Motor and spatial representations of action: corticospinal excitability in M1 after training with a bimanual skill
- PDF / 1,094,359 Bytes
- 12 Pages / 595.276 x 790.866 pts Page_size
- 55 Downloads / 173 Views
RESEARCH ARTICLE
Motor and spatial representations of action: corticospinal excitability in M1 after training with a bimanual skill Inchon Park1 · John J. Buchanan2 · Austin T. McCulloch2 · Jing Chen3 · David L. Wright2 Received: 26 August 2019 / Accepted: 19 March 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The purpose of the study was twofold: (1) determine if different time delays (30 min or 6 h) between training and a posttraining test with a rhythmic bimanual pattern (90° relative phase) would be associated with different levels of consolidation for the motor and spatial representations of the pattern; and (2) determine if training with the rhythmic bimanual pattern would lead to enhanced corticospinal excitability in M1 linked to changes in motor and spatial performance measures. Coordination accuracy and stability of the 90° pattern improved over practice. Coordination accuracy and stability were the same after a 30-min or 6-h delay between training and the post-training test, indicating equivalent levels of consolidation in the motor representation. The 6-h delay interval resulted in shorter visual recognition times compared to the 30-min delay and was centered on the trained 90° pattern. These findings indicate the consolidation of the spatial representation was more time sensitive compared to the motor representation in the current task. Motor evoked potentials (MEPs) from the first dorsal interosseous muscle (FDI) generated by single-pulse transcranial magnetic stimulation (TMS) were measured at baseline (before training) and at 6-min and 21-min intervals post-training with the 90° pattern. Increased corticospinal excitability in M1 was evidenced by larger MEPs of the FDI muscle at the 6-min interval. This increased excitability after training is a novel finding after training with a difficult and initially unstable rhythmic bimanual pattern. No significant correlations were found between the MEP data and behavioral data; thus, the increased excitability in M1 may have been linked to the difficulty in performing the pattern, consolidation processes, or both. Keywords Learning · Consolidation · Perception–action · Coordination · TMS · Relative phase
Introduction Motor skill memories are thought to be encoded in both motor and spatial representations of the action (Brooks 1986; Kovacs et al. 2009c; Panzer et al. 2009; Verwey and Wright 2004). The extent of encoding and consolidation of the motor representation of an action can be evaluated with regard to accuracy and stability changes over practice and Communicated by John C. Rothwell. * Inchon Park [email protected] 1
Korea Institute of Sports Science, Seoul, Korea
2
Department of Health and Kinesiology, Perception‑Action Dynamics Lab, Texas A&M University, College Station, TX 77843, USA
3
Department of Kinesiology, Texas A&M University Texarkana, Texarkana, TX 75503, USA
with retests. The extent of encoding and consolidation of the spatial representation of an action can be examined using verbal memory
Data Loading...
