Fig. 1. (a) A 100 ms fragment of a real signal. (b) The classification window displays the classified events while the classification process. For each class the time domain (here with a window duration of 2 ms and arbitrary units for the spike amplitude) and phase space spike trajectories are shown. For each class the current firing rate is indicated as well. Here the classification process for the one electrode real signal (a) represented.

Fig. 2. (a) Three templates used for testing. (b) Comparison of deformations introduced by TSA and conventional wavelet thresholding denoising algorithms.

Fig. 3. (a) Autocorelogram of a bursting cell, (b) cross- and autocorrelograms of two synchronized cells and (c) cross- and autocorrelograms of two unsynchronized cells. The abscissa represents a lag in ms and the ordinate-firing rate in spikes/s. The horizontal lines represent confidential levels.

Fig. 4. Two single units characterized by an oscillatory firing pattern. Autocorrelograms (a and c) and power spectrum (b and d) of the first and second unit, respectively. Notice the first unit (left panel) is characterized by oscillation rates 5 Hz, while the second cell (right panel) is characterized by low-frequency oscillations 1 Hz.

Fig. 5. Cumulated distribution of significant peaks detected in the spectrum of single units characterized by oscillatory patterns. All occurrences of significant peaks in the frequency range [0–50] Hz were added together for side I (upper panel) and side II (lower panel). The curves represent the probabilities of occurrence of the peaks at a resolution of 1 Hz. The horizontal line represents a 95% level of significance. The following clusters appeared: [0–2] Hz, [4–6] Hz, [8–10] Hz.

Error rate of USS tested on a sample file of 1003 events distributed into three classes

The error rate is shown without additive noise, with two levels of signal-to-noise ratio (SNR) and with TSA denoising procedure.

Percentages of bursting, syncronized, and oscillatory firing patterns for six patients

Side I corresponds to the first operated hemisphere.