Facial expression recognition ability and its neuropsychological mechanisms in children with attention deficit and hyperactive disorder.

Abstract

Attention deficit and hyperactive disorder (ADHD) is a chronic neurodevelopmental disorder characterized by inattention, hyperactivity-impulsivity, and working memory deficits. Social dysfunction is one of the major challenges faced by children with ADHD. It's found that children with ADHD perform less well than typically developing children on facial expression recognition (FER) tasks. Generally, children with ADHD have some difficulties in FER, while some researches suggest that they have no significant differences in accuracy of specific emotion recognition with typically developing children. The neuropsychological mechanisms underlying these difficulties are as follows: 1. neuroanatomically, compared to typically developing children, children with ADHD show smaller gray matter volume and surface area in the amygdala and medial prefrontal cortex regions, as well as reduced density and volume of axons/cells in certain frontal white matter fiber tracts; 2. neurophysiologically, children with ADHD exhibit increased slow-wave activity in their electroencephalogram, and event-related potential studies reveal abnormalities in emotional regulation and responses to angry faces when facing facial stimuli; 3. psychologically, psychosocial stressors may influence FER abilities in children with ADHD, and sleep deprivation in ADHD children may significantly increase their recognition threshold for negative expressions such as sadness and anger. This article reviews research progress on the FER abilities of children with ADHD over the past three years, analyzing the FER deficit in children with ADHD from three dimensions: neuroanatomy, neurophysiology and psychology, aiming to provide new perspectives for further research and clinical treatment of ADHD.