Behavioural Sciences Flashcards
Where does the parasympathetic nervous system synapse, and what neurotransmitter does it use?
Close to the target organ
Acetylcholine is used at both synapses
Where does the sympathetic nervous system synapse, and what neurotransmitter does it use?
Near the spine between T1 and L2/L3
Preganglionic neurons release ACh and postganglionic release norepinephrine
Medulla oblongata
Breathing, heart rate, blood pressure (vital functions)
Pons
Primarily relay of sensory and motor information
Cerebellum
Posture, balance, coordinates body movements
Bumps on the back of the midbrain:
Superior colliculi: visual sensory info relay
Inferior colliculi: auditory sensory info relay
Telencephalon
Cerebral cortex, basal ganglia, limbic system
Diencephalon
Thalamus, hypothalamus, posterior pituitary gland, pineal gland
Thalamus
Relay for all senses except smell
Extrapyramidal motor system
Gathers information about body position (proprioception) and carries to CNS
Septal Nuclei (limbic system)
One of the primary pleasure centres in the brain
Amygdala
Aggressive behaviour, fear and rage
Hippocampus
Learning and memory, long term memory consolidation
Prefrontal cortex
Manages executive function, supervises processes involved with perception, memory, emotion, impulse control, and long-term planning
Association area
Integrates inputs from diverse brain regions
Projection areas
Sensory processing areas
Broca’s area
Speech production (frontal lobe)
Wernicke’s area
Language comprehension (temporal lobe)
Catecholamines
Epinephrine, Norepinephrine, Dopamine - synthesized from tyrosine
Neurulation
- Begins at 3-4 weeks’ gestational age
- ectoderm overlaying the notochords begins to furrow - forms a neural groove surrounded by two neural folds, furrow closes and forms the neural tube (becomes the CNS)
alar plate become sensory neurons
basal plate becomes motor neurons
Endoderm
The lining of the digestive tract (epithelial cells), lungs, urinary bladder, stomach, colon, liver, pancreas
Mesoderm
Skeletal muscle, bones, circulatory system, connective tissue, adipose tissue, dermis
Ectoderm
CNS, PNS, epidermis, hair, nails, lens of the eye
Rooting reflex
Infant turning of the head toward a stimulus that touches its cheek
Moro reflex
Infants react to abrupt movements of the head by flinging out their arms, then slowly retracting their arms and crying - normally gone by 4 months
Babinski reflex
Toes spread apart when sole of foot is stimulated
Weber’s law
States that there is a constant ratio between the change in stimulus magnitude needed to produce a jnd (just noticeable difference) and the magnitude of the original stimulus
A ratio/percent rather than a numerical value (jnd)
Catch trial
Signal is presented
Noise trial
Signal is not presented
Absolute threshold
Minimum intensity of a stimulus we can sense (not necessarily perceive)
Pathway light travels through the eye
Cornea (focuses light) - anterior chamber - iris - posterior chamber - lens - vitreous humour - retina
Optic chiasm
Nasal optic nerve fibers cross, lateral fibers continue and meet up with decussated nasal fibers to form the optic tract
Visual pathway
Optic nerve - optic chiasm - optic tract - Lateral Geniculate Nucleus of Thalamus - visual cortex
- also inputs to superior colliculus
Parvocellular cells
Detect shape, have very high colour spatial resolution
Magnocellular cells
Detect motion, have high temporal resolution
Pathway of sound (ear structures)
Pinna (auricle) - external auditory canal - tympanic membrane (eardrum) - ossicles (malleus [hammer], incus [anvil], stapes [stirrup]) - oval window or round window - membranous labyrinth (cochlea, vestibule, semicircular canals)
Vestibule
Utricle and saccule are sensitive to linear acceleration
Detected by hair cells covered in otoliths that resist motion as body accelerates - bending - signal
Semicircular canals
Sensitive to rotational acceleration, sensed in the ampulla by hair cells
Hearing
Organ of corti bathed in endolymph and composed of thousands of hair cells sense vibrations and relay signal to brainstem via vestibulocochlear nerve
Ascend to medial geniculate nucleus then to auditory cortex - or superior olive (sound localization) - or inferior colliculus (startle reflex)
Pacinian corpuscles
Respond to deep pressure and vibration (fires when pressure is first administered and when it is removed)
Meissner corpuscles
Respond to light touch (fire when touch is first administered and when it is removed)
Merkle discs
Respond to deep pressure and texture (fire to constant pressure)
Ruffini endings
Respond to stretch (fire to constant pressure)
Free nerve endings
Respond to pain and temperature
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
Spinal cord can preferentially forward signals from other modalities (pressure, temp)
Sensory adaptation
Change over time in responsiveness to the sensory system to a constant stimulus
Bottom-up processing
Object recognition by parallel processing and feature detection, first time we experience something (we don’t have anything to compare it to)
