Changes in Multidigit Synergies and Their Feed-Forward Adjustments in Multiple Sclerosis

Hang Jin Jo, Daniela Mattos, Elisabeth Lucassen, Xuemei Huang, Mark Latash

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The authors explored the changes in multidigit synergies in patients with multiple sclerosis (MS) within the framework of the uncontrolled manifold hypothesis. The specific hypotheses were that both synergy indices and anticipatory synergy adjustments prior to the initiation of a self-paced quick action would be diminished in the patients compared to age-matched controls. The MS patients and age-matched controls (n = 13 in both groups) performed one-finger and multifinger force production tasks involving both accurate steady-state force production and quick force pulses. The patients showed significantly lower maximal finger forces and a tendency toward slower force pulses. Enslaving was increased in MS, but only in the lateral fingers (index and little). Indices of multifinger synergies during steady-state force production were lower in MS, mainly due to the lower amount of intertrial variance that did not affect total force. Anticipatory synergy adjustments were significantly delayed in MS. The results show that MS leads to significant changes in multidigit synergies and feed-forward adjustments of the synergies prior to a quick action. The authors discuss possible contributions of subcortical structures to the impaired synergic control.

Original languageEnglish (US)
Pages (from-to)218-228
Number of pages11
JournalJournal of motor behavior
Volume49
Issue number2
DOIs
StatePublished - Mar 4 2017

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Multiple Sclerosis
Fingers
Advisory Committees

All Science Journal Classification (ASJC) codes

  • Biophysics
  • Orthopedics and Sports Medicine
  • Experimental and Cognitive Psychology
  • Cognitive Neuroscience

Cite this

Jo, Hang Jin ; Mattos, Daniela ; Lucassen, Elisabeth ; Huang, Xuemei ; Latash, Mark. / Changes in Multidigit Synergies and Their Feed-Forward Adjustments in Multiple Sclerosis. In: Journal of motor behavior. 2017 ; Vol. 49, No. 2. pp. 218-228.
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Changes in Multidigit Synergies and Their Feed-Forward Adjustments in Multiple Sclerosis. / Jo, Hang Jin; Mattos, Daniela; Lucassen, Elisabeth; Huang, Xuemei; Latash, Mark.

In: Journal of motor behavior, Vol. 49, No. 2, 04.03.2017, p. 218-228.

Research output: Contribution to journalArticle

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