Psychosis-specific neurocognitive impairments over the course of adolescence. Neuropsychological tests showing significant group differences were examined for a Group-by-Age interaction, suggestive of a divergent course of development among AOP patients. a The interaction was significant for WAIS-III Digit Symbol-Coding (DSC), P= 0.043, with controls displaying a strong correlation between age and processing speed (r=0.756, P<0.001) and patients showing a less reliable association (r = 0.287, P>0.10). b The Group-by-Age interaction reached a trend level of significance for delayed verbal memory recall (P=0.064) and motor coordination (P=0.071)