Top-down processing
Driven by memories and expectations, allows us to quickly recognize objects without recognizing their specific parts
Gestalt principle
a) law of proximity
b) law of similarity
c) law of good continuation
d) subjective contours
e) closure
There are ways for the brain to infer missing parts of a picture when a picture is incomplete
a) law of proximity: elements close to one another tend to be perceived as a unit
b) law of similarity: objects that are similar tend to be grouped together
c) law of good continuation: objects that appear to follow the same path tend to be grouped together
d) subjective contours: perceiving contours and, therefore, shapes that are not actually present in the stimulus
e) closure: when a space is enclosed by a contour it tends to be perceived as a compete figure
Law of prägnanz
Perceptual organization will always be regular, simple, and symmetrical as possible
Habituation
A decrease in response due to continued exposure to a stimulus
Dishabituation
Temporary recovery of a response to the original stimulus due to a second stimulus
Conditioned stimulus
Normally neutral stimulus that, through association, now causes a reflexive response called a conditioned response
ex. the bell in Pavlov’s experience became a conditioned stimulus, salivating the conditioned response
Classical conditioning
Taking advantage of a reflexive, unconditioned stimulus to turn a neutral stimulus into a conditioned stimulus
Generalization
A broadening effect, by which a stimulus similar enough to the conditioned stimulus can also produce the conditioned response
Discrimination
Organism learns to distinguish between two similar stimuli
Operant Conditioning
a) positive reinforcers
b) negative reinforcers
operant conditioning - links voluntary behaviours with consequences - BF Skinner (behaviourism)
a) positive reinforcers: increase a behaviour by adding a positive consequence (ex. money)
b) negative reinforcers: increase the frequency of a behaviour by removing something unpleasant
reinforcements always increase the frequency of the behaviour
Escape learning
Role of behaviour is to reduce the unpleasantness of something that already exists (ex. taking an aspirin), a negative reinforcer
Avoidance learning
Prevent the unpleasantness of the something that is yet to happen, negative reinforcer
Primary reinforcer
A naturally positive reinforcer (ex. a dolphin getting a fish)
Secondary reinforcer
A conditioned reinforcer (ex. clicker now associated with the dolphin getting a fish)
Operant conditioning
a) positive punishment
b) negative punishment
a) adds an unpleasant consequence in response to a behaviour to reduce that behaviour (ex. arrest for stealing)
b) reduction of a behaviour when a stimulus is removed, ie. something enjoyable is taken away (ex. privilege of tv is taken away to prevent a behaviour)
punishments are always to prevent a behaviour
Variable-ratio schedule
Reinforce a behaviour after a varying # of performances of the behaviour
- works the fastest (compared to fixed-ratio, fixed-interval, or variable-interval)
- also most resistant to extinction
- Very Rapid and Very Resistant to extinction
Shaping
Process of rewarding increasingly specific behaviours (building up to a more complex task)
Latent learning
Learning that occurs without a reward, but that is spontaneously demonstrated once a reward is introduced
a) Preparedness
b) Instinctive drift
a) preparedness: an organisms predisposition to certain behaviours that make them easier to condition
b) instinctive drift: the opposite, the difficulty in overcoming instinctual behaviours (trying to get a racoon to put money in a piggie bank)
Mirror neurons
Located in the frontal and parietal lobe, fire when one performs an action OR watches someone else perform the same action, connected with observational learning
Controlled processing vs. Automatic processing
Controlled processing = effortful (like studying, flashcards, notes, etc)
Automatic processing = just going about regular day, what one notices
Both associated with encoding memories
Self-reference effect
We tend to recall information best when we put it into context of our own lives
A form of semantic encoding (putting info into a meaningful context)
Memory techniques
a) mnemonics
b) method of loci
c) peg-word
d) chunking
a) mnemonics - rhyming, acronyms
b) method of loci - assigning an item to a location (walking through house each room has an item of grocery list)
c) list that is then associated with items to be memorized
d) organize into meaningful chunks
Short term memory
Usually only lasts ~30 seconds unless attended to, 7 plus or minus 2 rule
Working memory
Used to do things like math in our heads
Few pieces of info in our conscience simultaneously
Elaborative rehearsal
Association of new information with previously stored information, way of adding something to long-term memory
Implicit memory vs. Explicit memory
Implicit memory: procedural or non-declarative, skills and conditioned responses
