Abstract
Previous findings have shown that individuals with autism spectrum disorder (ASD) evince greater intra-individual variability (IIV) in their sensory-evoked fMRI responses compared to typical control participants. We explore the robustness of this finding with a new sample of high-functioning adults with autism. Participants were presented with visual, somatosensory and auditory stimuli in the scanner whilst they completed a one-back task. While ASD and control participants were statistically indistinguishable with respect to behavioral responses, the new ASD group exhibited greater IIV relative to controls. We also show that the IIV was equivalent across hemispheres and remained stable over the duration of the experiment. This suggests that greater cortical IIV may be a replicable characteristic of sensory systems in autism.
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Acknowledgments
The research described here was supported by a Grant from the Simons Foundation Autism Research Initiative (177638) to DH and MB, and a NIH/NICHD Grant (HD055748) to NJM. The authors thank Ryan Egan for helping with participant recruitment and fMRI testing. We also thank the staff at the Center for Excellence in Autism Research at the University of Pittsburgh for recruitment and assessment of participants.
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The authors declare that they have no conflict of interest pertaining to the data described here.
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Haigh, S.M., Heeger, D.J., Dinstein, I. et al. Cortical Variability in the Sensory-Evoked Response in Autism. J Autism Dev Disord 45, 1176–1190 (2015). https://doi.org/10.1007/s10803-014-2276-6
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DOI: https://doi.org/10.1007/s10803-014-2276-6