The Biological Approach - Core Assumptions

Ever wondered why you're attracted to certain people or why some behaviours seem hardwired? The biological approach has three key assumptions that explain human behaviour through our biology.

Evolutionary influences suggest that natural selection shapes our behaviour today. According to Trivers' theory, men and women have different strategies in relationships because of varying investment in offspring. Women invest more (pregnancy, childcare) so they seek partners with resources and ambition, while men invest less and look for signs of fertility and youth.

Your brain isn't just one big blob - it's organised into specific areas with different jobs. The cerebral cortex has four lobes: frontal $problem-solving$, parietal (sensory processes), occipital (vision), and temporal (hearing). Language lives mainly in the left hemisphere, with Broca's area handling speech production and Wernicke's area managing language understanding.

💡 Quick Tip: Remember the brain areas by thinking about their locations - Broca's is in the frontal lobe where you "produce" speech from the front of your mouth!

Neurotransmitters and Relationships

Neurotransmitters are your brain's chemical messengers, converting electrical signals to chemical ones to cross synapses. Think of them as the brain's postal service, delivering important messages between neurons.

Dopamine controls movement and emotions - when it's low, depression can follow. Serotonin affects your mood, sleep, and digestion. In romantic relationships, Aron's research shows dopamine activates reward centres, making you feel that natural "high" when you're attracted to someone.

The biological approach explains relationships through both evolution and chemistry. Women's greater investment in offspring makes them choosy about partners with resources, whilst men seek signs of fertility. Meanwhile, dopamine drives pleasure-seeking behaviour and goal-setting (like finding a partner), whilst oxytocin - the "bonding hormone" - increases trust and attachment through physical contact.

💡 Remember: Dopamine = reward and motivation, Oxytocin = bonding and attachment. Both work together to form and maintain relationships!

Drug Therapy Treatment

When mental disorders stem from faulty brain chemistry, drug therapy offers a biological solution. If behaviour is caused by biology, then it makes sense to treat it biologically using medication.

Antipsychotic drugs treat schizophrenia by targeting dopamine. Typical antipsychotics like Chlorpromazine block dopamine receptors to reduce hallucinations. Newer atypical antipsychotics like Clozapine work on both dopamine and serotonin, treating both positive symptoms (hallucinations) and negative symptoms (flat emotions).

Antidepressants boost neurotransmitter levels to improve mood. SSRIs (Selective Serotonin Reuptake Inhibitors) like Prozac prevent serotonin reabsorption, keeping more of this mood-boosting chemical available in your brain.

The process involves diagnosis, prescription, regular check-ups, and dose adjustments if needed. Soomro's research found SSRIs more effective than placebos for OCD, though drugs work better short-term and don't address underlying psychological causes.

💡 Key Point: Drug therapy treats symptoms quickly but may not solve root causes - that's why combining it with therapy like CBT often works best.

Raine's Brain Scan Study

Raine's groundbreaking study used PET scans to compare brain activity in 41 murderers found Not Guilty by Reason of Insanity (NGRI) with 41 matched non-murderers. All participants completed the same Continuous Performance Task whilst being scanned.

The results were striking: murderers showed less activity in the prefrontal cortex $self-control and decision-making$ and parietal lobes, but more activity in the amygdala and thalamus (emotion and fear processing). Importantly, both groups performed equally well on the actual task.

Raine concluded that whilst brain differences exist in violent individuals, this doesn't prove violence is purely biological. Social, psychological, and environmental factors matter too. Brain scans help us understand violent behaviour but can't diagnose or predict it alone.

This research used scientific, objective PET scanning technology with strict controls - same task, scanner, and medication-free participants. However, the study only included NGRI murderers, limiting how we can apply findings to other violent criminals.

💡 Critical Thinking: Brain differences don't equal causation - correlation isn't the same as cause and effect!

Ethical and Social Implications

Raine's research raises serious ethical concerns about consent and psychological harm. Participants with mental health conditions might not fully understand what they're agreeing to, and PET scans could increase anxiety, especially for those with paranoia or schizophrenia.

The social implications are equally complex. Brain scans as biological evidence in court could affect how we view criminal responsibility - are people with "different" brains less accountable for their actions? This might influence sentencing and challenge our understanding of free will.

There's also risk of creating a "born criminal" stereotype, leading to discrimination in employment or social situations based on brain scans. However, used responsibly, this research could enable early intervention and better support systems before violence occurs.

The key is using such findings wisely - for treatment and understanding rather than labelling or discrimination. Brain differences are just one piece of the puzzle, alongside environmental, social, and psychological factors.

💡 Think About It: Scientific discoveries are powerful tools - but how we use them in society determines whether they help or harm people.

Evaluating the Biological Approach

The biological approach stands out as genuinely scientific because it studies measurable variables like neurotransmitters, brain structures, and localisation of functions. This allows for objective, controlled research with clear cause-and-effect relationships.

Research examples include drug therapy studies linking dopamine to behaviour, psychosurgery based on brain-behaviour connections, and Raine's PET scan comparisons. These demonstrate scientific rigour through objective measurement and controlled conditions.

Positive applications are impressive - Chereck found that men with conduct disorder became less aggressive after 21 days of SSRIs compared to placebo groups. For bipolar disorder, Viguera showed over 60% improvement with lithium treatment. This approach has revolutionised mental health treatment, helping people live normal lives outside hospitals.

However, it's heavily deterministic, viewing behaviour as controlled by internal biological factors. Whilst this helps predict and treat conditions (high dopamine links to schizophrenia), it can ignore personal experiences and feelings.

💡 Balance is Key: The biological approach is scientifically strong and practically useful, but works best when combined with understanding of psychological and social factors.

Limitations and Nature vs Nurture

The biological approach faces criticism for being reductionist - explaining complex behaviours through simple biological causes like hormones or brain chemicals. Reducing schizophrenia to just dopamine levels ignores the person's lived experiences and emotions, limiting our understanding.

It heavily emphasises nature over nurture, focusing on biology whilst ignoring life experiences and environmental factors. For mental illness, this means looking at chemical imbalances but not considering trauma, relationships, or social circumstances that might contribute.

Evidence supports biological explanations: amphetamines increase dopamine and can trigger schizophrenia-like symptoms, whilst antipsychotic drugs reduce dopamine and improve symptoms. Brain scans show overactive areas in OCD, and cingulotomy surgery targeting these areas can reduce symptoms.

But this deterministic view - that biology determines behaviour - raises questions about free will and personal responsibility. If stress causes illness, early intervention makes sense, but we shouldn't ignore psychological and social factors that make each person's experience unique.

💡 Remember: Biology is important, but humans are complex - our behaviour results from biology, psychology, and environment working together.