Explicit memory: declarative memories, divided into semantic (facts) and episodic
Spacing effect
Information is retained better if there is a longer period of time between sessions or relearning
Priming
Recall is aided by being presented with a word or phrase that is close to the desired semantic memory
Context effect vs. State-dependent memory
memory is aided by being in the physical location where encoding took place
remember things better when in the same mental state as when they were encoded (ex. intoxicated)
Serial position effect
More likely to remember the first (primacy effect) and last items on a list (recency effect)
Confabulation
process of creating vivid but fabricated memories
a symptom of Korsakoff’s syndrome along with retrograde amnesia and anterograde amnesia
Proactive interference vs. Retroactive interference
proactive interference: old information is interfering with new learning
retroactive interference: new information causes forgetting of old information
(it is what is forgotten that/ interfered with that describes it)
Prospective memory
Remembering to perform a task at some point in the future, elderly people have the most trouble with this type of task
Source amnesia
Forgetting where the memory came from (might be someone else’s story viewed as ones own)
Synaptic pruning
As we grow older, weak neural connections are broken while strong ones are bolstered
Long-term potentiation
Process by which repeated stimulation of a neuron causes a stronger synaptic connection, receptor sites on the post-synaptic neuron increase, such as the process of how we learn
Piaget’s stages of cognitive development
a) sensorimotor
b) preoperational
c) concrete operational
d) formal operational
Sensorimotor stage
0 to ~2 years
learn to manipulate environment in order to meet needs
stage ends with development of object permanence (beginning of representational thought)
Preoperational stage
~2 to ~7 years
symbolic thinking - ability to pretend
egocentism - inability to imagine what another person may think or feel
centration - tendency to focus on only one aspect of a phenomenon (ex. same quantity of pizza on two plates, but one is cut in two, child will take the one with two)
Concrete operational stage
7 to 11
- concrete thinking
- can consider perspective of others
Formal operational stage
starts at 11
- ability to think logically about abstract ideas
Adaptation
Process by which Piaget thought new information was processed
New information is placed into new schemata
Occurs through assimilation (classifying new info into existing schemata) or accommodation (modifying existing schemata to encompass the new info)
Fluid intelligence
Problem solving, peaks in early adulthood
Crystallized intelligence
Learned skills and knowledge, peaks in late middle adulthood
Delirium
Rapid fluctuation in cognitive function that is reversible and caused by medical causes (nonpsychological) ex. low pH, infection, low blood sugar, etc
Mental set
The tendency to approach problems in the same way, framework for thinking about a problem
Functional fixedness
The inability to consider to use an object in a nontraditional manner
Deductive (top-down) reasoning
Deducing from a set of general rules and drawing conclusions from the information given, formal logic, conclusion is certain
Inductive (bottom-up) reasoning
Seeks to create a theory via generalizations, conclusion is probable
Heuristics
Rules of thumb
Base rate fallacy
Using prototypical or stereotypical factors while ignoring actual numerical information
Disconfirmation principle
When a potential solution to a problem fails during testing, it should be discarded, sometimes confirmation bias prevent one from doing so
Sleep stages and EEG waves associated
Complete cycle of stages lasts ~ 90 minutes
Stage 1: theta waves
Stage 2: theta waves, sleep spindles, and k complexes
Stage 3 and 4: delta waves - slow wave sleep (associated with cognitive recovery, memory consolidation [declarative], and increased GH release) - predominates at the beginning of the night
REM: predominates later in the night
Dreams & Theories
a) activation-synthesis theory
b) problem-solving dream theory
c) cognitive process dream theory
70% of dreams occur during REM
a) activation-synthesis theory: dreams caused by widespread, random activation of neural circuitry - can mimic incoming sensory info, access memories/desires
b) problem-solving dream theory: dreams are a way to solve problems while asleep
c) Cognitive process dream theory: dreams are the sleeping counterpart of consciousness
Dyssomnias:
Insomnia:
Narcolepsy:
Sleep Apnea:
Dyssomnias: disorders that make it difficult to fall asleep, stay asleep, or avoid sleep
Insomnia: difficulty falling asleep or staying asleep
Narcolepsy: lack of voluntary control over sleep onset (symptoms: cataplexy [loss of muscle control and sudden REM during waking hours], sleep paralysis, hypnagogic and hypnopompic hallucinations [hallucinations when going to sleep or awakening]
Sleep Apnea: inability to breath during sleep
Parasomnias:
include?
