Biological Psychology — AI Study Guide

Mastering Biological Psychology

Biological psychology (also called biopsychology or neuroscience) examines the biological bases of behavior, thought, and emotion — how the nervous system, hormones, genetics, and evolution produce psychological phenomena. The field uses multiple research methods: brain imaging (fMRI, PET, EEG), lesion studies, animal models, pharmacological manipulations, and genetic methods to establish brain-behavior relationships.

The brain is the primary organ of psychology. Key structures and their functions: frontal lobe (executive function, motor control, personality), parietal lobe (somatosensory processing, spatial cognition), temporal lobe (auditory processing, language, memory), occipital lobe (visual processing), hippocampus (memory formation), amygdala (emotional processing, especially fear), cerebellum (motor coordination, procedural learning), and brainstem (vital autonomic functions). Hemispheric lateralization — left hemisphere language dominance in most people — reflects functional specialization.

Neurotransmitter systems underlie all psychological phenomena. Dopamine pathways mediate reward, motivation, and motor control — disruption underlies addiction, schizophrenia, and Parkinson's disease. Serotonin regulates mood, appetite, and sleep — SSRIs increase synaptic serotonin to treat depression and anxiety. Norepinephrine mediates arousal and stress responses. GABA is the primary inhibitory neurotransmitter — benzodiazepines enhance GABA activity. Glutamate is the primary excitatory neurotransmitter — excessive activation causes excitotoxicity in stroke.

Behavioral genetics examines the genetic and environmental contributions to psychological traits and disorders. Twin studies compare monozygotic (identical, 100% shared genes) and dizygotic (fraternal, 50% shared genes) twins to estimate heritability. Adoption studies separate genetic from environmental effects. GWAS (genome-wide association studies) identify specific genetic variants associated with psychological traits. Most psychological traits and disorders show moderate to high heritability (40-80%) with significant environmental influence.

Frequently Asked Questions: Biological Psychology

What is the function of the hippocampus?

The hippocampus (located in the medial temporal lobe) is critical for forming new explicit (episodic and semantic) memories. Patient HM, whose hippocampi were surgically removed to treat epilepsy, lost the ability to form any new explicit memories while retaining prior memories and implicit learning ability. The hippocampus converts short-term memories into long-term memories (memory consolidation) and is involved in spatial navigation. It is severely affected early in Alzheimer's disease.

What do twin studies tell us about genetics and behavior?

Twin studies compare monozygotic (MZ, identical) twins sharing ~100% of genes with dizygotic (DZ, fraternal) twins sharing ~50% of genes. If MZ twins are more similar than DZ twins on a trait, genetic factors contribute. Heritability (h²) estimates the proportion of variation due to genetic differences. Most psychological traits (intelligence, personality, mental disorders) show heritability of 40-80%, indicating both genetic and environmental contributions. High heritability does not mean unchangeable — it means genetic variation currently explains much of existing trait variation.

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