Chapter 9: Cognition, Behavior, & Mental Status

Cognition, Behavior, & Mental Status outlines the foundational anatomy of the central nervous system, identifying the roles of the cerebrum, diencephalon, and brainstem in regulating mental function, while explaining how imbalances in neurotransmitters like serotonin, dopamine, and acetylcholine correlate with conditions such as depression, psychosis, and dementia. The text emphasizes the high prevalence of mental disorders in primary care and provides practitioners with a structured approach to identifying symptoms that are often masked by physical complaints. Detailed sections guide the clinician through assessing common concerns, including excessive worry and anxiety disorders, persistent depressed moods, and memory impairments associated with major neurocognitive disorders. The chapter meticulously details the mental status examination, which involves observing appearance, behavior, and level of consciousness—ranging from alertness to coma—as well as analyzing speech patterns for signs of aphasia or dysarthria. It explores the evaluation of a patient's inner emotional state through mood and affect, while distinguishing between thought processes, such as flight of ideas, and thought content, including delusions and obsessions. Furthermore, it addresses abnormalities in perception, such as hallucinations and illusions, and assesses the critical domains of insight and judgment. Cognitive functions are rigorously tested through measures of orientation, attention spans like serial 7s, and memory retention. To support diagnostic accuracy, the chapter incorporates evidence-based screening tools like the PHQ-9 for depression, the Confusion Assessment Method for delirium, and the Mini-Cog or MoCA for cognitive decline. By integrating neurocircuitry insights with practical examination techniques, this resource prepares students and healthcare professionals to perform thorough psychiatric evaluations, address the stigma of mental illness, and effectively manage complex patient presentations.