Unbroken mirror neurons in autism spectrum disorders

• Published in: Journal of child psychology and psychiatry 2010-09, Vol.51 (9), p.981-988
• Main Authors: Fan, Yang-Teng, Decety, Jean, Yang, Chia-Yen, Liu, Ji-Lin, Cheng, Yawei
• Format: Article
• Language: English
• Subjects: Adolescent; Adult; Analysis of Variance; Attention; Autism; Autism Spectrum Disorders; Autistic spectrum disorders; Biological and medical sciences; Brain; Child; Child clinical studies; Child Development Disorders, Pervasive - diagnosis; Child Development Disorders, Pervasive - physiopathology; Child psychology; Communication Problems; Control Groups; Correlation; Developmental disorders; Diagnostic Tests; Dominance, Cerebral; Dysfunction; Electroencephalography - methods; Eye Movements; Fixation; Fixation, Ocular; Fourier Analysis; Group Membership; Heterogeneity; Humans; Infantile autism; Interpersonal Competence; Male; Medical sciences; Mirror neurons; Motor ability; mu suppression; Neurons; Neurons - physiology; Neurosciences; Observation; Pervasive Developmental Disorders; Photic Stimulation - methods; Psychology. Psychoanalysis. Psychiatry; Psychomotor Skills; Psychopathology. Psychiatry; Research Needs; Severity (of Disability); Stimuli; Suppression; Symptoms (Individual Disorders); Theory; Visual Stimuli; Young Adult
• ISSN: 0021-9630; 1469-7610
• DOI: 10.1111/j.1469-7610.2010.02269.x

Background:  The ‘broken mirror’ theory of autism, which proposes that a dysfunction of the human mirror neuron system (MNS) is responsible for the core social and cognitive deficits in individuals with autism spectrum disorders (ASD), has received considerable attention despite weak empirical evidence. Methods:  In this electroencephalographic study, we examined mu suppression, as an indicator of sensorimotor resonance, concurrent with oculomotor performance while individuals (n = 20) with ASD and control participants (n = 20) either executed hand actions or observed hand actions or a moving dot. No difference in visual attention between groups was found as indicated by fixation duration and normalized fixation number on the presented stimuli. Results:  The mu suppression over the sensorimotor cortex was significantly affected by experimental conditions, but not by group membership, nor by the interaction between groups and conditions. Individuals with ASD, similar to the controls, exhibited stronger mu suppression when watching hand actions relative to a moving dot. Notably, participants with ASD failed to imitate the observed actions while their mu suppression indicating the MNS activity was intact. In addition, the mu suppression during the observation of hand actions was positively associated with the communication competence of individuals with ASD. Conclusion:  Our study clearly challenges the broken mirror theory of autism. The functioning of the mirror neuron system might be preserved in individuals with ASD to a certain degree. Less mu suppression to action observation coupled with more communicational severity can reflect the symptom heterogeneity of ASD. Additional research needs to be done, and more caution should be used when reaching out to the media.