Understanding the EDUQAS Psychology Biological Approach

Core Assumptions of the Biological Approach

Ever wondered why you act the way you do? The biological approach reckons it's all down to evolution, brain structure, and chemicals floating around in your head.

Evolutionary influences suggest that behaviours helping us survive get passed down through generations. Think about how parents will do absolutely anything to protect their children - this altruistic behaviour exists because it helped our ancestors' genes survive and spread.

Your brain isn't just one big blob - different areas have specific jobs through localisation of brain functions. The frontal lobe handles your creativity and personality, whilst the temporal lobe processes memory and hearing. When things go wrong in specific areas, you get predictable problems like Broca's area damage (can't speak but understand) or Wernicke's area damage (can speak but it's complete gibberish).

Neurotransmitters are the brain's chemical messengers that make everything work. Too little serotonin leads to depression and sleep problems, whilst too much dopamine is linked to schizophrenia. It's like having the wrong fuel mixture in your car - everything starts running badly.

Quick Tip: Remember that neurons communicate at synapses using chemical messengers, not electrical signals between cells.

Drug Therapy in Practice

Struggling with mental health? There's probably a drug designed specifically to tackle your brain's chemical imbalance - and they actually work pretty well.

Anti-psychotics treat conditions like schizophrenia by blocking dopamine receptors in your brain. Conventional anti-psychotics tackle positive symptoms (like hallucinations), whilst atypical anti-psychotics like Clozapine cause fewer nasty side effects like tardive dyskinesia.

Anti-depressants, especially SSRIs like Prozac, work by stopping enzymes from breaking down serotonin - basically keeping more of the 'happy chemical' floating around your brain. Anti-anxiety drugs like benzodiazepines (Valium) slow down your central nervous system by enhancing GABA, whilst beta-blockers literally slow your heart rate by blocking adrenaline receptors.

The evidence is pretty solid - Soomro's review of 17 studies showed SSRIs significantly reduced OCD symptoms compared to placebos. However, these drugs only treat symptoms, not root causes, and come with side effects like nausea and insomnia.

Ethics Alert: Using placebos in drug trials raises serious questions about whether patients are getting the treatment they deserve.

Raine's Brain Scan Study on Murderers

What if violent criminals literally have different brains? Raine's groundbreaking study used PET scans to peek inside the minds of 41 murderers who pleaded not guilty by reason of insanity (NGRI).

Using FDG injections and brain imaging, Raine discovered that murderers had reduced activity in the prefrontal cortex (the area controlling impulses) and weird patterns in their amygdala, hippocampus, and thalamus. Essentially, the brain regions controlling emotion and decision-making weren't firing properly.

The quasi-experimental design meant no cause-and-effect could be proven - we can't say whether brain differences cause violence or violence causes brain changes. The PET scan technique was brilliant for showing live brain activity, but the sample was quite specific (convicted murderers), making it hard to generalise to other violent crimes.

Raine was careful to point out his findings don't mean biology determines criminality or that people aren't responsible for their actions. There were also confounding variables like brain injuries and IQ that couldn't be controlled.

Real Talk: This research raises huge ethical concerns about consent from mentally ill prisoners and potential discrimination against people with similar brain patterns.

Evaluating the Biological Approach

The biological approach has some serious strengths, but it's definitely not perfect - and understanding its limitations is crucial for your exams.

Scientific credibility is its biggest strength. Studies like Raine's use proper PET scans and replicable methods, whilst drug therapy research involves controlled trials with measurable results. This isn't just theory - it's hard science that other researchers can verify and build upon.

The approach's deterministic nature allows early intervention. If we know someone's genetically predisposed to schizophrenia, we can potentially prevent it with early treatment. Successful applications are everywhere - Vigurea found 60% success rates treating bipolar disorder with Lithium.

However, it's massively reductionist, boiling down complex human behaviour to simple chemical equations. Mental illness usually involves multiple factors, not just neurotransmitter imbalances. The approach also chooses nature over nurture, ignoring trauma and environmental factors that clearly influence mental health.

Individual differences get completely overlooked. Taylor's research showed men have 'fight or flight' responses whilst women show 'tend and befriend' - yet most biological studies generalise findings across genders without considering hormonal differences like oxytocin in women.

Exam Tip: Always discuss both strengths and weaknesses - the biological approach is scientifically solid but dangerously oversimplified.