Figure 4.

Peak velocity of the accommodative and disaccommodative response versus amplitude (A, B) and starting point (C, D) of the response in the fixed near condition. For accommodation, the peak velocity showed a decrease with increasing starting point (C). The intercepts of the linear regressions for the different experiments varied according to the maximum response amplitude available to each monkey (regression equations: monkey 34: no significant fit; 96: y = −2.4735x + 14.3841, r² = 0.75, P < 0.0001; 54(1): y = −2.0138x + 20.6698, r² = 0.85, P < 0.0001; 54(2): y = −2.8977x + 24.9081, r ² =0.57, P < 0.0001; 111: y = −2.9271x + 27.9468, r ² = 0.73, P < 0.0001). For disaccommodation (D), peak velocity is not related to starting point of the response. The peak velocities are separated along the various starting points of the experiments.