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Control Parkinson Cerebellar Cerebellar impaired unimpaired

Group

FIGURE 19.2 Variability of the intertap intervals for the control, PD, and cerebellar groups. For the unilateral cerebellar patients, separate values are shown when performing with the ipsilesional hand (impaired) or contralesional hand (unimpaired). A single value is included for the patients with bilateral cerebellar degeneration, based on the average of the two hands (and included in the impaired bar). (a) SD of the intertap intervals for the fast (500 msec) and slow (900 msec) pacing tones. The bottom two figures show the decomposition of the variability into estimates of the motor (b) and clock delay (c) components. Error bars indicate between-subject standard error.

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