Behavioral Sciences Flashcards
Franz Gall
phrenology
Pierre Flourens
extirpation (removing parts of brain and measuring behavioral changes)
William James
Functionalism (how mental processes help individuals adapt to their environments)
John Dewey
criticized reflex arc
- believed psych should study organism as a whole as it functioned to adapt to environment
Paul Broca
examined behavioral deficits of people w/ brain damage
- Broca’s area
Hermann von Helmholtz
first to measure speed of a nerve impulse
Sir Charles Sherrington
first inferred existence of synapses
- thought synaptic transmission was electric ->its actually chemical
what are the 3 types of nerve cells and define them
- sensory neurons (afferent neurons) - transmit sensory info from receptors to CNS
- motor neurons (efferent neurons) - transmit motor info from CNS to muscles/glands
- interneurons - b/w other neurons, reflexive behavior
CNS vs PNS
CNS is brain/spinal cord; PNS is nerve tissue and fibers outside of CNS
SNS vs ANS
somatic is voluntary muscles; autonomic is involuntary
what is the order of layers from skin to brain?
skin, periosteum, bone, dura, arachnoid, pia
limbic system
emotion and memory
define functions of the following forebrain structures:
- cerebral cortex
- basal ganglia
- limbic system
- thalamus
- hypothalamus
- cerebral cortex - complex cognitive/behavioral processes
- basal ganglia - movement
- limbic system - emotion and memory
- thalamus - sensory relay station
- hypothalamus - hunger/thirst; emotion
components of midbrain and define functions
- inferior and superior colliculi - sensorimotor reflexes
define the functions of the following hindbrain structures:
- cerebellum
- medulla oblongata
- reticular formation
- cerebellum - refined motor movements
- medulla oblongata - vital functioning (breathing/digestion)
- reticular formation - arousal and alertness
regional cerebral blood flow (rCBF)
noninvasive, detects broad patterns of neural activity based on increased BF to diff parts of brain
computed tomography (CT)
multiple X-rays are taken at diff angles and processed by a computer to cross-sectional slice images of tissue
positron emission tomography (PET)
radioactive sugar is injected and absorbed into body, its dispersion and uptake throughout target tissue is imaged
magnetic resonance imaging (MRI)
uses magnetic field to interact w/ hydrogen and map out hydrogen dense regions of the body
functional magnetic resonance imaging (fMRI)
uses same base as MRI, specifically measures changes associated w/ blood flow
- best for monitoring neural activity
define parts of hypothalamus and their functions
- lateral hypothalamus
- ventromedial hypothalamus
- anterior hypothalamus
- Lateral hypothalamus - triggers eating/drinking
- ventromedial hypothalamus - provides signals to stop eating
- anterior hypothalamus - controls sexual behavior
posterior pituitary
-what two hormones are released from it?
comprised of axonal projects from hypothalamus
- site of release of ADH and oxytocin
what does the pineal gland release? what does that do?
melatonin; regulars circadian rhythms
extrapyramidal system
gathers info about body position and carries it to CNS, but does not function directly through motor neurons
septal nuclei
contain one of the primary pleasure centers in the brain
- mild stimulation is intensely pleasurable
amygdala; what does lesion do?
plays important role in defensive and aggressive behaviors, including fear and rage
- lesions causes relaxation and hypersexual states
hippocampus
plays vital role in learning and memory processes, specifically consolidating info for LTM
gyrus vs sulcus
gyrus is a bump and a sulcus is a fold
broca’s aphasia
inability to produce meaningful speech, but able to comprehend it
parietal lobe
sensory input
- somatosensory cortex
wernicke’s aphasia
produce random speech
dominant vs non dominant hemisphere
dominant is usually left, primary function is language, logic, math
- non dominant is usually right, with a more creative function
ACh
found in CNS and PNS
- used to transit nerve impulses to muscles
catecholamines
- what do they play a role in?
epi, norepi, and dopamine (aka monoamines)
- play important role in experience of emotions
epi/norepi; low/high levels of norepi?
involved in controlling alertness and wakefulness
- involved in fight or flight
- low levels = depression, high levels = anxiety
dopamine; imbalances can cause what?
plays role in movement and posture
- high levels can cause SCZ, low levels cause Parkinsons
serotonin
plays roles in regulating mood, eating, sleeping, rearming
GABA
inhibitory, plays role in stabilizing neural activity
glycine vs glutamate, which is inhibitory and which is excitatory?
glycine is inhibitory while glutamate is excitatory
endorphins
natural painkillers in brain
adrenal medulla vs adrenal cortex
adrenal medulla releases epi/norepi, while the adrenal cortex releases cortisol as well as sex steroids
define neurulation; what does it form?
occurs when ectoderm overlying notochord begins to furrow
- forms neural groove surrounded by 2 neural folds
neural crest
cells at the leading edge of the neural fold
what happens after neurulation?
