Gray J M, Fraser W L, Leudar I
Br J Psychiatry. 1983 Jun;142:566-71. doi: 10.1192/bjp.142.6.566.
When mildly and severely mentally retarded people saw photographs showing expressions of basic emotions their overall performance was found to be correlated with intelligence. Certain specific patterns of confusion were determined, clinically the most significant being an inability to cope with high intensity emotions.
