Biological Approach
- Created by: gracepxx
- Created on: 13-04-16 11:54
Assumption 1
Behaviour explained in terms of different areas of the brain
Research shows different areas of brain persorm specialised functions
If areas are damaged, they loose particular functions
Visual cortexr process visual info - if damaged - unable to see
Hippocampus deals with abilities to form memories - damanged - can't remember events that have happened
Assumption 2
Behaviour explained by hormones
Chemical substances that circulate in blood and only affect target organs
Produced in large quantities but disappear quickly
Effects are slow compared to nervous system but very powerful
Adrenaline released by adrenal glands when an animal is scared or stressed
Results in fight or flight response (increased heart beat, sweat etc)
Biologial response prepares us to cope with stressful situation by fight or flight
Theory - GAS - P1
Selye was doctor who notices patients shared common set of symptoms regardless of particular illness
Led him to propose general adaption syndrome theory
Suggested body produces general response to threat (stressor)
Response is adaptive - enables body to cope with extreme stress
Used word syndrome as it refers to a condition containing identifiable symptoms
Theory - GAS - P2
Proposed body responds to stress in 3 stages
Stage 1 is alarm reaction - perception of stressor leads to a response
In physiological terms - hypothalamus sends signal to adrenal glands and adrenaline released
In behavioural terms - release of adrenaline causes "fight or flight" response - animal is in stage of readiness to deal with sressor by fighting or flight, both of which use energy
Theory - GAS - P3
Stage 2 - resistance
If stress continues, body needs means of coping with demands of the environment
Body maintains (as far as possible) normal internal functions e.g temperature
Despite outwards appearance of coping, internally, the body is being depeleated of resources such as adrenaline
Theory - GAS - P4
Stage 3 - exhaustion
Eventually body can no longer maintain normal functioning
Symptoms associated with adrenaline return - high blood pressure
Immune system may no longer be able to cope because production of necessary proteins (e.g cortisol) is slowed in favour of other needs
End result - person may suffer from stress-related illness such as cardivascular disorder, depression or other physical/psychological illness
Theory - GAS - P5
Selye (1936) demonstrated GAS using rats
Exposed them to variety of unpleasant experiences - extreme cold, drugs, cutting spinal cord
Rats responded with GAS:
First 16-48 hours - physiological triad - englargement of their adrenal glands, ulcers and shrinkage of immune system
Then return to near normal
Within 1-3 months - return of the physiological triad
Therapy - Chemo - P1
Links to assumption that mentally disordered behaviour has a physical, biological cause, such as an inbalance of neurotransmitters, and this can be treated with drugs
Psychoactive drugs are used to treat mental disorders
First developed in 1950s and revolutionised treatment of mental disorders
Allow symptoms to be controlled so patients can conduct relatively normal lives
Therapy - Chemo - P2
Different kinds of chemotherapy
Antipsychotic drugs - treat mental disorders such as schizophrenia - associated with high levels of neurotransmitter dopamine
Conventional antipsychotics block the action of dopamine in the brain by binding to dopamine receptors
Antidepressant drugs - one cause of depression is thought to be insufficient amounts of neurotransmitter serotonin
Drugs aim to increase serotonin levels
SSRIs increase levels by blocking the transporter mechanism that re-absorbs the serotonin into the pre-synaptic cell somore is left in the synapse
Antianxiety drugs - reduce stress & anxiety by slowing down anxiety of nervous system
Beta-blockers (BBs) reduce effect of hormone adrenaline which is released as a response to stress
BBs bind to receptors on cells of the hearts and other parts of body stimulated when person stressed
By blocking receptors it is harder to stimulate cells - hear beats slower
Therapy - Chemo - P3
Chemotherapy associated with side effects
Ferguson et al (2005) - patients taking SSRIs are twice as likely to commit suicide
Kirsch et al (2008) - reviewed trials of SSRIs - only in cases of most servere depression was it advantageous over placebo
Other studies found it was effective, Arroll et al (2005) - found SSRIs were superior to placebos
Evaluation - Strengths - P1
Approach is scientific
Biological explanations have clear variables (hormones) that can be measured, tracked and examined
Research can investigate effect of psychoactive drugs on certain neurotransmitters by measuring the levels of the neurotransmitters
Examples of research are sceintific as they fulfil aims of scientific research - conduct objective, controlled studies to establish causal relationships
Discovery of causal relationships allow us to make predictions about our world
Evaluation - Strengths - P2
Approach is deterministic
Proposed that physical elements of body (hormones) cause identifiable behaviour
High levels of neurotransmitter dopamine suggested as cause of schizophrenia
Evidence from difference sources such as effects of drugs known to increase levels of dopamine and drugs that increase symptoms of schizophrenia (hallucinations)
Evaluation - Weakness - P1
Approach is reductionist
Biological explanations reduce complex behaviour to set of simple explanations
Reducing experience of stress to action of hormone adrenaline or schizophrenia to action of neurotransmitter dopamine
End result may be that we lose an understanding of thing we're investigating by reducing it to most basic components
Suggests schizophrenia is a complex physical-chemical system gone wrong
Others such as R.D Laing take a holist view - explanation at best is incomplete and may prevent us reaching true understanding of behaviour
Evaluation - Weakness - P2
Approach doesn't consider individual differences
Studies a few people & assumes everyones biological system behaves in the same way
Nomothetic approach ignoring differences between individuals
Research tends to use male Ps because female hormone cycles may interfere with research
Research shows men act aggressively to stress whereas women remain calmer because female hormones moderate affects of adrenaline - Taylor et al (2000)
Results in picture we have of behaviour being wrong - doesn't apply equally to all people
Methodology - P1
Brain scanning
Assumes behaviour can be explained in terms of activity in the brain and nervous system so psychologis seek methods that allow them to view brain activity
EEG - electrodes placed on scalp and electrical activity in different regions of brain recorded - however, recording can't indicate precise source of electrical activity
CAT scans - take series of xrays and combrine to form picture of area being scanned
Advantage- high quality xrays, good for tumours
Disadvantage- more radiation than normal xray
fMRI scan - provides both anatomoical and functional information by taking repeated scans of brain in action
Advantage - more detailed and no exposure to radiation
Weakness - take a long time and can be uncomfortable
Methodology - P2
Twin studies
One assumption is the influence of genes on behaviour - units of inheritence passed to us from parents
Twin studies allow us to compare effects of genetics (nature) with effects of experience (nurture)
MZ twins - 100% of genes, DZ twins - maximum of 50% - if behaviour genetic then we would expect MZ twins to be more similar than DZ
Bouchard & McGue (1981) - 86% concordance for intelligence in MZ twins and 60% for DZ - indicates strong genetic component for intelligence
+Strength of study - natural experiment comparing gene influence
-Weakness - Similarities due to shared environment as well as genetics ; newer research revealed that even identical twins have significant genetic differences
MZ twins reared apart - seperates influence of genetics and environment
Bouchard & McGue found 72% concordance for MZ twins reared apart
Continues to show significant genetic contribution to intelligence
+Strength - attempts to control for shared environment
-Weakness - similarities may be due to having been still raised in similar environments as samples are small
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