Altered responsiveness to basic sensory input is an under-studied symptom in autism spectrum disorders (ASD) that likely has far-reaching effects on development, although these effects are not well understood. While the term sensory typically connotes stimuli external to the body, there is copious sensory information within the body as well, including visceral and proprioceptive signals. Hypo-responsiveness to external sensory stimuli shows very strong association with core clinical symptoms, and differentiates ASD from other developmental disorders better than hyper-responsiveness. The experiments described in this project are designed to investigate possible mechanisms for this under-responsiveness, and attempts to reconcile these with growing evidence that individuals with ASD show enhanced reliance on internal sensory signals when they are in competition with external cues. We predict that basic sensory perception of internal (interoceptive) and external sensory cues will not differ in ASD, but expect differences in higher order neural networks that integrate these signals and compare competing signals for salience in order to allocate attention. The project will emphasize the salience network, comprising anterior insular and anterior cingulate cortices, which integrate both internal and external cues with limbic input to determine their relative affective significance. We hypothesize that this system is involved in excessive focus on internal sensory cues, at the expense of external input, in ASD. We further predict that the neural and behavioral correlates of enhanced attention to internal sensory input relative to external will positively relate to social deficits and sensory hypo-responsiveness in ASD. If these predictions are supported, neural differences in the salience network could serve as novel biomarkers for ASD and behavioral differences could be parlayed into improved therapeutic approaches, including mindfulness-based therapies that could capitalize on an existing strength in attending to internal sensory cues.

Public Health Relevance

This project addresses basic sensory perception, salience attribution, and attention to external and internal sensory input in ASD, with a focus on neural networks that integrate and compare these sources of input to determine allocation of attention. We predict that attention and salience networks, but not basic sensory perception, will differ in ASD in favor of more salience attribution and attentional weighting to internal signals. We also expect these differences to be predictive of sensory hypo-responsiveness and social impairment, giving these experiments the potential to elucidate a neural mechanism for ASD symptoms that is tightly linked to basic affective processing of sensory signals, which may uncover novel biomarkers for ASD.

Agency
National Institute of Health (NIH)
Institute
National Institute of Mental Health (NIMH)
Type
Research Project (R01)
Project #
5R01MH102272-05
Application #
9476362
Study Section
Child Psychopathology and Developmental Disabilities Study Section (CPDD)
Program Officer
Gilotty, Lisa
Project Start
2014-08-07
Project End
2019-04-30
Budget Start
2018-05-01
Budget End
2019-04-30
Support Year
5
Fiscal Year
2018
Total Cost
Indirect Cost
Name
Vanderbilt University Medical Center
Department
Type
DUNS #
079917897
City
Nashville
State
TN
Country
United States
Zip Code
37232
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Cascio, Carissa J; Gu, Chang; Schauder, Kimberly B et al. (2015) Somatosensory Event-Related Potentials and Association with Tactile Behavioral Responsiveness Patterns in Children with ASD. Brain Topogr 28:895-903

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