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the process by which our sensory receptors and nervous system receive and represent stimulus energies from our environment
analysis that begins with the sense receptors and works up to the brain's integration of sensory information
the minimum difference between two stimuli required for detection 50 percent of the time
signal detection theory
a theory predicting how and when we detect the presence of a faint stimulus ("signal") amid background stimulation ("noise")
failure to detect stimuli that are in plain sight when our attention is focused elsewhere
the principle that, to be perceived as different, two stimuli must differ by a constant minimum percentage
a ring of muscle tissue that forms the colored portion of the eye around the pupil and controls the size of the pupil opening
the transparent structure behind the pupil that changes shape to help focus images on the retina
the light-sensitive inner surface of the eye, containing the receptor rods and cones plus layers of neurons that begin the processing of visual information
retinal receptors that detect black, white, and gray; necessary for peripheral and twilight vision, when cones don't respond
retinal receptor cells that are concentrated near the center of the retina and that function in daylight or in well-lit conditions, detect fine detail and give rise to color sensations
the point at which the optic nerve leaves the eye, creating a blind spot because no receptor cells are located there
idea that color vision is based on our sensitivity to three different colors: blue, green, and red
a tightly stretched membrane at the end of the ear canal that vibrates when hit by sound waves
a coiled, bony, fluid-filled tube in the inner ear through which sound waves trigger nerve impulses
the idea that different sound frequencies stimulate different locations on the basilar membrane
that the rate of nerve impulses traveling up the auditory nerve matches the frequency of a tone, enabling us to sense its pitch
conduction hearing loss
hearing loss caused by damage to the hair cells that conducts sound waves to the cochlea
sensorineural hearing loss
hearing loss caused by damage to the cochlea's receptor cells or to the auditory nerves; also called nerve deafness
nerve cells in the brain that respond to specific features of the stimulus, such as shape, angle, or movement
a device for converting sounds into electrical signals and stimulating the auditory nerve through electrodes threaded into the cochlea
impulses from sensory receptors, the principle that one sense may influence another, as when the smell of food influences its taste
gate -control theory
the theory that the spinal cord contains a neurological "gate" that blocks pain signals or allows them to pass on to the brain
the organization of the visual field into objects that stand out from their surroundings
the perceptual tendency to organize stimuli into meaningful groups: proximity, similarity, continuity, connectedness, closure
the ability to see objects in three dimensions although the images that strike the retina are two-dimensional, allows us to judge distance
distance cues, such as linear perspective and overlap, available to either eye alone: relative height, relative size, interposition, linear perspective, relative motion, light and shadow
a binocular cue for perceiving depth; by comparing images from the two eyeballs, the brain computes distance - the greater the disparity (difference) between the two images, the closer the object
the ability to adjust to an artificially displaced or even inverted visual field
the controversial claim that perception can occur apart from sensory input. Said to include telepathy, clairvoyance, and precognition.
perceiving familiar objects as having consistent color, even if changing illumination alters the wavelengths reflected by the object
in vision, the ability to adjust to an artificially displaced or even inverted visual field
an illusion of movement created when two or more adjacent lights blink on and off in quick succession
the innermost part of the ear, containing the cochlea, semicircular canals, and vestibular sacs
the process by which the eye's lens changes shape to focus near or far objects on the retina
The processing of several aspects of a problem simultaneously; the brain's natural mode of information processing for many functions, including vision. Contrasts with the step-by-step (serial) processing of most computers and of conscious problem solving.
the amount of energy in a light or sound wave, which we perceive as brightness or loudness, as determined by the wave's amplitude
the dimension of color that is determined by the wavelength of light; what we know as the color names blue, green, and so forth
conversion of one form of energy into another. In sensation, the transforming of stimulus energies, such as sights, sounds, and smells, into neural impulses our brains can interpret.
The distance from the peak of one light or sound wave to the peak of the next. Electromagnetic wavelengths vary from the short blips of cosmic rays to the long pulses of radio transmission.
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