“Masking” is part of life, especially for those with autism or A.D.H.D. But hiding your true self comes with a cost.

Often called the world’s most famous face reader, he inspired the TV show ‘Lie to Me.’ But some questioned his assumption that human expressions were ‘pan-cultural.’

Young adults who engaged in a social media “detox” reported reductions in depression, anxiety and insomnia, though it was unclear how long the effects would last.

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She maintained a triangular correspondence with the two men, who overshadowed the significant contributions she made to the field of psychoanalysis.

Psychologists and technologists see them as the future of therapy. The Food and Drug Administration is exploring whether to regulate them as medical devices.

© Kendrick Brinson for The New York Times

Economists and psychologists say that compensation may not provide as powerful an incentive as is often assumed.

© Maansi Srivastava for The New York Times