Viemeister and Wakefield also presented the tones when there was a noise background that stopped just when the tones were presented, but was on in the time between the tones. The multiple integrator theory says that you would not be able to hear two tones better than one in this situation because to add the energy of the two tones you need an integrator that integrates for 120 ms, but that integrator will also have to add in the noise between the tones, making it harder to hear them. Multiple looks theory says that it shouldnŐt matter if there is noise between the tones.