the process by which our sensory receptors (eyes, ears, skin) and nervous system receive and represent stimulus energies from environment
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stimulus
anything that you’re taking in
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bottom-up processing
analysis that begins with sensory receptors and works up to the brain’s integration of sensory information
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perception
process of organizing and interpreting sensory information, enabling us to recognize meaningful objects and events
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top-down processing
information processing guided by prior experiences, ideas, and expectations, working down to interpret sensations
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transduction
converting one form of energy into another that our brain can use (ex: light and sound waves converted to sight and hearing)
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absolute threshold
refers to the minimum level of stimulus intensity needed to detect a stimulus half the time, anything below the threshold is “subliminal”
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priming
the activation, often unconsciously, of certain associations, thus predisposing pone’s perception, memory, or response
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subliminal messages
below one’s absolute threshold for conscious awareness
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difference threshold
the minimum difference between two stimuli (weight, temperature) for a person to detect the difference half the time
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Weber's law
different thresholds increase with the magnitude of the stimulus half the time (ex:50 degrees to 60 is a big diff vs 1000 degrees to 1010 degrees), size of difference threshold is greater for heavier objects than lighter ones
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sensory adaptation
diminished sensitivity to stimuli as result of constant stimulation, bad smells or loud noise
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perceptual set
mental predisposition to perceive one thing and not another
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*psychophysics
objective stimuli (exact temperature, decimals etc) is subjective among individuals’ perception (psychological influence on the physical world) physical characteristics of stimuli and our psychological experience of them
hue (long wavelength = low frequency, short wavelength = high frequency) - distance between two wave crests
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amplitude
height, intensity/brightness
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cornea
protects eye/bends light
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pupil
small adjustable opening
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iris
colored muscle that dilates/constricts in response to light intensity - regulates amount of light entering eye
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lens
focuses light rays into an image on fovea in back of eyeball, can change curvature to focus
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accommodation
the process by which the eye’s lens changes shape to focus near or far objects on the retina
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retina
blood vessel tissue on eyeball’s inner surface
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rods and cones
light energy chemical changes on retina’s receptor cells
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fovea
the image you’re looking at upside down, not on the eye
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bipolar cells/ganglion cells
type of neuron located near the inner surface of the retina of the eye, receives visual information from photoreceptors via bipolar cells
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optic nerve
ganglion cell axons twisted together, carries neural impulses from eye to brain
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blindspot/optic disc
point at which optic nerve leaves the eye creating a blind spot, since no receptor cells are located there
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feature detectors
neurons in visual cortex that respond to specific features of a visual stimulus (angles, edges, lines) - consist of nerve cells in brain
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parallel processing
sensory details are processed in separate areas of the brain that combine to form an image (color, motion, form, depth)
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*Young-Helmholtz trichromatic (three-color) theory
there are three types of color receptor cones in eye (red, blue, green), all colors are stimulated combinations of these cones
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*opponent-process theory
cones compete (red v green, blue v yellow, black v white) and color vision is the result, explains why we can’t see “reddish green” or “yellowish blue” and why we see after images
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after images
overwhelm cones with one color that the other one doesn’t come through to the surface until it goes away, something left over that wasn’t there before
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stroop effect
our tendency to experience difficulty naming a physical color when it is used to spell the name of a different color
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color blindness
people with missing rods or cones, gene mutations, or eye damage may have color blindness, inability to discriminate between colors and to perceive color hues
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gestalt
german word for “form” or “whole”, early study of visual organization, we organize clusters of sensations into meaningful patterns that make sense to us
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figure/ground
perceive objects (figure) as separate from their surroundings (the background), some images give us an ambiguous option without a clear figure or ground
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grouping
organize stimuli/figures into meaningful forms
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proximity
we group nearby figures together
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continuity
we perceive continuous patterns rather than separated ones
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closure
we fill in gaps to create a whole object, perceive disconnected parts as a whole
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similarity
we group things that are similar
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depth perception
ability to see objects in three dimensions although the images that strike the retina are two-dimensional; allow us to judge distance
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binocular disparity
brain uses both eyes to judge distance, the greater the disparity (difference) between the two objects, the closer the object
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monocular cues
we can judge depth in two dimensional images like photos/paintings/screens by only using one eye
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relative size
we see familiar objects (of known size) as farther away when they appear smaller
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interposition
partially covered objects appear further away
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relative height
we tend to perceive the higher part of a scene as farther away
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relative motion
when we are moving, we can tell which objects are farther away because it takes longer to pass them (closer moves faster, farther is smaller - ex: clouds and moon)
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linear perspective
