Figure 9
Nonlinear main-sequence behavior of the model. (a) Red dots: Saturating amplitude-peak eye velocity relation (Eq. (5)) for the default input current (σpop = 0.5 mm; β = 0.03; I0 = 3.0 pA) applied at 10 different sites. Blue dots: peak eye velocity of saccades evoked at sites T = 15, 20, 30 and 40 deg, respectively, for input currents with different input population sizes (from 0.05 to 1.0 mm), and fixed β. Purple dots: peak eye velocity of saccades evoked at the same sites, for input currents (σpop = 0.5 mm) with changing (β, I0), which kept the number of SC spikes constant. Green dots: same, for input currents with changing (β, I0), keeping the number of input-layer spikes constant (compare with Fig. 1a). (b) The model saccades all follow the strict linear relationship (Eq. 6) for all stimulation conditions, and for all fast and slow saccades of (a).
