code: def mmGetCellActivityPlot(self, title=None, showReset=False,
                              resetShading=0.25):
      
      cellTrace = self._mmTraces["activeCells"].data
      cellCount = self.getNumColumns()
      activityType = "Cell Activity"
      return self.mmGetCellTracePlot(cellTrace, cellCount, activityType,
                                     title=title, showReset=showReset,
                                     resetShading=resetShading)
docs: Returns plot of the cell activity.
      @param title an optional title for the figure
      @param showReset if true, the first set of cell activities after a reset
                          will have a gray background
      @param resetShading If showReset is true, this float specifies the
      intensity of the reset background with 0.0 being white and 1.0 being black
      @return (Plot) plot