Yonsei Med J.  2015 May;56(3):705-711. 10.3349/ymj.2015.56.3.705.

Abnormal Brain Activity in Social Reward Learning in Children with Autism Spectrum Disorder: An fMRI Study

• Choi US
• Kim SY
• Sim HJ
• Lee SY
• Park SY
• Jeong JS
• Seol KI
• Yoon HW
• Jhung K
• Park JI
• Cheon KA

• KMID: 2450344
• DOI: http://doi.org/10.3349/ymj.2015.56.3.705

Abstract

PURPOSE
We aimed to determine whether Autism Spectrum Disorder (ASD) would show neural abnormality of the social reward system using functional MRI (fMRI).
MATERIALS AND METHODS
27 ASDs and 12 typically developing controls (TDCs) participated in this study. The social reward task was developed, and all participants performed the task during fMRI scanning.
RESULTS
ASDs and TDCs with a social reward learning effect were selected on the basis of behavior data. We found significant differences in brain activation between the ASDs and TDCs showing a social reward learning effect. Compared with the TDCs, the ASDs showed reduced activity in the right dorsolateral prefrontal cortex, right orbitofrontal cortex, right parietal lobe, and occipital lobe; however, they showed increased activity in the right parahippocampal gyrus and superior temporal gyrus.
CONCLUSION
These findings suggest that there might be neural abnormality of the social reward learning system of ASDs. Although this study has several potential limitations, it presents novel findings in the different neural mechanisms of social reward learning in children with ASD and a possible useful biomarker of high-functioning ASDs.

Keyword

ASDs; social reward leaning; fMRI

MeSH Terms

Brain/*physiopathology
Brain Mapping
Case-Control Studies
Child
Child Development Disorders, Pervasive/*physiopathology
Female
Functional Neuroimaging/*methods
Humans
Magnetic Resonance Imaging/methods
Male
Neural Pathways/*physiopathology
Psychiatric Status Rating Scales
Republic of Korea
*Reward
*Social Behavior

Figure

• 

  Fig. 1 Behavioral results of the subjects. (A) Comparison between the ASDs and TDCs who showed a social reward learning effect. There was no significant difference between the two groups. (B) Comparison between different ASDs subgroups. LE, subgroup with a social reward learning effect; nLE, subgroup without a social reward learning effect; ASD, Autism Spectrum Disorder; TDC, typically developing control.

• 

  Fig. 2 Different brain activation maps of ASDs and TDCs with a social reward learning effect. (A) Different brain activation maps of the ASDs> the TDCs contrast. The parahippocampal gyrus and superior temporal cortex were observed (ANOVA analysis with random effect GLM, p<0.01, uncorrected). (B) Different brain activation maps of the TDCs> the ASDs contrast. The dorsolateral prefrontal cortex, orbitofrontal cortex and parietal lobe were observed (ANOVA analysis with random effect GLM, p<0.01, uncorrected). ANOVA, analysis of variance; GLM, general linear model; ASD, Autism Spectrum Disorder; TDC, typically developing control; PG, parahippocampal gyrus; STG, superior temporal gyrus; DLPFC, dorsolateral prefrontal cortex; OFC, orbitofrontal cortex.

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