UNIT 3 (CH 4) Flashcards
the process by which our sensory receptors and nervous system receive and represent stimulus energies from our environment
sensation
the process of organizing and interpreting sensory information, enabling us to recognize meaningful objects and events
perception
analysis that begins with the sensory receptors and works up to the brain’s integration of sensory information
bottom-up processing
information processing guided by higher-level mental processes, as when we construct perceptions drawing on our experience and expectatinos
top-down processing
the focusing of conscious awareness on a particual stimulus
selective attention
predicts how and when we detect the presence of a faint stimulus (signal) amid background stimulation (noise). Assumes there is no single absolute thershold and the detection depends partly on a person’s experience, expectations, motivation, and alertness
signal detection theory
below one’s absolute threshold for conscious awareness
subliminal
the activation, often unconsciously, of certain associations, thus predisposing one’s perception, memory, or response
priming
the minimum difference between two stimuli required for detection 50% of the time. We experience the difference threshold as a just noticeable difference (jnd).
difference threshold
the principle that, to be perceived as different, two stimuli must differ by a constant percentage (rather than a constant amount)
Weber’s Law
diminished sensivity as a consequence of constant stimulation
sensory adaptation
the processing of many 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
parallel processing
links the pitch we hear with the place where the cochlea’s membrane is stimulated
place theory
the rate of nerve impulses traveling up the auditory nerve matches the frequency of a tone, thus enabling us to sense its pitch
frequency theory
the system for sensing the position and movement of individual body parts
kinesthesis
the sense of body movement and position, including the sense of balance
vestibular sense
spinal cord contains a neurological “gate” that blocks painsignals aor allows them to pass on to the brain. The “gate” is opened by the activity of pain signals traveling up small nerve fibers and is closed by activity in larger fibers or by information coming from the brain
gate-control theory
the principle that one sense may influence another, as when the smell of food influences its taste
sensory interaction
an organized whole, Gestalt psychologists emphasized our tendency to integrate pieces of information into meaningful wholes
gestalt
the organization of the visual field into objects (the figures) that stand out from their surroundings (the ground)
figure-ground
the perceptual tendency to organize stimuli into coherent groups
grouping
the ability to see objects in three dimensions although the images that strike the retina are two-dimensional; allows us to judge distance
depth perception
a laboratory device for retinal depth perception in infants and young animals
visual cliff
depth cues, suc as retinal disparity, that depend on the use of 2 eyes
binocular cues
a binocular for perceiving depth: By comparing images from the retinas in the two eyes, the brain computes distance - the greater the disparity (differnce) between the two images, the closer the object
retinal disparity
an illusion of movement created when two or more adjacent lights blinks on and off in quick succession
phi phenomenon
perceiving objects as unchanging (having consistent shapes, size, lightness, and color) even as illumination and retinal images change
perceptual constancy
perceiving familiar objects as having consistent color, even if changing illumination alters the wave-lengths reflected by the object
color constancy
in vision, the ability to adjust to an artificially displaced or even inverted visual field
perceptual adaption
a mental predisposition to perceive one thing and not another
perceptual set
the controversial claim that perception can occur apart from sensory input; includes telepathy, clairvoyance, and precognition
extrasensory perception (ESP)
the studt of paranormal phenomena, including ESP and psychokinesis
parapsychology
the theory that the retina conatina three different color receptors - one most sensitive to red, gree, and blue - which, when stimulated in combination, can produce the perception of any color
Young-Helmholtz trichromatic (three-color) theory
opposing retinal processes (red-green, yellow-blue, white-black) enable color vision
opponent-process theory
failing to see visible objects when our attention is directed elsewhere
inattentional blindness
failing to notice changes in the environment
change blindness
the study of relationships between the physical characterists of stimuli, such as their intensity, and our psychological experience of them
psychophysics
the minimum stimulation needed to detect a particular stimulus 50% of the time
absolute threshold
conversion of one form of energy into another - transfering stimulus energies into neural impulses our brains can interpret
transduction
the distance from the peak of one light or sound wave to the paek of the next. Electromagnetic wavelengths vary from the short blips of cosmic to the long pulses of radio thansmission
wavelength
the dimension of color that is determined by the wavelength of light
hue
the amount of energy in a light or sound wave, which we perceive as brightness or loudness, as determined by the wave’s amplitude
intensity
the adjustable opening in the center of the eye through which light enters
pupil
a ring of muscle tissue that forms the colored portion of the eye around the pupil and controls the size of the pupil opening
iris
the transparents structure behind the pupil that changes shape to help focus images on the retina
lens
the light-sensitive inner surface of the eye, containing receptor rods and cones plus layers of neurons that begin the processing of visual information
retina
the process by which the eye’s lens changes shape to focus near the far objects on the retina
accommodation
retinal receptors that detect black, white, and gray; necessary of peripheral vision and twilight vision
rods
retinal receptor cells that are concentrated near the center of the retina and that function in daylight ot in well-lit conditions. The cones detect fine detail and give rise to color sensations
cones
carries neural impulses from the eye to the brain
optic nerve
the point at which the optic nerve leaves the eye, creating a “blind” spot because no receptor cells are located there
blind spot
the central focal point in the retina, around which the eye’s cones cluster
fovea
nerve cells in the brain that respond to specific features of the stimulus, such as shape, angle, or movement
feature detectors
the act of hearing
audition
the number of complete wavelengths that pass a point in a given time
frequency
a tone’s experienced highness or lowness; depends on frequency
pitch
the chamber between the eardrum and cochlea containing 3 tiny bones (hammer, anvil, and stirrup) that concentrate the vibrations of the eardrum on the cochlea’s oval window
middle ear
a coiled, bony, fluid-filled tube in the inner ear through which sound waves trigger nerve impulses
cochlea
the innremost part of the ear, containing the cochlea, semicircular canals, and vestibular sacs
inner ear
hearing loss caused by damage to the mechanical system that conducts sound waves to the cochlea
conduction hearing loss
hearing loss caused by damage to the cochlea’s receptor cells or to the auditory nerves; also called nerve deafness
sensorineural hearing loss
a device for converting sounds into electrical signals and stimulating the auditory nerve through electrodes threaded into the cochlea
cochlear implant
depth cues, such as interposition and linear perspective, available to either eye alone
monocular cues
sensory nerve endings that respond to stimuli
sensory receptors
the eye’s clear, protective outer layer, covering the pupil and iris
cornea
sense of smell
olfaction
the influence of bodily sensations, gestures, and other states on cognitive preferences and judgements
embodied cognition
