Topic 3: Psychological problems Study Guide

Drug treatments for psychological problems like depression and addiction involve chemotherapy, using medication to alter brain chemistry. For depression, Selective Serotonin Reuptake Inhibitors (SSRIs) are commonly prescribed. SSRIs increase the availability of serotonin in the brain, a neurotransmitter associated with mood regulation, by blocking its reabsorption. This can help alleviate symptoms such as low mood and lack of interest.

For addiction, different types of drugs are used depending on the substance of abuse. Opioid addiction, for example, can be treated with agonist drugs like methadone or buprenorphine, which bind to the same receptors as opioids but produce a milder, longer-lasting effect, thus reducing cravings and withdrawal symptoms. Antagonist drugs, such as naltrexone, block the effects of opioids and are used to prevent relapse. Aversive drugs, like disulfiram for alcohol addiction, produce unpleasant physical reactions when combined with the substance, acting as a deterrent. While effective for symptom management and relapse prevention, drug treatments often have side effects and may require long-term use, highlighting the importance of considering psychological evidence, research methods, and ethical implications when evaluating their use.

Genetic explanations suggest that certain psychological conditions like depression and addiction may have a hereditary component, meaning they can be passed down through generations. This perspective posits that individuals may inherit specific genes or combinations of genes that predispose them to developing these conditions. However, genes alone are rarely considered deterministic; instead, they are thought to create a vulnerability that interacts with environmental factors. For example, a person might inherit a genetic predisposition for depression but only develop the condition if exposed to significant stress or trauma. Similarly, with addiction, genetic factors might influence how an individual's brain responds to substances, increasing their susceptibility, but environmental influences such as peer pressure or availability of substances also play a crucial role. Research in behavioural genetics often compares concordance rates in identical and non-identical twins or studies adopted individuals to disentangle genetic and environmental influences. While genetic research has identified candidate genes linked to these conditions, the exact mechanisms are complex and involve multiple genes, each contributing a small effect. Additionally, epigenetic factors, which involve changes in gene expression without altering the DNA sequence, are also being explored for their role in mediating the interplay between genes and environment.