Figure 7.

Stimulus responses can be overridden by secondary stimulation. A, Example raster plots of DE-3 cell responses to stimulation of either: only the ipsilateral P_D neuron; only the contralateral P_V neuron; both simultaneously; P_D followed by P_V^c; P_V^c followed by P_D. B, “Dorsality” (see Materials and Methods) of vector responses to simultaneous or sequential stimulation as a function of time. Lines and area represent mean ± SE. Red areas indicate significantly higher dorsality than in simultaneous case. Blue areas indicate significantly lower dorsality than in simultaneous case. Vertical colored lines indicate timing of stimuli. Rightmost column represents separation (see Materials and Methods). C, Dorsality of responses in specific cell types: DE3 cell ipsilateral (top) and contralateral (bottom) to the stimulated P_D neuron. D, Number of spikes contributed in the first 0.5 s by P_D stimulation with or without preceding P_V^c stimulation (left) and vice versa (right) in N = 26 experiments.