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Article
Two-Legged Hopping in Autism Spectrum Disorders
PTHMS Faculty Publications
  • Matthew F Moran, Sacred Heart University
  • John T. Foley, SUNY Cortland
  • Mary E. Parker, Texas State University - San Marcos
  • Michael J. Weiss, Fairfield University
Document Type
Article
Publication Date
3-26-2013
Abstract
Sensory processing deficits are common within autism spectrum disorders (ASD). Deficits have a heterogeneous dispersion across the spectrum and multimodal processing tasks are thought to magnify integration difficulties. Two-legged hopping in place in sync with an auditory cue (2.3, 3.0 Hz) was studied in a group of six individuals with expressive language impaired ASD (ELI-ASD) and an age-matched control group. Vertical ground reaction force data were collected and discrete Fourier transforms were utilized to determine dominant hopping cadence. Effective leg stiffness was computed through a mass-spring model representation. The ELI-ASD group were unsuccessful in matching their hopping cadence (2.21 ± 0.30 hops·s−1, 2.35 ± 0.41 hops·s−1) to either auditory cue with greater deviations at the 3.0 Hz cue. In contrast, the control group was able to match hopping cadence (2.35 ± 0.06 hops·s−1, 3.02 ± 0.10 hops·s−1) to either cue via an adjustment of effective leg stiffness. The ELI-ASD group demonstrated a varied response with an interquartile range (IQR) in excess of 0.5 hops·s−1 as compared to the control group with an IQR < 0.03 hops·s−1. Several sensorimotor mechanisms could explain the inability of participants with ELI-ASD to modulate motor output to match an external auditory cue. These results suggest that a multimodal gross motor task can (1) discriminate performance among a group of individuals with severe autism, and (2) could be a useful quantitative tool for evaluating motor performance in individuals with ASD individuals.
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This work was supported by a Sacred Heart University Research & Creativity Grant.

This document is protected by copyright and was first published by Frontiers. All rights reserved. It is reproduced with permission.

DOI
10.3389/fnint.2013.00014
Citation Information
Moran, Matthew F., John T. Foley, Mary E. Parker, and Michael J. Weiss. "Two-legged hopping in autism spectrum disorders." Frontiers in Integrative Neuroscience 7.14 (2013): 1-8.