Fig. 4.

ABNs with k_V < k_C. The right ABN is cell 13 in Table 1. A: 10° leftward saccade showing the expected decrease in right LR force. There was no evidence of impaired movement mechanics. B: 20° asymmetric convergence in which the right MFT-instrumented eye quickly returned to its preconvergence orbital position. Although the firing rate substantially increased from before to after the movement, muscle force clearly decreased. C: 20° symmetric convergence contributing a point to the cluster at −10° in D. D: the linear firing rate-eye position relationship for vergence (▵; k_V = 1.4 spikes/s per deg) was less steep than that for conjugate movement (○; k_C = 6.2 spikes/s per deg).