Fig. 7.

Comparison of estimated sensitivities (using Eq. 4) with horizontal strabismus angle (mathematically equivalent to vergence angle) and vergence velocity for vergence-only movements (i.e., those without accompanying saccades; examples of such movements can be seen in Fig. 1, highlighted in green). The neuron used in Figs. 5 and 6 is indicated with an asterisk. The size of the dot indicates the r² value, and the color indicates which terms were significant (orange, both; green, neither; blue, horizontal strabismus angle only; purple, vergence velocity only). The vergence velocity term was significant for 50% of the neurons. The outlier in the top-left corner was a divergence velocity neuron that rarely showed any tonic discharge. Crosses represent bootstrap confidence intervals (see methods). deg, Degrees.