusae by damage to the mechanical system that conducts sounds waves to the cochlea
sensorineural hearing loss
hearing loss cause by damage to the cochleas receptor cells or to the auditory nerves`
gate control theory
theory that the spinal cord contails a neurological gate that blocks pain singals or allows them to pass on to the brain. gate is opened by the acitivty of pain signals traveling up small nerve fibers and is closed by activity in large fivers or by information coming from the brain
principle that one sense may influence another, as when the smell of food influences its taste
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