A famous account of multiple personality disorder in the early 20th century foreshadowed a century of controversial diagnoses and debate among psychiatrists.

A study in people fails to detect differences in the brain’s response to fear or anxiety, long thought to be controlled by different neural circuits.

People who show low social engagement over long periods of time often show reductions in cognitive function. Studies of the brain may provide clues about this correlation.

Absence of human contact is associated with declines in cognitive function. But as the COVID-19 pandemic brings concerns about the potential harms of isolation to the fore, researchers are still hunting for concrete evidence of a causal role as well as possible mechanisms.

Those who had developed PTSD appear to be less able to suppress unwanted memories—traumatic or not—suggesting a role for the general ability to control memory recall in the disorder.

Studies point to a role for physical activity in fighting malignancies, improving treatment outcomes, and fostering overall health in patients.

Clues about the biological mechanisms that contribute to a person’s chance of contemplating or attempting suicide

The biochemical mechanisms in the brain underlying suicidal behavior are beginning to come to light, and researchers hope they could one day lead to better treatment and prevention strategies.

A meta-analysis of more than 80 studies from the past four decades finds weak evidence to support the use of medicinal cannabis to treat anxiety, depression, and other mental health disorders.