Guo J, Ma Y, Liu Z, et al. - In this investigation involving 34 patients with obstructive sleep apnea-hypopnea syndrome (OSAS) and 26 healthy control individuals, researchers studied emotional face recognition by patients with OSAS with impaired neurocognition. Study participants who had one night of polysomnographic evaluation before recruitment were asked to complete an emotion recognition task. Using repeated-measures analysis of variance, accuracy rates and reaction times have been analyzed and recorded. The phenomenon of PCA vanished when candidates were asked to distinguish positive (happy) and negative (sad) emotional expressions. Importantly, however, patients with OSAS recognized sad faces better than control patients who displayed PCA but were comparable in happy face processing. Based on previous studies that showed depressed emotion in OSAS patients, the results indicate that OSAS patients display negative bias in the recognition of facial expression, which could lead to a decrease in social communication ability.