Fig. 3.

Stability of longitudinally monitored spikes. A: mean voltage traces showing spike waveforms (top) and interspike interval (ISI) histograms (bottom) from a single neuron in m2 that was observed in daily recording sessions over 13 days (December 11 to 23, 2012). Scale bar, 50 μV, 1 ms. B: spikes from a second neuron recorded simultaneously in m2. The spikes shown in A and B (sig094a and sig094b) were recorded on the same microwire (channel 94). Scale bar, 50 μV, 1 ms. C: spikes from a third neuron in m2 that was observed in throughout the same 13 days in December and was still present in a follow-up recording session 3 mo later (March 14, 2013). Note the consistency in the shape of the ISI histograms across days despite the increase in spike amplitude. Scale bar, 100 μV, 1 ms.