“Researchers found 258 different genetic variants linked to extroversion … the trait was also linked to neurodevelopmental conditions such as A.D.H.D.

https://archive.ph/20260903212043/https://www.nytimes.com/2026/09/03/science/genes-personality-traits.html#selection-4273.0-4273.406

We probably have to come up with new names for personality traits that line up better with the genes that influence temperament. Also, sociobiology returns…

(Article and researchers speak of personality, but I think they are actually studying temperament – of which personality is an adult observable consequence.)