Cerebellar Motor Learning: When Is Cortical Plasticity Not Enough?
Figure 4
Model Performance Before, During, and After Training with a Retinal-Slip Signal Delayed by 0.1 s
(A) Change in retinal-slip amplitude with training. It initially declines much more slowly than with an undelayed signal (Figure 3), and eventually increases very rapidly as the system becomes unstable.
(B) System gain for sinusoidal input signals as a function of frequency, measured just before the instability shown in (A). The gains at frequencies above 2.5 Hz are inaccurate.
(C) Effects of delay on correlation between two identical sinusoids at 2.5 Hz. As delay increases from a value of 0 s, the correlation declines from 1.0 to 0 at a delay of 0.1 s, and to −1.0 at a delay of 0.2 s.