Decline in verbal ability predictor for psychosis

The researchers also found that decline in verbal ability between 13 and 18 years was a much stronger predictor of future psychosis than verbal ability at 18 years alone. 

The declines were relative to the general population, and more likely to represent an impairment in acquiring verbal skills, rather than an actual deterioration.

“It is probable that the individuals who will later develop psychosis do not progress as quickly as their peers,” the authors said. 

JAMA Psychiatry; online 16 Jan