- what becomes sensory neurons? motor neurons?
- how does the brain form?
remainder of furrow closes to form neural tube, which will form CNS. neural tube has ALAR PLATE, which differentiates into sensory neurons, and BASAL PLATE, which differentiates into motor neurons. neural tube folds on itself to form brain
rooting reflex
automatic turning of head in direction of stimulus that touches cheek
moro reflex
infants react to abrupt movements of their heads by flinging out their arms, then slowly retracting and crying
babinski reflex
causes toes to spread apart automatically when the sole of foot is stimulated
1st year of life
- puts everything in mouth
- goes from sitting w support to crawling
- issues of trust, stranger anxiety
- laughs aloud, repetitive responding
Age 1-2
- walks alone/climbs stairs alone
- hand preference
- kicks/throws ball, pats pictures
- separation anxiety, onlooker play
- greater variation in timing of language dev.
- uses 10 words
Age 2-3
- high activity level
- can turn doorknob/lid
- scribbles w/ crayon
- aim a ball, stand on tip toes
- selfish/self centered
- imitation, recognizes self in mirror
- parallel play
- 2word sentences, uses 250 words
Age 3-4
- rides tricycle
- alternates feet on stairs
- bowel/bladder control
- catches ball, unbuttons buttons
- fixed gender identity
- sex-typed play
- takes turns, knows full name
- complete sentences
- 900 words
- recognizes objects
- strangers can understand
osmoreceptors
respond to osmolarity of blood
absolute threshold
minimum stimulus needed to activate a sensory system
difference threshold (JND)
minimum diff in magnitude b/w 2 stimuli before one can perceive the diff
Weber’s law
there is a constant ratio b/w change in stimulus magnitude needed to produce a JND and magnitude of original stimulus
signal detection theory
changes in our perception of the same stimuli depend on both internal and external context
response bias
tendency of subjects to systematically respond to a stimulus in a particular way due to nonsensory factors
sclera
white of the eye
2 blood vessels in the eye
choroidal and retinal
retina
innermost layer of eye, contains actual photoreceptors that transduce light into electrical info the brain process
cornea
clear, domelike window in front of eye
- gathers and focuses incoming light
iris; 2 parts (pupillae)
colored part of eye
- dilator pupillae and constrictor pupillae
ciliary body
produces aqueous humor, which bathes the choroid and drains into the canal of schlemm
lens
behind iris, helps control refraction of incoming light
what is accomodation (eye)?
ciliary muscle contracts and pulls on suspensory ligaments and changes shape of lens
macula vs fovea
macula is central section of retina and has a high concentration of cones while fovea is centermost point of retina, containing ONLY CONES
order light travels from photoreceptors to optic nerve
rods/cones -> horizontal cells -> bipolar cels -> amacrine cells -> RGCs -> optic nerve
where does info travel before and after LGN?
optic nerve to optic chiasm to LGN to visual cortex and superior colliculus
superior colliculus
controls some responses to visual stimuli and reflexive eye movements
parallel processing
ability to simultaneously analyze/combine info regarding color, shape, and motion
pervo vs magnocellular cells
parvocellular has high color spatial resolution, see fine detail, only work w stationary objects
- magnocelluplar has high temporal resolution and low spatial resolution, provide blurry but moving image of object
tympanic membrane (eardrum)
vibrates in phase w/ incoming sound waves
middle ear
malleus then incus then stapes
eustachian tube
helps equalize pressure b/w middle ear and environment
order of sound in ear
sound -> pinna -> tympanic membrane -> malleus -> incus -> stapes -> oval window -> organ of corti -> basilar membrane -> auditory nerve
round window
membrane-covered hole in cochlea, allows perilymph to actually move within cochlea
auditory pathway
vestibulocochlear nerve -> brainstem -> MGN -> auditory cortex OR superior olive OR inferior colliculus
place theory
location of a hair cell on basilar membrane determines perception of pitch when that hair cell is vibrated
olfactory pathway
odor molecules inhaled -> nasal passage -> olfactory nerves in olfactory epithelium -> olfactory bulb -> olfactory tract -> higher brain regions such as limbic system
papillae
little bumps on the tongue consisting of taste buds
pacinian corpuscles
respond to deep pressure and vibration
meisner corpuscles
respond to light touch
merkel cells
respond to deep pressure and texture
ruffini endings
respond to stretch
free nerve endings
respond to pain and temp.
