docs: def updateSignal(self, xdata, ydata, plotname=None):
          """Updates the trace of the outgoing signal
  
          :param xdata: time points of recording
          :param ydata: brain potential at time points
          """
          if plotname is None:
              plotname = self.responsePlots.keys()[0]
          self.responsePlots[plotname].updateData(axeskey='stim', x=xdata, y=ydata)