removal or destruction of brain tissue in a surgical procedure
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absolute threshold
intensity level at which one can detect a stimulus 50% of the time
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accommodation
the process of modifying a schema to account for new information; the process of the eyes lens changing shape in order to focus on distant or near objects
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acetylcholine (ACh)
a neurotransmitter involved in learning, memory and muscle movement
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achievement test
a test that assesses what one has learned
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acquisition
a process in classical conditioning by which the association of a neutral stimulus with a natural stimulus is first established
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action potential
the electrical process by which information is transmitted the length of an axon
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activation synthesis
the idea that dreams are the result of the cerebral cortex interpreting and organizing random flashes of brain activity, originating in the lower brain structures, especially the pons
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adrenal gland
source of the hormone norepinephrine which affects arousal
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mood disorders
category of mental disorders characterized by disturbances in mood and emotion
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need for affiliation
desire to associate with others, to be part of a group, to form close and intimate relationships
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after image
an image that remains after a stimulus is removed, especially one in which the colors are reversed
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agonists
drugs which mimic the activity of neurotransmitters
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all-or-nothing
description of the action of neurons when firing
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alpha waves
seen when an individual is in a relaxed, unfocused, yet still awake state
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amygdala
limbic system component associated with emotion, particularly fear and anger
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anal stage
Freud's pychosexual period during which a child learns to control his bodily excretions
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anorexia (nervosa)
an eating disorder in which one starves oneself even though significantly underweight
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antagonist
drug which blocks the activity of neurotransmitters
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anterograde amnesia
loss of memory for events that occur after the onset of the amnesia; eg, see in a boxer who suffers a severe blow to the head and loses memory for events after the blow
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retrograde amnesia
loss of memory for events that occurred before the onset of amnesia; eg a soldier's forgetting events immediately before a shell burst nearby, injuring him
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antisocial personality disorder
psychological disorder in which one demonstrates a lack of conscience
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anvil
the middle of the three ossicles
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aphasia
impairment of language usually caused by damage to the left hemisphere
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arousal
condition in which the sympathetic nervous system is in control
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assimilation
interpreting new experiences in terms of existing schema
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association areas
areas of the cerebral cortex which have no specific motor or sensory repsonsibilities, but rather are involved in thinking, memory and judgment
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associative learning
learning in which an organism learns that certain events occur together, such as my cat knowing that she will be fed when I get home from work
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attachment
theory developed by Harlow; types include secure and insecure
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attitude
a relatively enduring evaluation of a person or thing; doesn't always match behavior
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attribution theory
a way of explaining others' behavior by either one's disposition or one's situation
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auditory canal
the area that sound waves pass through to reach the eardrum
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authoritarian
style of parenting in which the parent creates strict rules for the child and the child has little or no input into determining the rules
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autonomic nervous system
division of the nervous system that control the glands and organs; its divisions arouse or calm
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autonomy vs. shame and doubt
Erikson's stage in which a toddler learns to exercise will and to do things independently; failure to do so causes shame and doubt
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availability heuristic
this cognitive shortcut features the idea that events which are vividly in memory seem to be more common
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axon
extension of the neuron which carries, via an action potential, information that will be sent on to other neurons, muscles or glands
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babbling
stage of language development at about 4 months when an infant spontaneously utters nonsense sounds
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applied research
scientific investigations intended to solve practical problems
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behavioral perspective
perspective on psychology that sees psychology as an objective science without reference to mental states
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belief perseverance
situation in which one's beliefs continue despite the fact that the ground for the beliefs have been discredited
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big 5 personality factors
openness to new experience, conscientiousness, extraversion, agreeableness, neuroticism
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binocular cues
retinal disparity and convergence which enable people to determine depth using both eyes
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biological perspective
perspective that stresses links between biology and behavior
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bipolar cells
eye neurons that receive information from the retinal cells and distribute information to the ganglion cells
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bipolar disorder
mood disorder in one experiences both manic and depressed episodes
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blind spot
point in the retinal where the optic nerve leaves the retina so there are no rods or cones there
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bottom-up processing
analysis that begins with sensory receptors and works its way up to the brain's integration of sensory information
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hemispheres
we have two, right and left, and some brain functions seem to centered in one or the other
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brainstem
oldest part of the brain, beginning where the spinal cord swells upon entering the skull; controls fundamental survival processes like heartrate and breathing
