Fig. 3

Propagation of an SD waveform. a Signals recorded by the four parallel shanks of the 16-channel recording array. Left and middle: baseline OPS and APS waveforms evoked by a single pulse. Right: an SD event in the 16-channel recordings. The blue dotted line denotes the movement of the SD trough in the horizontal direction. b The 4-channels of recording signals along the shank of the recording array. The waveforms of baseline OPS and APS indicate the locations of each recording channel in the different stratums of CA1 region. The hollow triangles denote the movement of the SD trough in the perpendicular direction. The blue shade denotes the burst of population spikes at the onset of SD that are filtered and expanded on the right