psychology unit 2

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171 Terms

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sensation

the activation of sense organs by a source of physical energy

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stimulus

energy that produces a response in a sense organ

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perception

the sorting out, interpretation, analyis, and integration of stimuli by the sense organs and brain

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psychophysics

the study of the relationship between the physical aspects of a stimulus and peoples psychological experience of the stimulus

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absolutle threshold

the lowest intensity of a stimulus that an organism can detect

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difference threshold (just noticeable difference)

the smallest level of added or reduced stimulation required to sense that a change in the stimulation has occurred

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Weber’s law

states that a just noticeable difference is a constant proportion to the intensity of an intial stimulus

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adaptation

an adjustment in sensory capacity after prolonged exposure to unchanging stimuli

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Gestalt Laws of Organization

series of principles that describe how we organize bits and pieces of information into meaningful wholes

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top-down processing

perception that is guided by higher level knowledge, experience, expectations, and motivations

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bottom-up processing

perception that consists of the progression of recognizing and processing information from the individual components of a stimuli and moving to the perception of a whole

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depth perception

the ability to view the world in 3 dimensions and to percieve distance

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binocular disparity

the difference in images seen by the left and right eye

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perceptual constancy

our understanding that physical objects are constant and do not vary, even though sensory input about them might vary

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visual illusions

physical stimuli that consistently produce errors in perception

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subliminal perception

the perception of messages about which we have no awareness

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consciousness

the awareness of sensations, thoughts, and feelings we are experiencing at a given moment, an understanding of environment around us and our private internal world

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unconscious wish fulfillment theory

sigmund freuds theory that dreams represent unconscious wishes that dreamers desire to see fulfilled

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manifest content

part of the dream that we remember, the story line

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latent content

underlying wishes that the dream represents

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dreams for survival theory

theory suggesting that dreams permit information that is critical for our daily survival to be reconsidered and reprocessed during sleep

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activation synthesis theory

hobsons theory that the brain produces random electrical energy during REM sleep that stimulates memories stored in the brain

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circadian rythms

biological processes that occurr regularly on 24 hr cycle

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daydreams

fantasies that people construct while awake

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suprachiasmatic nucleus

controls circadian rhythms

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synthethesia

condition in which two sneses are sensed at the same time

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transduction

transformation of stimulus energy to electrochemical energy of neural impulses

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signal detection theory

theory predicting how and when we detect presence of faint stimulus amid background stimulation

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selective attention

we center our attention on certain elements of our environment while other things blend into the background

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divded attention

when metnal focus is on multiple tasks or ideas, multitasking

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inattentiohnal blindness

focus is directed at one stimulus, blinding us to other stimuli

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change blindness

tendency to miss changes in immediate visual environment

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taste (gustation)

tastes we perceive are a two phse chemical reaction involving both our mouth and throat and nose

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smell (olfaction)

chemical molecules breathed in through nose, smell receptors lie in top of nasal passage, send impulses along olfactory nerve to olfactory bulb

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somesthetic senses

senses of skin allow us to feel light touch, pressure, pain, cold, and warmth

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pain

body’s warning signal that something is not right

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gate control theory

gate exists in spinal cord that switches pain on and off

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kinesthesis

system for sensing the position and movement of individual body parts

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gestalt psychologists

emphasize brains tendency to integrate pieces of info into meaningful wholes

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figure-ground pattern

tendency of visual system to simpligy a scene into main object we’re looking at, and put everything else in the background

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grouping

brains have tendency to organize stimuli into groups in order to process the complexity of the world

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binocular cues

require use of both eyes to perceive depth and distance

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convergence

our eyes move together to focus on an object that is close and that they would move farther apart for a more distant object

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monocular cues

cues that can be used for depth perception that involve only 1 eye, forms 3D from 2D

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linear perspective

depth cue, makes parallel lines appear to converge at a vanishing point on horizon

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interposition

when one object overlaps anothers, partially obscured object is perceived as being farther away

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relative size

if two objects are the same size, the farther away object will appear smaller

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relative height

we perceive objects higher in visual field as being further away, closer ones should be lower