Parasomnias: abnormal movements or behaviours during sleep
night terrors and sleep walking
Sleep deprivation
Can occur after just one night of no sleep or from many nights of poor quality sleep, when permitted to sleep normally after sleep deprivation will exhibit REM rebound, earlier onset and greater duration of REM sleep
Benzos, barbiturates, alcohol
All depressants, increase GABA activity causing hyperpolarization of neurons via chloride channel activation
Amphetamines
Cause increased release of dopamine, NE, and serotonin at the synapse and decrease their reuptake
Cocaine
Decreases reuptake of dopamine, NE, and serotonin, anesthetic and vasoconstrictive properties
Opiates vs opioids
Opiates = naturally occurring (morphine and codeine) Opioids = semisynthetic derivatives (oxycodone, hydrocodone, heroin)
Bind opioid receptors in peripheral and CNS causing decreased rxn to pain & sense of euphoria
Marijuana
THC binds cannabinoid receptors, glycine receptors, and opioid receptors
Increases GABA activity and dopamine activity
Stimulant, depressant, and hallucinogen
Drug addiction - mesolimbic reward pathway
Include nucleus accumbens, ventral tegmental area, medial forebrain bundle, dopaminergic pathway
Cocktail party phenomenon
When engaged in a convo, if we hear our name mentioned across the room we somehow perk up
Defines selective attention: we pay attention to one thing while other stimulus is processed in the background
Only if important is it brought to our attention
Phonology: Morphology: Semantics: Syntax: Pragmatics:
Phonology: actual sound of language - phonemes (categorical perception - separating phonemes from other sounds)
Morphology: structure of words (morphemes - building blocks
Semantics: association of meaning with a word
Syntax: how words are put together to form sentences
Pragmatics: dependence of language on context and pre-existing knowledge (prosody - rhythm, cadence, inflection)
Language development: 9 to 12 months: 12 to 18 months: 18 to 20 months: 2 to 3 years: 5 years:
9 to 12 months: babbling
12 to 18 months: about one word per month
18 to 20 months: “explosion of language” and combining words
2 to 3 years: longer sentences (3 words or more)
5 years: language rules largely mastered
Language development theories
Nativist (biological) Theory:
Learning (behaviourist) Theory:
Social Interactionist Theory:
Nativist (biological) Theory: existence of some innate capacity for language, believe in critical period for language acquisition b/w 2 years and puberty
Learning (behaviourist) Theory: operant conditioning through reinforcement of proper phoneme usage
Social Interactionist Theory: language acquisition is driven by the child’s desire to communicate
Whorfian hypothesis or linguistic relativity hypothesis
Suggests that our perception of reality - the way we think about the world - is determined by the content of language
Broca’s aphasia:
Wernicke’s aphasia:
Conduction aphasia:
Broca’s aphasia: inability to produce spoken language - telegraphed speech - aware their speech is lacking
Wernicke’s aphasia: unaware their speech is lacking (agnosia), paraphasia, word salad
Conductive aphasia: severing of arcuate fasciculus - can produce and comprehend language, but cannot repeat back or read out loud
Instinct theory
Theory of motivation in which humans are driven to do certain behaviours based on evolutionarily programmed instincts (instinct - innate, fixed pattern of behaviour in response to stimuli. It may be consistent throughout life, or it may appear or disappear with time)
Arousal theory
Theory of motivation that postulates that people perform actions in order to maintain an optimum level of arousal
Viewed as a curve, in which too much or too little arousal reflects poorly on performance
Drive reduction theory
Theory of motivation that postulates that motivations is based on the goal of eliminating uncomfortable states
Primary drives vs secondary drives
Primary drives are those that motivate us to sustain necessary biological processes. Secondary drives are those that motivate us to fulfill nonbiological (usually emotional) desires
Yerkes-Dodson law
Graph of arousal theory, in which optimal performance is based on arousal of not too much or too little