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Experimental Brain Research

, Volume 233, Issue 5, pp 1625–1637 | Cite as

Neural processes mediating the preparation and release of focal motor output are suppressed or absent during imagined movement

  • Jeremy S. Eagles
  • Anthony N. Carlsen
  • Colum D. MacKinnon
Research Article
  • 216 Downloads

Abstract

Movements that are executed or imagined activate a similar subset of cortical regions, but the extent to which this activity represents functionally equivalent neural processes is unclear. During preparation for an executed movement, presentation of a startling acoustic stimulus (SAS) evokes a premature release of the planned movement with the spatial and temporal features of the tasks essentially intact. If imagined movement incorporates the same preparatory processes as executed movement, then a SAS should release the planned movement during preparation. This hypothesis was tested using an instructed-delay cueing paradigm during which subjects were required to rapidly release a handheld weight while maintaining the posture of the arm or to perform first-person imagery of the same task while holding the weight. In a subset of trials, a SAS was presented at 1500, 500, or 200 ms prior to the release cue. Task-appropriate preparation during executed and imagined movements was confirmed by electroencephalographic recording of a contingent negative variation waveform. During preparation for executed movement, a SAS often resulted in premature release of the weight with the probability of release progressively increasing from 24 % at −1500 ms to 80 % at −200 ms. In contrast, the SAS rarely (<2 % of trials) triggered a release of the weight during imagined movement. However, the SAS frequently evoked the planned postural response (suppression of bicep brachii muscle activity) irrespective of the task or timing of stimulation (even during periods of postural hold without preparation). These findings provide evidence that neural processes mediating the preparation and release of the focal motor task (release of the weight) are markedly attenuated or absent during imagined movement and that postural and focal components of the task are prepared independently.

Keywords

Imagined movement Movement preparation Startle Contingent negative variation 

Notes

Acknowledgments

We thank the volunteers for these experiments, and the technical assistance from Mr. Di Zhang. J.E. was supported by a Grant from NIH T32 HD057845 and ANC by a Grant from the Natural Sciences and Engineering Research Council of Canada (PDF-357177).

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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • Jeremy S. Eagles
    • 1
  • Anthony N. Carlsen
    • 1
    • 2
  • Colum D. MacKinnon
    • 1
    • 3
  1. 1.Department of Physical Therapy and Human Movement Sciences, Feinberg School of MedicineNorthwestern UniversityChicagoUSA
  2. 2.School of Human Kinetics, Faculty of Health SciencesUniversity of OttawaOttawaCanada
  3. 3.Department of NeurologyUniversity of MinnesotaMinneapolisUSA

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