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relative clarity

hazy obects are farther away than sharper/clear objects

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texture gradient

mthod of determining depth by noting distant objects are smoother in texture

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relative motion

when you are in motion, closer objects seem to zoom by faster than objects in the distance

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perceptual set

predisposition to perceive things in a certain way

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perceptual constancy

tendency to perceive an object you are familiar with as having constant shape, size, and brightness despite changes occurring

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lightness constancy

we perceive an object to have constant lightness even while illumination varies

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shape constancy

constancy we perceive objects as having constant size even while distance varies or angles

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parapsychology

study of alleged psychic phenomena

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non- REM stage 1

theta waves increase, alpha waves fade away, sensation of falling

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non-REM stage 2

body temp drops, sleep spindles, sleeptalking

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non-REM stage 3

deepe sleep, delta waves, most restorative, hard to awaken

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REM sleep

pardoxical sleep, rapid eye movements, muscles paralyzed, brain waves as if we are awake

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REM paralysis

presence of features of REM during transition into/ out of sleep

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microsleep

fleeting, uncontrallable brief episode of sleep, ranges from fraction of a second to 10 seconds

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learning

relativelt permanent changed in behavior brought about by experience

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classical conditioning

a type of learning in which a neutral stimulus comes to bring about a response after it is paired with a stimulus that naturally brings about that response

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neutral stimulus

a stimulus that before conditioning does not naturally bribng about the response of interest

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unconditioned stimulus

stimulus that naturally brings about a particular response without having been learned

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unconditioned response

response that is natural and needs no training

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conditioned stimulus

once neutral stimulus that has been paired with an unconditioned stimulus to bring about a response formerly caused only by the unconditioned stimulus

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conditioned response

response that after conditioning, follows a previously neutral stimulus

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phobias

intense, irrational fears

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extinction

occurs when a previously conditioned response decreases in frequency and eventually disapears

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spontaneous recovery

the reemergence of an extinguished conditioned response after a period of rest and with no further conditioning

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stimulus generalization

process in which after a stimulus has been conditioned, stimuli that are similar to original stimulus produce the same response

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stimulus descrimination

the ability to differentiate b/w stimuli

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operant conditioning

learning in which a voluntary response is strengthened or weakened, depending on the response’s favorable or unfavorable consequences

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law of effect (Thorndike)

states that responses that lead to satisfying consequences are more likely to be repeated

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reinforcement

process by which a stimulus increases the probability that a preceding behavior will be repeated

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reinforcer

any stimulus that increases the probability that a preceding behavior will occur again

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primary reinforcer

satisfies some biological need and works naturally

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secondary reinforcer

stimulus that becomes reinforcing because of its associated with a primary reinforcer

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positive reinforcer

stimulus added to the environment that brings about an increase in a preceding response

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negative reinforcer

refers to an unpleasant stimulus whose removal leads to an increase in the probability that a preceding response will be repeated in the future

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punishment

stimulus that decreases the probability that a prior behavior will occur again

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positive punishment

weakens response by applying an unpleasant stimulus

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negative punishment

consists of the removal of something pleasant

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schedule of reinforcement

pattern of frequency and timing of reinforcement following desired behavior

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continuous reinforcement schedule

behavior is reinforced every time it occurs

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partial reinforcement schedule

behavior is reinforced some, but not all of the time

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fixed ratio schedule

reinforcement is given only after a specific number of responses

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variable ratio schedule

behaviors are reinforced after an average number of responses, when reinforcement will occur is unpredictable

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fixed interval schedule

provides reinforcement for a response only if a fixed time period has elapsed

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variable interval schedule

the time between reinforcements varies around some average rather than being fixed

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stimulus control training

behavior is reinforced in the presence of a specific stimulus but not in its absense

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shaping

process of teaching a complex behavior by rewarding closer approximations of desired behavior

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behavior modification

technique for increasing the frequency of desirable behaviors and decreasing the incidence of unwanted ones

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cognitive learning theory

focuses on how people think

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latent learning

new behavior is learned but not demonstrated until some incentive is provided for displaying it

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observational learning

learning by watching the behavior of another person or model

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encoding

first stage in remembering something