![]() ![]() One line of investigation centers on temporal processing deficits, i.e., deficits caused by abnormal processing of stimuli in time. Within the sensory modalities, in turn, studies of abnormal somatosensory processing are under-represented relative to studies of abnormal visual or auditory processing in ASD (Marco et al., 2011).Ībnormalities in sensory processing might arise from many different sources. Despite the high prevalence of such abnormalities in ASD, studies investigating the neural correlates of these abnormalities are under-represented relative to studies of the neural correlates of social abnormalities in ASD for instance. While not core to ASD by definition, it is well known that ASD individuals experience many sensory abnormalities, with both sensory hypo- and hyper-sensitivities documented in most individuals with ASD (Leekam et al., 2007 Tomchek and Dunn, 2007 Cascio et al., 2008). These results suggest that rapid temporal processing deficits in ASD are not generalized across multiple sensory domains, and are unlikely to underlie the behavioral somatosensory abnormalities observed in ASD.Īutism spectrum disorder (ASD) is diagnosed behaviorally, with core abnormalities in the social interactions, communication, and repetitive behavior domains. Contrary to findings in the auditory domain, we also found no group differences in the evoked responses to the sequence with a short (200 ms) temporal separation. As expected, we found no group difference in the evoked response to pulses with long (700 ms) temporal separation. We analyzed the responses in cortical space, in primary somatosensory cortex. Specifically, we tested the somatosensory cortex response to a sequence of two tactile pulses with different (short and long) temporal separation. Here, we tested the somatosensory domain in ASD for abnormalities in rapid processing of tactile pulses, to determine whether abnormalities there parallel those observed in the auditory domain. In parallel, there is substantial evidence of somatosensory processing abnormalities in ASD, including in the temporal domain. ![]() In particular, it has been shown that individuals with ASD have abnormal cortical auditory evoked responses to rapid, but not slow, sequences of tones. ![]() In the auditory domain, studies have shown that cortical responses in the early auditory cortex in ASD are abnormal in multiple ways. Yet, the neurophysiological correlates of these abnormalities have not been fully mapped. While abnormal sensory processing is not considered core to the disorder, most ASD individuals report sensory processing abnormalities. Autism spectrum disorder (ASD) is a developmental disorder diagnosed behaviorally, with many documented neurophysiological abnormalities in cortical response properties. ![]()
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