Figure 4.

Neuronal responses to head-fixed preferred cardinal axis rotation during two behavioral states. A, Mean (±SEM) IFR gain values for each neuronal category (air-on, red: n = 8; NEM, blue: n = 13; EM, green: n = 6) during default (solid symbols) and flight (open symbols) states, plotted as a function of stimulus frequency (15°/s peak) and peak velocity (0.5 Hz). B, Mean (±SEM) IFR phase values for each neuron, color coded by neuronal category. Neurons are ordered bottom to top by increasing spontaneous firing rate, with air-on neurons (red) at bottom (with arbitrary within-group ordering), then NEM (blue) and EM (green) neurons (using same ordering as shown in Fig. 3B). Phases were recorded during head-fixed rotational motion about that neuron's preferred axis (square = x-axis, circle = y-axis, triangle = z-axis) during default (solid symbols) and flight (open symbols) states, averaged across stimulus frequency and velocity. Note that phase values of −90° and 0° correspond to responses that are in phase with stimulus angular position and velocity, respectively. Spont, Spontaneous.