Spike detector

TAction potential detection from extracellular recording data embedded with baseline fluctuations.

The attached pictures show actual extracelluar recording in different time resolutions (above: x = time (ms); y = current (A)) and the spike detector output (below: x = time (ms); y = 1 on a spike position, 0 elsewhere).

The prevailing problem with the spike detection analysis is that there is a mild baseline fluctuation and the sampling rate can vary among data files. This spike detecting application (recount2) is not bothered by such unwanted fluctuations.

It takes a running average (of any size) and compares the average with a 4 points after the current position. If it satisfies a primary threshold condition, it checks another 4 points forward in time and checks if a second threshold condition is met. This way, the detector picks up only a spike of a desired shape.

resize: downscale data resampler
recount2: spike detector with 2-point sampling