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# scipy.signal.vectorstrength

scipy.signal.vectorstrength(events, period)

  Determine the vector strength of the events corresponding to the given period.

  The vector strength is a measure of phase synchrony, how well the timing of the events is synchronized to a single period of a periodic signal.

  If multiple periods are used, calculate the vector strength of each. This is called the “resonating vector strength”.

  Parameters:
    events 1D array_like

      An array of time points containing the timing of the events.

    period float or array_like

      The period of the signal that the events should synchronize to. The period is in the same units as events. It can also be an array of periods, in which case the outputs are arrays of the same length.

  Returns:
    strength float or 1D array

      The strength of the synchronization. 1.0 is perfect synchronization and 0.0 is no synchronization. If period is an array, this is also an array with each element containing the vector strength at the corresponding period.

    phase float or array

      The phase that the events are most strongly synchronized to in radians. If period is an array, this is also an array with each element containing the phase for the corresponding period.

  References

  van Hemmen, JL, Longtin, A, and Vollmayr, AN. Testing resonating vector

    strength: Auditory system, electric fish, and noise. Chaos 21, 047508 (2011); DOI:10.1063/1.3670512.

  van Hemmen, JL. Vector strength after Goldberg, Brown, and von Mises:

    biological and mathematical perspectives. Biol Cybern. 2013 Aug;107(4):385-96. DOI:10.1007/s00422-013-0561-7.

  van Hemmen, JL and Vollmayr, AN. Resonating vector strength: what happens

    when we vary the “probing” frequency while keeping the spike times fixed. Biol Cybern. 2013 Aug;107(4):491-94. DOI:10.1007/s00422-013-0560-8.