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Analyze Waveform Shape

Electric Eel Waveform Analyzer generates quantitative data summarizing the geometrical structure of EOD waveforms. Waveforms are subdivided into Homologous Segments. The duration, amplitude and area of each segment are then calculated. The following steps are involved:

1. Each waveform is divided into 1 – 5 homologous Phases, with P1 being the dominant positive phase. Phases preceding P1 are labeled P0 and P-1 from right to left. Phases following P1 are labeled P2 through P4 from left to right. Phases are separated by Zero Crossovers and by the Start and End of the EOD.

2. Each phase is divided into an ascending and descending limb at the Peak Amplitude.

3. Each limb is divided into two sections at the position of the maximum slope gradient (corresponding to the maximum Derivative value). Hence, a monophasic EOD is divided into 4 sections, a biphasic EOD into 8 sections, and a 6-phase EOD into 24 sections.

4. The following information is computed for each of the 4 – 24 Segments described above. The full data set for a waveform can be exported to Excel (see File - Save Peak Information).

i. Start and end amplitude measured in arbitrary units.

ii. Start and end time: Durations and Timings are measured from real Sample Points (for automatically selected peaks and positions of maximum derivatives) or from interpolated positions between real points (for duration cut-off thresholds and manually selected peaks). Interpolation of duration cut-off thresholds is based on Triangulation Interpolation .Interpolation of manually selected peaks is based on Cubic Spline Interpolation.

iii. Area – calculated by the integration of amplitude and duration.

5. Options: i. minimum peak % setting (Options - Set Constants) controls which phases are Valid Phases. ii. Do not use Zero Crossovers for Durations (Options - General Preferences) determines whether the beginning and end of all phases of an EOD waveform (except beginning of first phase and end of last phase) are measured at the Duration Cut-off % or at the Zero Crossovers. iii. Duration Cut-off % (Options: Set Constants) controls the cut-off % for duration thresholds. iv. Duration Cut-off % Calculated as % of:(Options: Set Constants) selects reference for duration cut-off % (% of each peak, P1, P1+P2, Peak-to-Peak Amplitude).

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