Psychology/Sociology Flashcards
absolute threshold
the minimum stimulus intensity to activate response 50% of the time
example: a dog’s absolute threshold for smell may be lower than a human’s
difference threshold
important for detecting small differences in special sense, the difference that is detectable 50% of the time
Weber’s Law
two stimuli must differ by a constant proportion in order for their difference to be perceptible
example: it is harder to tell the difference between a 100 and 101 pound weight than a 1 and 2 pound weight
Signal Detection Theory
How a person detects a signal through the noise, either a hit (present and detected), miss (present and not detected), false alarm (detected but not present), or correct rejection (not detected, not present)
examples: detection of tumor on CT scan
sensory adaptation
when sensory receptors change sensitivity to stimulus
examples: loud sounds, touch, smell, go away after repeated stimulus
Types of sensory receptors
- mechanoreceptors - respond to mechanical disturbances, graded response, examples: Pacinian corpuscles and auditory hair cells
- chemoreceptors - smell and taste
- nociceptors - pain, and referred pain
- thermoreceptors - temperature
- electromagnetic - rods and cones
order of cells on the retina
rods and cones (photoreceptors), bipolar cells, ganglion cells (optic nerve)
myopia
nearsightedness - focal point is before the retina
hyperopia
farsightedness - focal point is behind the retina
feature detection theory
different neurons fire depending on the stimulus, like lines, edges and angles. different areas are activated when looking at different things
parallel processing
everything is processed simultaneously instead of step by step, a holistic approach to sensing, requires large amount of resources
membranes separating sections of ear
tympanic membrane (inner and middle ear) oval window (middle and outer ear) - releases excess pressure
structures important for balance
semicircular canals, utricle and saccule
mechanism of hearing
vibration of tympanic membrane, vibration to bones, vibration to perilymph and endolymph (fluids in cochlea), vibration of basilar membrane, hair cells connected to tectorial membrane, together are known as organ of Corti
auditory cortex
senses sound, located in temporal lobe of brain
hair cells in ear
attached to basilar membrane, have cilia on opposite side of cell that contact tectorial membrane, resulting in bending and firing of afferent neurons
location of olfactory bulb
in temporal lobe near limbic system which is important for memory and emotion
pheromones
chemical signals that cause a social response
kinesthetic sense
proprioception, awareness of self, muscles spindle detect muscle stretch, golgi tendon organs in tendons, joint capsule receptors in joints
vestibular sense
the semicircular canals, utricle, saccule and ampullae, hair cells that detect motion, monitor acceleration and send afferent signals to the pons and cerebellum
Gestalt principles
the whole exceeds the sum of the parts, humans perceive an object rather than a collection of lines
bottom up processing
begins with sensory receptors and word up to complex integration of information in brain (brain uses for sensory receptors)
top down processing
brain applies experience and expectation to interpret sensory information (brain makes assumptions)
selected attention
when one input is attended and the others are tuned out, can have an attended and unattended channel (listening to two different headphones)
Broadbent filter model of selective attention
stimuli are put through a filter where important stimuli enter short term memory and less important ones die out
Anne Treisman’s Attenuation model
accounts for cocktail party effect, instead of a filter mind has an attenuator that turns up or down
divided attention
if and when we can perform multiple tasks at one time
resource model of attention
we have a limited amount of resources to put towards attention, too much and task is not accomplished
depends on task similarity, task difficulty, and task practice
information processing model of cognition
information is processed through a series of steps including attention, perception and storage into memory, minds are like mental computers
assimilation and accomodation
piagets theory of schemas, we either assimilate experiences into our existing schemas or accommodate our schemas to new information
stages of Piagets theory
- sensoriomotor stage - birth to 2, uses senses, gain object permanence
- preoperational stage - 2 to 7, use of symbols and language, are egocentric
- concrete operational stage, 7 to 11, logical and concrete thought, principle of conservation
- formal operational stage, 12 to adult, abstract and moral reasoning
cognitive changes in late adulthood
- decline in recall, recognition intact
- timed based task decline
- slower reaction times
recall vs. recognition
recall - retrieving information without clues, recognition - with clues (identifying a suspect on own or from a line up)
role of culture in cognitive development
individual and enviornment are in reciprocal relationship, example - expression of thoughts is limited by language
lobe of brain for executive functions like planning and organizing
frontal
lobe of brain for formation of new memories
hippocampus
lobe of brain for emotion
amygdala and limbic system
types of problem solving
- trial and error
- algorithm - step by step procedure
- heuristics - mental shortcuts
confirmation bias
only search for information that confirms our preconceived thinking, more likely to only view a problem one way
fixation
barrier of problem solving, inability to gain a fresh perspective, fixed on mental set even though it may not apply
functional fixedness
tendency to perceive the function of objects as fixed and unchanging
representative heuristic
tendency to judge the likelihood of an event occurring based on typical mental representations
example: more afraid of shark attack because its more scary even though it is less likely
availability neuristic
tendency to make judgements based on availability of information in our memories
example: watching violent crime on news, think violent crime will spread to your neighborhood
belief bias
instead of using logic, judge based on beliefs
belief preserverance
tendency to cling to previously held belief
overconfidence
overestimation of accuracy of knowledge and judgements
example: if you hear test was easy and someone finished quickly, you think you will do better
theories of intelligence
G factor - general intelligence (Spearman) 8 types of intelligence (Gardner) Triarchic intelligence (Sternberg) Emotional intelligence
reticular formation
structures for maintaining alertness
polysomnography
used to measuring physiologic sleep
stages of sleep
Stage 1 - theta waves, low intensity, low frequency, fleeting thoughts
Stage 2 - K complexes and sleep spindles, decreased HR and respiration
Stage 3 - slow wave sleep, delta waves, deep sleep
Stage 4 - REM sleep, beta waves (like awake, pysiolocially appear to be awake but there are no muscle movements
sleep cycles
stages 1,2,3,4 in sequence, then back then into REM = 90 minutes
circadian rhythm
24 hour clock, temp rises in morning then falls in afternoon for sieasta
somnambulsim
sleepwalking, during slow wave sleep (3)
night terrors
during stage 3 sleep, not REM so it is not remembered
barbituates
depress sympathethic nervous system
opiates
reduce pain by mimicking endorphins
stimulants
increase neurotransmitter uptake or prevent degradation, dopamine, serotonin and norepinephrine
nucleus accumbens
pleasure center of the brain
encoding
process of transferring sensory information into our memory systems, working memory into long term memory
processes the aid in encoding
mnemonic
rehearsal - phonological loop
chunking - using discrete groups of data (parts of telephone number)
hierarchies
depth of processing
information thought at a deeper level is remembered better, general plot is easier to remember than details
dual coding hypothesis
easier to remember words with images than just words alone
iconic memory
brief photographic memory that decays quickly
echoic memory
memory for sound, lasts 3-4 seconds
brain regions for short term and working memory
short term = hippocampus
working = prefrontal cortex
Implicit or procedural memory
conditioned associations and knowledge of how to do something (having the muscle memory to shoot a basketball)
explicit or declarative memory
being able to declare or voice what is known (explaining how to shot a basketball)
episodic vs semantic memory
facts vs experiences
spreading activation
retrieval of information from one node may lead to activation of surrounding nodes as well, explains hints and context clues
priming
prior activation of nodes for the retrieval of information, context clues help, like you would be less likely to recognize a teacher if you saw them at a store
mood dependent memory
what we learn in one state is most easily recalled when we are again in that state
prospective memory
remembering what to do in the future, declines in older adults