To elucidate the differences in the sensory profiles of children across the autism spectrum and across the SPD subcategories, further research is required. 

Differentiating between ASD and SPD (further research required)

More current research, published in 2020, indicates that, in general, children with SPD may have more sensory processing issues than children with ASD. 

Lawrence University

While it is not clear what the neural substrates underlying sensory processing deficits in children with ASD and SPD are yet, research in 2017 shows that there are larger gray matter volumes in early sensory regions associated with atypical sensory processing of visual, auditory, tactile, and taste/smell modalities. 

Differentiating between SPD and ASD (2017 research)

Tavassoli, T., Miller, L. J., Schoen, S. A., Jo Brout, J., Sullivan, J., &#38; Baron-Cohen, S. (2018). Sensory reactivity, empathizing and systemizing in autism spectrum conditions and sensory processing disorder. Developmental Cognitive Neuroscience, 29, 72–77. https://doi.org/10.1016/j.dcn.2017.05.005

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