Moving In Time: Neurons, Clocks, and Rhythmic Movements

摘要: When tapping a desired frequency, subjects tend to drift away from this target frequency. This compromises the estimate of correlation between inter-tap intervals (ITIs) as predicted by two-level model Wing and Kristofferson which consists an internal timer (‘clock’) motor delays. Whereas previous studies on timing rhythmic attempted eliminate drift, we compared production three constant frequencies (1.5, 2.0, 2.5 Hz) sequences with linearly decreasing interval (ITI) (corresponding increase in frequency 1.5 Hz). For all conditions synchronization-continuation paradigm was used. Tapping forces electromyograms index-finger flexor extensor were recorded ITIs derived yielding variability parameters, i.e. clock variances. Electromyographic recordings served study influence peripheral part tap event. The condition increasing more difficult perform, evidenced deviation intended ITIs. In general, affected force level, variability, muscle co-activation. Parameters for ITI comparable those found conditions. That is, although intentional is different properties both forms are remarkably similar described well Wing-Kristofferson model. Adapted from: A. N. Vardy, Daffertshofer, P. J. Beek, drift. Exp Brain Res, 192(4):615-625, 2009.