Psych/Soci Flashcards
Parasympathetic Nervous System (PNS) activation
“rest and digest”
- pupils constrict
- saliva stimulated
- constricts bronchii
- heart rate slows
- blood pressure lowers
- digestive peristalsis and secretion stimulated
- bile release stimulated
- contracts bladder
Sympathetic Nervous System (PNS) activation
“fight or flight”
- pupils dilate
- saliva inhibited
- relaxes bronchii
- heart rate increases
- blood pressure increases
- peristalsis and secretion inhibited
- glucose production and release stimulated
- release of epi + norepi from adrenal glands
- bladder inhibited from contraction
- orgasm stimulated
Hindbrain
cerebellum, medulla oblongata, pons, reticular formation
Midbrain
superior and anterior colliculi
Forebrain
Thalamus, hypothalamus, cerebral cortex, basal ganglia, limbic system
Thalamus function
relay system for sensory information
Hypothalamus function
maintains homeostasis and integrates with the endocrine system through the hypophyseal portal system that connects it with the anterior pituitary
Basal ganglia function
smooths movements and helps maintain postural stability
Limbic system (parts + function)
Amygdala - fear and agression
Hippocampus - memory storage
Septal nuclei - pleasure seeking
Fornix - communication with the limbic system
Frontal lobe function
Executive function, impulse control, long-term planning (PFC), motor function (primary motor cortex), speech production (Broca’s Area)
Parietal lobe function
Sensation of touch, pressure, temperature, and pain (somatosensory cortex), spatial processing, orientation, and manipulation
Occipital lobe function
Visual processing
Temporal lobe function
Sound processing (auditory cortex), speech perception (Wernicke’s area), memory, and emotion (limbic system)
Acetylcholine
Voluntary motor control, parasympathetic nervous system, attention, alertness
Epinephrine and norepinephrine
Fight-or-flight responses wakefulness, alertness
Dopamine
Smooth movements, postural stability
Serotonin
Mood, sleep, eating, dreaming
GABA
Brain “stabilization”; major inhibitory neurotransmitter
Endorphins
Natural painkillers
Sensation pathway
Sensory receptors respond to stimuli and trigger electrical signals; sensory neurons send impulses to the CNS, where the signals are transmitted to projection areas in the brain for further analysis.
Weber’s law
The just-noticeable-difference for a stimulus is proportional to the magnitude of the stimulus
Signal detection theory
The effects of nonsensory factors, such as experiences, motives, and expectations, on perception of stimuli (hit, miss, false alarm, correct rejection)
Adaptation
A decrease in response to a stimulus over time
Visual pathway
retina –> optic nerve –> optic chiasm –> optic tract –> LGN –> visual radiations –> visual cortex
Cochlea
Detects sound
Uticle and saccule
Detect linear accleration
Semicircular canals
Detect rotational acceleration
Auditory pathway
cochlea –> vestibulocochlear nerve –> MGN –> auditory cortex
Smell
Detection of volatile or aerosolized chemicals by olfactory chemoreceptors –> olfactory nerves
Taste
Detection of dissolved compounds by taste buds in papillae
Somatosensation
Four touch modalities - pain, pressure, vibration, temperature
Kinesthetic sense (proprioception)
Ability to tell where one’s body is in space
Bottom-up processing
recognition of objects by parallel processing and feature detection; slower but less prone to mistakes
Top-down processing
recognition of an object by memories and expectations, with little attention to detail; faster but more prone to mistakes
Gestalt principles
Ways the brain can infer parts of an image when it is incomplete: Proximity, Similarity, Continuity, Closure, and Connectedness
Habituation
The process of becoming used to a stimulus
Dishabituation
Occurs when a second stimulus intervenes, causing a resensitization to the original stimulus
Observational learning
the acquisition of behavior by watching others; mirror neurons
Associative learning
pairing together stimuli and responses, or behavior and consequences; includes classical and operant conditioning
Reinforcement vs Punishment
Reinforcements increase a behavior, punishments decrease it
Awake
Beta and alpha waves; able to perceive, process, access, and express information
Sleep Stage 1
Theta waves; light sleep
Sleep Stage 2
Theta waves with sleep spindles and K-complexes
Sleep Stage 3/4
Delta waves; slow wave sleep with dreams, declarative memory consolidation, some sleep disorders
REM
Mostly beta waves; apears physiologically awake but dreams, is paralyzed; procedural memory consolidation, some sleep disorders
Dyssomnias vs Parasomnias
Dys = amount or timing of sleep; para = odd sleep behavior
Drug addiction (neuro basis)
Mediated by mesolimbic pathway which includes NAcc, VTA, and medial forbrain bundle with dopamine as the major NT
Depressants
alcohol, benzos, barbituates; sense of relaxation and reduced anxiety
Stimulants
caffeine, cocaine, amphetamines, ecstasy; increased arousal
Opiates/opiods
heroin, meth, opium, pain pills; decreased reaction to pain, euphoria
Hallucinogens
LSD, peyote, mescaline, ketamine, psilocybin; distortions of reality and fantasy; introspection
Sensory Memory
< 1 sec; the ability to retain impressions of sensory information after the original stimuli have ended
Short term memory
15 - 30 seconds, capacity about 7 items; capacity for holding, but not manipulating, a small amount of information in mind in an active, readily available state
Working memory
The part of short-term memory that is concerned with immediate conscious perceptual and linguistic processing
Explicit/Declaritive Memory
Conscious long term memory; consists of episodic memory for events, experiences and semantic memory for facts and concepts
Implicit/Procedural Memory
Unconscious long term memory; consists of memory for skills and tasks
Semantic Network
Facts are stored in these and often retrieved based on priming interconnected nodes.
Piaget’s Stages of Cognitive Development
Sensorimotor (birth to 2) - manipulating environment to meet physical needs through circular reactions; learn object permanence
Preoperational (2 to 7) - symbolic thinking and egocentrism, as well as centration
Concrete operational (7 to 11) - understanding feelings of others and manipulating concrete objects
Formal operational (11 and up) - abstract thought and problem solving
Deductive reasoning
Deriving conclusions from general rules
Inductive reasoning
Deriving conclusions from evidence
Selective attention
allows one to pay attention to a particular stimulus while determining if additional stimuli require attention in the background
Divided attention
uses automatic processing to pay attention to multiple activities at one time
Wernicke’s Area
Language comprehension; damage results in Wernicke’s aphasia (fluent, nonsensical language without comprehension)
Broca’s Area
Language production; damage results in Broca’s aphasia (nonfluent language where every word takes great effort)
Arcuate fasciculus
Connects Wernicke’s and Broca’s areas; damage results in conduction aphasia (inability to repeat words despite intact speech generation and comprehension)
Extrinsic motivation
Motivation coming from external circumstances