Zwicker, E. (1964). "Negative afterimage" in hearing. J. Acoust. Soc. Am. 36, 2413-2415

If a white noise with a half-octave-band suppresion placed anywhere from 300 to 7000 Hz is presented at an over-all sound-pressure level of about 60 dB for 1 min and then switched off, a decaying poststimulatory sound similar to a pure tone is heard for about 10 sec. The pitch of the poststimulatory tone corresponds to a frequency within the suppressed band.