Figure 3.

Units responding to the vestibular search stimulus were further tested for their responsiveness to 10° ramp-and-hold roll body and head rotation (A), 60° ramp-and-hold hindlimb extension movement (B), and both movements delivered simultaneously. C: raw neural data were sampled at 25 kHz. D1: unit activity was isolated using template-matching and response histograms were generated and fit by a model of low and high pass filtered limb and body position and velocity signals using least squares nonlinear regression. D2: the average spike-sorted waveforms (insets on right) were equivalent across the trial, indicating that activity was sampled from the same neuron throughout the recordings. E: mean firing frequency (bin width, 0.25 s).