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bulimia nervosa
eating disorder characterized by excessive eating followed by purging
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bystander effect
the tendency to not offer help when needed if others are present who do not offer help
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Cannon-Bard theory
theory of emotion that says that a stimulus causes simultaneously psyiological arousal and the subjective experience of an emotion
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case study
scientific investigation in which a single subject is studied in great detail
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CAT scan
a method of creating static images of the brain through computerized axial tomography
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catatonic schizophrenia
a form of schizophrenia in which the patient has muscle immobility and does not move
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catharsis
release of aggressive energy through activity or fantasy
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central nervous system
consists of the brain and the spinal cord
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cerebellum
brain structure that controls well-learned motor activities like riding a bike
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cerebral cortex
the fabric of interconnecting cells that blankets the brain hemispheres; the brain's center for information processing and control
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shaping
using operant conditioning to teach a complex response by linking together less complex skills
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chunking
organizing units of information into manageable units such as memorizing a phone number as three groups of information 248-555-1212
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circadian rhythm
the daily biological rhythms that occur in a 24-hour period
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classical conditioning
method of learning in which a neutral stimulus can be used to elicit a response that is usually a natural response to a stimulus
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client-centered therapy
developed by Carl Rogers, this humanistic therapy includes unconditional positive regard
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clinical psychology
this type of psychologist studies, assesses and treats those with psychological disorders
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cochlea
this coiled structure in the inner ear is fluid-filled and in it the energy from sound waves stimulate hair cells
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cognitive dissonance theory
this says that we will suffer discomfort and act to change the situation when our thoughts and actions seem to be inconsistent
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cognitive perspective
perspective on psychology that stresses the importance of mental activities associated with thinking, remembering, etc
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cognitive therapy
treatment for psychological disorders that centers on changing self-defeating thinking
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collective unconscious
Jung's theory that we all share an inherited memory that contains our culture's most basic elements
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color blindness
a variety of disorders marked by inability to distinguish some or all colors
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collectivist
this adjective describes cultures in which the individual is less important than the group
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concrete operations
Piaget's stage in which children learn such concepts as conservation and mathematical transformations; about 7 - 11 years of age
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concurrent validity
the extent to which two measures of the same trait or ability agree
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conditioned response
in classical conditioning, the response elicited by the conditioned stimulus
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conditioning
generally, learning in which certain experiences make certain behaviors more or less likely; there are two forms of this
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conduction
one type of hearing impairment caused by mechanical problems in the ear structures
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cones
neurons in the retina that are responsible for color vision
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confirmation bias
a tendency to search for information that supports one's preconceptions
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conformity
adjusting behavior to meet a group's standard
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confounding variable
extraneous factor that interferes with the action of the independent variable on the dependent variable
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consciousness
one's awareness of one's environment and oneself.
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consummate love
includes passion, intimacy and committment
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control group
subjects in an experiment who do not receive application of the independent variable but are measured nonetheless for the dependent variable
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convergent thinking
a type of critical thinking in which one evaluates existing possible solutions to a problem to choose the best one
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cornea
the transparent outer covering of the eye
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corpus callosum
the fibers that connect the right and left hemispheres, enabling them to communicate
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correlation
the degree of relationship between two variables
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correlation coefficient
a positive one near 1.0 indicates two variable are positively related; a negative number indicates a negative relationship; zero indicates no relationship
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cross-sectional study
type of study that measures a variable across several age groups at the same time
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debriefing
giving participants in a research study a complete explanation of the study after the study is completed
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defense mechanisms
Freud's processes by which individuals express uncomfortable emotions in disguised ways
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deindividuation
when an individual seems to lose himself or herself in the group's identity
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deinstitutionalization
moving people with psychological or developmental disabilities from highly structured institutions to home- or community-based settings
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delta waves
largest brain waves, associated with deep, dreamless sleep
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delusion
irrational, highly improbable belief
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dendrite
a branch off the cell body of a neuron that receives new information from other neurons
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denial
a defense mechanism in which unpleasant thought or desires are ignored or excluded from consciousness
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dependent variable
the variable that the experimenter measures at the end of the experiment