gate theory of pain
proposes that there is a special “gating” mechanism that can turn pain signals on or off, affecting whether or not we perceive pain
kinesthetic sense (proprioception)
ability to tell where one’s body is in space
perceptual organization
refers to ability to use these 2 processes in tandem with all of the other sensory clues about an object, to create a complete picture or idea
constancy
idea that we perceive certain characteristics of objects to remain the same, despite diff in the environment
gestalt principles
these are ways for the brain to infer missing parts of a picture when a picture is incomplete
law of proximity
elements close to one another tend to be perceived as a unit
law of good continuation
elements that appear to follow in the same pathway tend to be grouped together
subjective contours
perceiving contours, and therefore shapes that are not actually present in the stimulus
law of closure
when a space is enclosed by a contour it tends to be perceived as a complete figure
law of pragnanz
perceptual organization will always be as regular, simple, and symmetric as possible
habituation vs dishabituation
habituation is a decrease in response after repeated exposure, while dishabituation is the recovery of a response to a stimulus after habituation has occurred
which type of reinforcement schedule is the best for learning a new behavior?
variable ratio
latent learning
learning that occurs without a reward but that is spontaneously demonstrated once a reward is introduced
instinctive drift
difficulty in overcoming instinctual behaviors
mirror neurons
neurons located in frontal/parietal lobes and fire when an individual performs an action and when that individual observes someone else performing that action
self-reference effect
we remember info best when we put it in context of our own lives
method of loci
involves associating each item in a list with a location along a route through a building that has already been memorized
peg-word system
associated numbers with items that rhyme with or resemble the numbers
iconic vs echoic memory
iconic is visual and echoic is auditory memory
where is STM primarily housed?
hippocampus
explicit vs implicit memory
explicit is memory that consists of those memories that require conscious recall while implicit consists of our skills and conditioned responses
how can implicit memory be broken up further? define 1. semantic memory
2. episodic memory
- semantic memory is facts that we know
2. episodic memory is our experiences
spacing effect
learning is more effective when study sessions are spaced out
spreading activation
when one word unconsciously activates other linked concepts
serial position effect
higher recall for both the first few and last few items on a list
sundowning
increased dysfunction in the late afternoon and evening often exhibited in alzheimer’s
what causes korsakoff’s syndrome?
a Thiamine deficiency in the brain
agnosia
loss of ability to recognize objects, people, or sounds
proactive vs retroactive interference
proactive is when old info is interfering w/ new learning, and retroactive is when new info causes the forgetting of old info
misinformation effect
observing one thing and then recalling another thing because of false info
source-monitoring error
person remembers details of an event but focuses the context under which the details were gained
long-term potentiation
strengthening of synapses based on patterns of activity
- bases of LTM
dual-coding theory
both verbal associations and visual images are used to process/store info
schema
concept, behavior, or a sequence of events
assimilation vs accommodation
assimilation is the process of classifying new info into existing schemata, while accommodation is the process by which existing schemata are modified to encompass this new info
sensorimotor stage
birth to 2 years; child learns to manipulate environment to meet physical needs
- circular rxns
- object permanence
- representational thought
primary vs secondary reactions
primary is repetition of body movement that originally occurred by chance (sucking thumb), secondary is when manipulation is focused on something outside the body (throwing things from high chair)
object permanence
understanding that objects exist even when out of view
representational thought
child has begun to create mental representations of external objects and events
pre operational stage
2 to 7 years old; symbolic thinking, egocentrism, and internal representations
- thinks INTUITIVELY rather than LOGICALLY
symbolic thinking
ability to pretend, make-believe, and have an imagination
egocentrism
inability to imagine what another person may think or feel
centration
tendency to focus on only one aspect of a phenomenon, or inability understand the concept of conservation
concrete operational stage
7-11 years old; children can understand conservation and conservation perspective of others
- logical thought
- CANNOT think abstractly
formal operational stage
11+ years old; ability to think logically about abstract ideas
Lev Vygotsky theorized that…
the engine driving cognitive development is the child’s internalization of his/her culture
fluid vs crystallized intelligence
fluid is problem solving skills while crystallized is more related to use of learned skills and knowledge
mental set
tendency to approach similar problems the same way
functional fixedness
inability to consider how to use an object in a nontraditional manner
heuristics
simplified principles used to make decisions
when is the availability heuristic used?
when we try to decide how likely something is