the convergence of parallel lines indicates greater distance, two lines meet the retina as being the same size, however, our perception of distance affects our perception of length
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light and shadow
highlights and shadows can provide information about an objects dimension and depth, because visual system assumes the light comes from above, a totally different perception is obtained if this image is viewed upside down
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visual cliff
babies are inborn with depth perceptions
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perceptual constancy
enables us to see an object as unchanging even as illumination and retinal images change (example of top down processing)
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color constancy
we perceive familiar objects as having consistent color/shade, even if the color is actually different
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brightness constancy
the tendency to perceive a familiar object as having the same brightness under different conditions of illumination
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relative luminance
amount of light an object reflects relative to its surroundings
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shape constancy
the perception of the shape of a given object remains constant despite changes in the shape of the object's retinal image
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size constancy
the result of cognitive scaling operations that enable us to perceive an object as having the same size when presented at different viewing distances
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Ames room
1934 room designed to manipulate our size constancy
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moon illusion
moon seems larger on the horizon than in the sky
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restored vision
people born blind and gain sight later in life
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perceptual adaptation
humans can adapt and their brains can adjust their perception, artificially displaced or inverted visual field
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audition
hearing
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amplitude
loudness/volume of sounds - height of soundwave
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frequency
pitch - length of soundwave
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decibels
measure sound, logarithmic unit used to measure sound level
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eardrum
separates the outer ear from the middle ear, membrane vibrates when sound waves strike it converting the sound wave into a nerve impulse that travels to the brain
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middle ear (the hammer, anvil, and stirrup)
chamber between eardrum and cochlea containing three tiny bones that concentrate the vibrations of the eardrum on the cochlea’s oval window
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cochlea (in inner ear)
coiled, bony, fluid-filled tube in the inner ear; sound waves traveling through the cochlear fluid trigger nerve impulses
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basilar membrane
main mechanical element of the inner ear, vibrates in the cochlea
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hair cells
sensory receptors in ear, loudness is determined by the number of activated hair cells in the cochlea
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conduction hearing loss
problems with outer/middle ear not conducting sound well to cochlea, can be treated with hearing aids, common cause is ear infections
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sensorineural hearing loss
cochlea’s hair cell receptors (inner ear)/ nerve damage can cause this more common form of hearing loss, can be caused by disease, aging, exposure to loud noise
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cochlear implant
can restore hearing for nerve deafness, converts sounds into electrical signals
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place theory
perception of pitch is associated with vibration of different proportions of cochlea, where basilar membrane is stimulated
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frequency theory
perception of pitch is associated with the frequency at which the entire basilar membrane vibrates
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senses of touch
pressure, warmth, cold, and pain
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pain
body’s way of telling you something has gone wrong
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nociceptors
sensory receptors that detect hurtful temperatures, pressures, or chemicals
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mechanoreceptors
sense pressure, texture, vibrations
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thermoreceptors
sense temperature
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gate-control theory
spinal cord has a “gate” that either blocks pain signals from small nerve fibers or allows them to pass to brain
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phantom limb sensations
brain creates pain after a limb amputation, brain is misinterpreting sensory input
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hypnosis
social interaction where a hypnotist suggests to a subject that certain perceptions, feelings thoughts, or behaviors will spontaneously occur
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posthypnotic suggestions
suggestion made during a hypnosis session to be carried out after the subject is no longer hypnotized, helped reduce headaches, asthma, obesity but doesn’t help with addiction
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social influence theory
patients may be acting the role of a “good hypnotic subject”, influenced by hypnotist/crowd
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divided-consciousness theory of hypnosis
dissociation, proposes that hypnosis is a special dual-processing state where an individual is split between different levels of consciousness
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selective attention
may also play a role in hypnotic pain relief - increases activity in frontal lobe attention systems
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taste sensations
sweet, sour, salty, bitter and umami
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sensory interaction
the principle that one sense may influence another, as when the smell of food influences its taste
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smell (olfaction) process
receptors smells in nasal passage go to the olfactory bulb and skip the thalamus to the limbic system and temporal lobe. Limbic system triggers memories and emotions (hippocampus)
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embodied congition
brain circuits that process sensations connect with those responsible for cognition (thinking) - perception changes the way you think (holding a warm cup of tea rather than a cold one makes us nicer)
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*kinesthesis
how we coordinate movement without having to constantly watch our movements
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vestibular sense
chambers in our ear have hair like receptors that send messages to cerebellum to help us balance
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semicircular canals
three tiny, fluid-filled tubes in your inner ear that help you keep your balance
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vestibular sacs
respond to balance and encode information about the head's orientation.
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retinal disparity
distance between or right and left eyes functions to provide us with a cue for depth perception