Figure 3.

Spike patterns lack topological clustering in the dorso-ventral axis. (A) The multi-electrode arrays are inserted in the spinal cord gray matter along the axis of high cellular segregation (D-V direction). (B) Spiking pattern of sorted units (~300 neurons) concurrent with motor nerves during rhythmic movement. (C) Layout of electrodes on a shank. (D) The recording sites (black dots) are used to locate the strongest sources along the shank using trilateration. Three sample units indicated in colors, all units in gray. (E) The irregularity of spiking vs. depths in DV-axis. Each circle is the mean CV₂ of a neuron. (F) The population distribution of mean spiking irregularity (CV₂) as a function of depth in DV-axis. A difference between the distributions could not be detected. Adapted with permission (Petersen and Berg, 2016).