Fig. 2.

Three examples of the effect of restricting the number of ICs on ICA source projections output to between 2 and 9 ICs. The ECAP source, visually identified, is in bold and identified by a star. For S3 stimulation on electrode 17 anodic-first stimulation, two sources represented the ECAP. This was the only case in which this occurred. Note that the concatenation order for each number of ICs is random and thus different for each number of ICs. Also note that it is difficult to visually distinguish in the figure between neural responses and artifact spikes in the concatenated waveforms. These are distinguished in practice by the latency delays of the neural response which are more obvious in the de-concatonated responses (see Fig. 3). In the bold waveforms here, sometimes artifact spikes occur along with neural responses.