Neurobiological correlates and attenuated positive social intention attribution during laughter perception associated with degree of autistic traits

Abstract

Laughter plays an important role in group formation, signaling social belongingness by indicating a positive or negative social intention towards the receiver. In adults without autism, the intention of laughter can be correctly differentiated without further contextual information. In autism spectrum disorder (ASD), however, differences in the perception and interpretation of social cues represent a key characteristic of the disorder. Studies suggest that these differences are associated with hypoactivation and altered connectivity among key nodes of the social perception network. How laughter, as a multimodal nonverbal social cue, is perceived and processed neurobiologically in association with autistic traits has not been assessed previously. We investigated differences in social intention attribution, neurobiological activation, and connectivity during audiovisual laughter perception in association with the degree of autistic traits in adults [N = 31, Mage (SD) = 30.7 (10.0) years, nfemale = 14]. An attenuated tendency to attribute positive social intention to laughter was found with increasing autistic traits. Neurobiologically, autistic trait scores were associated with decreased activation in the right inferior frontal cortex during laughter perception and with attenuated connectivity between the bilateral fusiform face area with bilateral inferior and lateral frontal, superior temporal, mid-cingulate and inferior parietal cortices. Results support hypoactivity and hypoconnectivity during social cue processing with increasing ASD symptoms between socioemotional face processing nodes and higher-order multimodal processing regions related to emotion identification and attribution of social intention. Furthermore, results reflect the importance of specifically including signals of positive social intention in future studies in ASD.

Transcranial direct current stimulation combined with speech therapy in Fragile X syndrome patients: a pilot study

“…This suggests that as frontal activation increases, language abilities tend to decline or remain impaired. Conversely, when frontal activation decreases, there may be an improvement in language skills, as already shown in autism spectrum disorder ( 39 ). With this regard, tDCS has been previously shown to modulate functional connectivity between DLPFC and other regions of the brain ( 40 ), and this additional mechanism could suggest another possible neurophysiological explanation for our results.…”