psychology sensation and perception

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79 Terms

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sensation
detection of physical energy from the environment and the encoding of it as neural signals
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perception
selecting, organizing, and interpreting of our sensations
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bottom-up
not knowing what's coming; pure sensory experience; no prior knowledge
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top-down
you have an idea of what's coming; influences your experiences
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absolute threshold
the lowest level of stimulation that a person can detect; 50% of the time ex) the sight and hearing test
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difference threshold
the smallest change in stimulation that a person can detect; the point you can tell the difference between something
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signal detection theory
predicts when we will detect weak signals
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weber's law
the concept that a just-noticeable difference in a stimulus is proportional to the magnitude of the original stimulus; a noticeable difference
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sensory adaptation
getting used to a sense; ex)smelling something gross and it goes away after a few minutes
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habituation
a general accommodation to unchanging environmental conditions; weakening of response to stimulus; ex) recognizing the noise of the ac
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transduction
transformation of physical stimuli into neural impulses for our brain to interpret; occurs in the retina
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wavelength
color; cones
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amplitude
brightness; rods
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light pathway through the eye
cornea, iris/pupil, lens, retina(rods and cones)
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fovea
high concentration of cones
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visual agnosia
inability to recognize or interpret objects in the visual field
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color blindness
genetic inability to distinguish differences in hue; can't identify different wavelengths
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parallel processing
taking in and processing of various sensory information simultaneously
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trichromatic theory
red, blue, and green
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color constancy
ability to recognize color of an object despite changes in light
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perceptual/shape constancy
ability to recognize a shape despite its angle changing
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size constancy
ability to perceive an object as being the same size despite the fact that the size of its retinal image changes depending on its distance from the observer
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perceptual set
notice only certain aspects of an object or situation while ignoring other details
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noise pathway through the ear
outer ear, middle ear, oval window, inner ear, auditory nerve, thalamus, temporal lobe
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volume
amplitude; frequency of wavelengths determines pitch
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tinnitus
ringing or sounds in the ear with no external source
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sensorineural hearing loss
hearing loss due to failure of the auditory nerve; due to age
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conduction hearing loss
problems with the mechanical system that results in the conduction of sound waves; hearing aids can help(amplifies sound)
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place theory
we detect different pitches because different sound waves trigger activity at different places along the cochlear basilar membrane
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frequency theory
the rate of nerve impulses traveling up to the auditory nerve matches the frequency of the tone, allowing us to determine pitch
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taste
gustatory sense
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taste buds
modified skin cells; 50 receptor cells per bud
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basic taste sensations
sweet, salty, sour, bitter, umami
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smell
olfactory sense
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olfactory cells
line olfactory epithelium of the nasal passage
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scent pathway through the nose
olfactory receptors, olfactory bulb, cerebral cortex, hippocampus, amygdala, hypothalamus
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touch
tactile sense
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types of sensations
pressure, warmth, cold, pain
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phantom sensations
feeling pain in a place that doesn't exist; ex) amputees
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substance p
neurotransmitter that relays pain
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gate control pain
messages from the brain/body can "close the gate" for pain messages
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vestibular system
balance/equilibrium
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selective attention
at any moment our awareness focuses on only a limited aspect of all that we experience
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visual capture
vision competes with other senses, usually wins
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inattentional blindness
inability to see/notice things due to attention being redirected
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change blindness
something in our environment changes, but we don't noticeq
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monocular cues
cues that can be detected with only one eye
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binocular cues
cues that can be detected with two eyes
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retinal desparity
our retinas pick up on 2 slightly different images; our brain interprets this as relative distance; BC
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convergence
eyes move inward when something is coming toward you; BC
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relative height
higher things in our field of vision are perceived as further away; MC
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relative size
the smaller the image, the further away it is; MC
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relative clarity
the further away something is, the more foggy/hazy it is; MC
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interposition
if an object partially blocks our view, we thinks it's closer;MC
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linear perspective
parallel lines that appear to converge with distance; MC
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texture gradient
objects closer to us are drawn with more detail; MC
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convergence
our brain interprets to help us discern objects moving towards us; BC
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motion parallax
items that are close, appear to be moving faster in motion that items far away; MC
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phi phenomenon
the illusion of motion
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gestalt
german for whole or form
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gestalt principles
closure, proximity, similarity, continuity
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cornea
the clear, dome shaped tissue covering the front of the eye
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iris
the colored part of the eye; controls the amount of light that enters the eye by changing the size of the pupil
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lens
a crystalline structure located just behind the iris; focuses light onto the retina
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optic nerve
the nerve that transmits electrical impulses from the retina to the brain
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pupil
the opening in the center of the iris; changes its size as the amount of light changes
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retina
sensory tissue that lines the back of the eye; contains millions of rods and cones that convert light rays into electrical impulses that are relayed to the brain via the optic nerve
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vitreous
a thick, transparent liquid that fills the center of the eye; mostly water and gives the eye its form and shape
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anvil
a tiny bone that passes vibrations from the hammer to the stirrup
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cochlea
a spiral shaped, fluid filled inner ear structure; lined with cilia that move when vibrated and cause a nerve impulse to form
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eardrum
a thin membrane that vibrates when sound waves reach it
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eustachian tube
a tube that connects the middle ear to the back of the nose; it equalizes the pressure between the middle ear and the air outside
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hammer
a tiny bone that passes vibrations from the eardrum to the anvil
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nerves
carry electro-chemical signals from the inner ear(cochlea) to the brain
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outer ear canal
the tube which sound travels through the eardrum
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pinna
the visible part of the outer ear; collects sounds and directs it into the outer ear canal
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semicircular canals
three loops of fluid filled tubes that are attached to the cochlea in the inner ear; maintain sense of balance
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stirrup
tiny, u-shaped bone that passes vibrations frim the stirrup to the cochlea; smallest bone in the human body
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ossicles
the three bones in the ear (sah)