module 2 Flashcards
(61 cards)
genetics as a biological influence
- behaviour, personality, intelligence are polygenic and all of which are influenced by environment
- specific genes/small groups of genes are associated with certain psychological disorders
- genetic factors account for less than 50% of the variability in most psychological disorders
p factor study
- longitudinal study lasting 20 years, followed 1000 NZ, between 18-38, and continually assessed them and their mental disorders
- 3 factor model fit the data:
1. internalizing vulnerability to depression and anxiety
2. externalizing vulnerability to antisocial and substance use disorders
3. a thought disorder vulnerability for symptoms of psychosis
p factor psychopathology
can account for the presence or absence of psychiatric symptoms and can give you information about someone’s predisposition for developing all psychopathology
high p
- worse score of severity and duration of disorder and comorbidity and impairment functioning
- more likely to develop a psychological disorder, have multiple, etc
- not purely genetic but some aspects in your environment can raise or elevate your p factor
diathesis
- innate predisposition, meaning you are already at risk of developing a disorder
- e.g. biological, sociocultural and psychological factors
stressors
- triggers the onset of the disorder
- individuals that have a higher diathesis, require less of a stressor and vice versa
diathesis-stress model
discusses how psychological disorders can be caused by both nature and nurture
gene-environment model (bio influence)
- genetic vulnerabilities increase probability of experiencing stressful life events that can trigger a disorder
- genes that predispose you to alcoholism can also predispose you seek out certain environments and situations that trigger the onset of a disorder
epigenetics and “inheritance” or behaviour (bio influence)
- genes appear to be turned on or off by cellular material located on or around the genome
- stress, nutrition, and other factors can affect this epigenome, which gets passed down through generations
- environmental manipulations can override these inherited tendencies towards undesirable behaviours or emotional reactions
- mice & cherry blossom study
neuroscience as a biological influence
- central nervous system (CNS)
- peripheral nervous system (PNS)
- automatic nervous system (ANS)
CNS as a bio influence
- brain and spinal cord
- processes information received from all senses and reacts accordingly
- the brain uses 100 billion neurons and neurons involved in psychopathology
PNS as a bio influence
- somatic nervous system: muscles and voluntary movement; under conscious control
- autonomic nervous system: involuntary bodily functions like heart rate, respiration
- sympathetic nervous system: mobilizes your body to respond to a threat, stress or danger (high HR)
- parasympathetic nervous system: calms you down (low HR)
the brain as a bio influence
- hindbrain: involved in basic involuntary actions/keeps you alive
- midbrain: where sensory input happens
- forebrain: everything above the midbrain
thalamus
involved in emotion regulation and behaviors
the limbic system as a bio influence
- plays a large role in psychopathology, impulse control, emotion regulation and basic drives (sex, hunger)
- contains: thalamus hypothalamus, amygdala and hippocampus
hypothalamus
four f’s:
1. fighting
2. fleeing
3. feeding
4. mating
amygdala
agression, sex drive, and detection of threats
hippocampus
memory
neurotransmitters as bio influences
- agonist: mimic and/or increase the effects of a NT
- antagonist: inhibit or block the effects of a NT
- reuptake inhibitor: blocks the NT from returning to the axon = pooling in synaptic cleft
2 types of NT’s
amino acids and monoamines
amino acids
- glutamate: excitatory, possible link to schizophrenia
- gama aminobutyric acid (GABA): inhibitory, reduces anxiety, aggression
monoamines
- norepinephrine: fight-or-flight
- serotonin: modd, appetite, sleep, memory
- dopamine: reward & motor control, addictions, exploratory behaviour, pleasure-seeking
psychosocial influences - brain structure and function treatment strategy
- target either brain or environment and we will be able to determine the cause of the disorder
- effect of treatment does not imply a/the cause but can imply clues
psychosocial influences - therapy and brain activity
- what’s the best treatment for circuitry, therapy, surgery or drugs?