Figure 4.  Visualization of raw signal and collection of spike
waveforms.A - information covering each trial of movement
execution to monitor the uniformity of trials, where black
vertical hatches represent spike occurrence detected using
external hardware threshold discriminator; blue line is the
infrared signal from the analogue IR-pair; thick coloured
horizontal lines are retrieved from the set of digital sensors
representing different kinematic parts of executed movement. B -
the visualization of one trial in 3 sec multi-unit recordings,
where spikes determined by software discriminator are marked
with red dots. C - an expanding view of the same raw signal, in
which the presence of different kinds of spikes is evident; D -
extracted 1.8 ms of spikes waveforms, aligned to the peak of
action potential by spline interpolation method; E - the same
waveforms with 6 truncated samples at the ends, yielded 1.2 ms
waveforms to be filled by the data matrix.  Oliynyk et al. BMC
Neuroscience 2012 13:96   doi:10.1186/