Fig. S1. Activity of three groups of caudate neurons aligned with stimulus onset.

Fig. S2. Time courses of time-dependent signals aligned with stimulus onset.

Fig. S3. Regression coefficients of linear regression analysis in individual neurons.

Fig. S4. Correlation coefficients between firing rates and reaction times in individual neurons.

Fig. S5. Rasters and spike density functions for correct and direction error saccades on antisaccade trials.

Fig. S6. Direction error indices in individual neurons.

Fig. S7. Hypothetical BG model with connections between caudate nucleus and other BG nuclei.

Appendix S1. Supplementary methods.

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