Brain Structures and Biological Psychology

Ever wondered why damage to different parts of your brain causes completely different problems? Each brain lobe has its own specialised job that keeps you functioning normally.

Your temporal lobe processes everything you hear and helps with language understanding. The frontal lobe controls voluntary movement and keeps your emotions in check - think of it as your brain's CEO. Meanwhile, your parietal lobe makes sense of touch and other sensory information, whilst the occipital lobe handles all visual processing.

The famous case of Phineas Gage proves how specific brain areas control behaviour. After frontal lobe damage from an accident, this railway worker went from being pleasant and reliable to violent and rude. This shows how localisation of function works - specific brain areas control specific behaviours.

Psychopaths demonstrate what happens when brain structure goes wrong. They have damage to the orbital cortex and abnormal amygdala function, leading to poor impulse control and lack of empathy. Your frontal lobes are crucial for impulse control, emotional regulation, and proper social behaviour.

Key Point: Brain damage in specific areas leads to predictable behavioural changes, proving that different brain regions have specialised functions.

Genetics play a massive role in who you become. You inherit 50% of your genes from each biological parent, creating your genotype (your genetic blueprint). However, your phenotype (actual characteristics) results from genes interacting with your environment. The MAOA "warrior gene" increases the probability of violent behaviour, but doesn't guarantee it.

Twin studies reveal that psychological disorders aren't purely genetic. Only 48% of monozygotic twins (identical) both develop schizophrenia, showing environment matters too. However, the more genes you share with someone, the higher your risk of developing the same conditions.

Evolution explains why certain traits survive through natural selection. Genotypes that increase reproductive success get passed on, whilst maladaptive genes may lead to extinction if environments change.

Neurochemistry shows how chemical imbalances affect mental health. Schizophrenia involves dopamine overactivity, causing hallucinations and delusions. Depression stems from serotonin underactivity, leading to low mood and lack of motivation.