Exam 2 Flashcards
anatomy
functions of the parts of the brain
biochemistry
effects of neurotransmitters & hormones on brain processes
dendrites
projections on nerve cells that receive stimulation
axons
pass on stimulation from the nerve cell
afferent nerves
messages travel along these nerves from the body to the CNS via dendrites
efferent nerves
messages travel along these nerves from the body to the CNS via dendrites
interneurons
organize & regulate transmissions between nerve cells (biggest bundle of these is the brain)
hypothalamus
Connected to just about everything else
-Helps coordinate & regulate homeostatic systems
-Secretes several hormones
amygdala
important role in emotion
hippocampus
important in processing memories
cortex
outer layer of the brain
neocortex
outermost layer of the cortex & the most distinctive part of the human brain
frontal cortex
crucial part for uniquely human aspects of cognition (large size)
brain damage
allows us to track problems caused by damage to different parts of the brain
brain stimulation
Directly stimulate the brain to see the impacts on the person
-Difficult to research & relatively rare
-Some methods are growing in popularity
-Mostly in animals, but also conscious people (electrodes in scalp)
TMS & tDCS
Brain stimulation used to create “virtual lesions” (temporarily turn off parts of the brain to see how psychological processes are affected)
brain activity & imaging
Used to observe functioning directly
electroencephalography (EEG)
electrodes on the scalp pick up electrical signals generated by the brain (WHEN brain working)
magnetoencephalography (MEG)
detects magnetic indications of brain activity (provides timing & spatial info)
computed tomography (CT) scans
creates representations of very thin slices of the brain (can examine small structures)
positron emission tomography (PET)
maps brain activity based on blood flow
functional magnetic resonance imaging (fMRI)
map brain activity based on magnetic impulses generated by oxygen in the blood
brain activity imaging that show WHEN the brain is working
-EEG
-MEG
brain activity imaging that show WHERE the brain is active
-CT scans
-PET
-fMRI
Issues with brain imaging
-All parts of the brain are always active to some degree (blood oxygenation level dependent)
-Brain activity in response to a stimulus doesn’t mean the same thing occurs every time that area is active
-Most researchers only look at small areas (neural context effect)
-Tech is difficult & expensive to use
neural context
The activities of individual areas may not mean much in the absence of knowledge about what other areas of the brain are doing simultaneously
amygdala
-Links perceptions & thoughts w/emotional meaning
-Negative & positive emotions
-Assessing whether stimuli is threatening or rewarding
-Detects novelty of stimulus
-Relevant for motivation
frontal lobes & neocortex
-Social & emotional understanding
-Self-control & regulation of impulses/feelings
relevant amygdala traits
anxiety, fearfulness, sociability, sexuality
Phineas Gages
Metal rod through skull, but survived. Personality changed (patience, obstinance, less emotional). Impairment in decision making. Social skills likely rebounded.
“Elliott”
Tumor in midline of brain & had a large portion of the cerebral cortex removed. Became unemotional. Unable to make appropriate decisions due to impairment in ability to use emotional reactions in decision-making.
somatic marker hypothesis
the bodily (somatic) emotional component of thought is a necessary part of problem solving & decision making
emotions enable people to make decisions that maximize good outcomes & minimize bad ones
capgras syndrome
Believe loved ones have been replaced by body doubles following injury to the right frontal lobe. Possibly bc people fail to respond emotionally to their loved ones & conclude they must not be the same people.
