The control of spiral wave parameters by electric current was
investigated in the Belousov-Zhabotinsky (BZ) reaction. It was found
that the wavelength and the period of spiral waves increase by a factor
of up to 3 with electric current (both dc and ac). Using this procedure
spiral waves with a period higher than the period of medium bulk
oscillations were observed. It was found that hysteresis phenomena occur
in the system considered.