Fig. 5.

Horizontal deviation for all reaches on the day of permanent inactivation with kainic acid (top) and for reaches 18 days following the same injection (bottom) in monkey R, injection Q. Positive values on the y-axis represent deviations to the right of target, and negative values represent deviations to the left of target. Immediately after injection of kainic acid, reaches with prisms donned missed the target markedly to the right of target. Although training with and without prisms occurred between the day of injection and the 18th day following injection (not shown), reaches remained to the right of target with prisms donned 18 days following permanent inactivation. Adaptation was absent or severely impaired when the monkey was exposed to learned prisms and reverse prisms after inactivation. Means ± SD are shown below each block of prism and no-prism reaches.