Figure 7.

Action potential firing in neurons from motor cortex (area 4) during spindles. A, Example of typical simultaneous field potentials and juxtacellular recordings (bottom traces) illustrating bursting at termination of spindles compared to EEG recordings (top traces). The shaded box on the juxtacellular trace is expanded below. B, Histograms of spikes count occurring 1000 ms (bins of 5 ms) around spindles onset (top) and waning (bottom). Note that spikes count is higher at termination than at onset. C, Proportion of neurons that fire at spindle termination: 86.36% (white area) had unchanged firing rate, while 9.09% (gray area) increased their firing rate without bursting and 4.55% (black area) increased their firing rate while bursting.