The Beauty Of Settled Science

In psychology research, there are findings that stand firm, providing a foundation for understanding the human mind. One such discovery is that the brain is shaped by reinforcement learning, with a key driver being a prediction-error-based algorithm in the nucleus accumbens, driven by dopamine. Psychedelic drugs interact with 5-HT2A receptors, indicating a role for these receptors in a balance between prior knowledge and new evidence.

Cognitive functions are localized to specific brain areas, such as impulse control in the frontal lobes, linguistic structure in Broca's area, and linguistic meaning in Wernicke's area. However, injury to these areas can cause their functions to shift, suggesting that neurons are versatile, and specialization is a convenience and efficiency rather than a necessity.

Personality traits and general capabilities are roughly 50% genetic and 50% random, with family environment and childhood history playing little roles. Schizophrenia and bipolar disorder have a strong genetic component, but prenatal infection, obstetric complications, social stress, and drug use may also influence risk. Modern psychology and psychiatry's ability to treat mental illness is real but limited, with SSRIs helping half or slightly fewer than half of patients, antipsychotics having extreme side effects, and benzodiazepines causing addiction and tolerance.

Psychotherapy works moderately well, but its effectiveness often depends more on the provider's relationship than the therapy's details. Mental hospitalization can provide short-term relief but may have negative long-term effects. Although schizophrenia and bipolar disorder have genetic links, prenatal infection, obstetric complications, social stress, and drug use can also contribute to risk.

The brain's reinforcement learning algorithms are evident in classical and operant conditioning, with different reinforcement schedules affecting reinforcement levels. This can be exploited to create compelling products, like slot machines. Despite some speculation and unorthodox theories, these findings are a step above a single questionable paper that may not replicate.

Science's beauty lies in its settled discoveries, such as General Relativity governing planetary orbits and phlogiston theory being false. These solid scientific concepts provide a reliable framework, unlike the thin and often wrong evidence behind newsworthy scientific controversies.