In order to compare the temporary threshold shift (TTS) produced by bands of thermal noise with that produced by pure tones, eight ears (four subjects) were exposed to pure tones of 500 and 3200 cps, and to noise bands 5 cps, one‐third octave, and one octave wide, centered at these same frequencies. The exposures were at a sound‐pressure level of 110 db. After exposure, the subject tracked his 4000 cps threshold for 3 min and then his 500, 1000, 2000, 4000, and 6000 cps thresholds for the next 12 min on a Békésy type audiometer. The threshold shifts at these frequencies were found to be essentially the same regardless of the exposure stimulus type. The threshold shifts from exposures in the 500 cps region were very small, but the “bounce” phenomenon was particularly prominent.