Fig. 3.

(A) Pseudo-t-statistical map showing the PMBR localised to motor cortex for one run of a single representative subject (radiological view). (B) Average time frequency spectrograms extracted from individual subject PMBR location for the three contraction durations (top panel shows 2-s task duration, middle 5-s task duration and the bottom panel shows 10-s task duration). Spectrograms show the relative change in power for each frequency band where baseline was 16–24 s (blue box). Time zero is cessation of the contraction. (C) Average time courses of beta band (15–30 Hz) amplitude for the three task durations from the peak location of the PMBR across 14 subjects. Responses are aligned to contraction offset (time = 0 s). Red line shows the response to 2-s task duration, green line response to the 5-s task duration and blue line to the 10-s task duration. Error bars show the standard error across subjects. (D–F) Measures from Weibull curves fitted to the PMBR showing effects of task duration. All times reported on y-axes are measured relative to contraction offset. (D) The amplitude of the PMBR peak (R-square 0.98), (E) the time at which peak of PMBR occurs (R-square 0.92) and (F) the time taken for rebound to return to baseline (R-square 0.01). Error bars show the standard error. Blue dashed line shows linear fit of the data.