Spectral responses of individual regions (rows) relative to neuronal spiking from each VTA cluster (columns). Top, cell-averaged probability distributions of time of maximum beta power relative to spike times. Horizontal dotted lines, 95% confidence interval of null distribution. Bottom, average (speed-controlled subtracted) LFP spectrogram responses to spike times. For each cell, a speed-matched control spectrogram was subtracted from its corresponding spike-averaged raw spectrogram (Figure S7I). For each panel, the two horizontal dashed black lines represent the beta-frequency range. Note that putative VTA glutamatergic cell spiking (cluster #2) precedes a strong increase in cross-regional beta power.