anterior cingulate
-Experiencing normal emotions
-Controlling emotional responses & behavior impulses
-Implications for extraversion & neuroticism
prefrontal leucotomy
Damages small areas of white matter behind each frontal lobe => Intended to decrease pathological levels of agitation & emotional arousal
prefrontal lobotomy
removes whole sectors of the frontal lobes
peristence
ability to complete a task in the face of obstacle & in the absence of immediate reward (two areas of the frontal cortex & middle brain behind frontal lobes)
c-system
effortful, reflective thinking about self & others
lateral prefrontal cortex, hippocampus, medial temporal lobe, posterior parietal cortex
x-system
effortless, reflexive social thought
ventromedial prefrontal cortex, amygdala, lateral temporal cortex
neurotransmitters
chemicals that travel across synapses between neurons, causing a chemical reaction that has an excitatory or inhibitory effect
excitatory
fires off a chemical message to the second neuron, which fires
inhibitory
block or prevent chemical message from being passed to second neuron
hormones
biological substances that affect the body in locations different from where they were produced
central nervous system
brain & spinal cord
peripheral nervous system
neuronal networks that extend throughout the body
endorphins
hormones that inhibit neuronal transmission of pain
dopamine
-Responding to rewards & approaching attractive objects/people
-Sociability, general activity level, novelty seeking
-Facilitates exploration, approach, learning
-Relation to Parkinson’s, bipolar, impulsivity
-Behavioral activation system
-Related to plasticity (extraversion & openness)
serotonin
-Inhibition of behavioral impulses
-Related to stability (conscientiousness, agreeableness, emotional stability)
hypothalamus
region of brain that secretes & is involved in regulating hormones
gonads
glands that produce sex hormones
adrenal cortex
outer layer of the adrenal gland that secretes hormones
epinephrine
adrenaline (through body)
norepinephrine
adrenaline in brain
tend-and-befriend
-Female response to stress
-Calm others down & getting people to work together
-Based on evolutionary theory
-Oxytocin is important
testosterone
-10x higher in males
-Complex link to aggression (high levels linked, but not always)
-Fatherhood lowers levels
-Related to sociability, impulsivity, lower inhibition, conformity, stable extraversion
cortisol
-Released in response to stress
-Chronically high levels in those with severe stress, anxiety, depression
-Low levels related to PTSD & sensation seeking
oxytocin
-Mother-child bonding, romantic attachment, & sexual response
-Decreases fearfulness
-Increases perceptions of trustworthiness & attractiveness in others
-Facilitates approach behaviors
extraversion & brain
medial orbital-frontal zortex
Conscientiousness & brain
Middle frontal gyrus
neuroticism & brain
dorsomedial pre-frontal cortex, cingulate gyrus/caudate, medial temporal lobe
agreeableness & brain
superior temporal sulcus, posterior cingulate cortex
eugenics
idea that humanity could be improved through selective breeding
phenotype
observable traits
genotype
genetic structure
heritability coefficient
percentage of variance of a trait in the population that can be attributed to variance in genes
heritability coefficients in twin studies vs. non-twin studies
Twins => .40
Non-twins => .20
molecular genetics
determine whether differences in traits are correlated with differences in a particular gene
gene-environment interactions
genes provide an initial design, but there must be an environment in order for there to be a behavior (environments affect heritability)
genome-wide association studies
look for association between hundreds of thousands of genes/patterns of genes & personality in large samples
epigenetics
experience affects biology; nongenetic influences on a gene’s expression
early-life experiences can influence how or if genes are expressed during development
evolutionary personality psychology assumptions
behavioral patterns developed bc they were necessary for survival
characteristics with more survival value are more likely to appear in future generations
inclusive fitness
tendency to aid & protect people, especially close relatives, to ensure survival of one’s own genes into succeeding generations
sociometer theory
feelings of self-esteem evolved to monitor the degree to which a person is accepted by others
evolution & depression
pain signals that something is wrong & must be fixed
crying as a way to seek social support
fatigue & pessimism may prevent wasting resources
frequency dependent behaviors
adjust according to how common they are
only adaptive as long as only a few people do them
methodology of evolutionary psychology
backward speculation is difficult to empirically test
reproductive instinct
not everyone wants as many children as possible => people don’t have to consciously try to do what is evolutionarily adaptive
conservative bias
current behavioral order was inevitable & is unchangeable & appropriate
human flexibility
people are more flexible than evolution & genetically-determined behavior account for
biological reductionism
everything about the mind can be reduced to biology
free association
patient says whatever comes to mind => get people to talk about difficult topics
psychic determinism
everything that a person thinks & does has a specific cause that can be identified via psychoanalysis
id
irrational & emotional (unconscious)
ego
rational (at least partially conscious)
superego
moral (unconscious)
psychic conflict
one part of the mind being in conflict with another part of the mind
compromise formation
finding a compromise among the different structures of the mind & what the individual wants (ego’s main job)
mental energy
mental or psychic energy used by the mind (amount is fixed & finite)
psychoanalysis controversy
-Too much emphasis on sex & sexual energy
-Deals with things that can’t be seen or proven
-People don’t want to be told why they do certain things
libido
life drive, or sexual drive (creation, protection, enjoyment of life, creativity, productivity, growth)
thanatos
death drive (accounts for destructive activity & to deal with the fact that everyone dies)
doctrine of opposites
everything implies & requires its opposite
psychosexual physical focus
where energy is concentrated & gratification is obtained
psychosexual psychological theme
physical focus & the demands from the outside world
psychosexual adult character type
associated w/being fixated or not psychologically resolved in a stage (troublesome throughout life)
oral stage (birth-18 months)
Physical => Mouth, lips, tongue
Theme => Dependency, passivity
Character types => Overly independent (not fulfilled) vs. passive (fulfilled automatically/quickly)