Monaural loudness‐adaptation measurements were made at several suprathreshold levels for 500 and 4000 Hz with normal‐hearing subjects. A unique procedure used the subject as a null device and adaptively varied the signal level over time until no change in loudness was indicated. The results indicated no monaural loudness adaptation. These findings support similar data obtained by other investigators using delayed‐balance procedures. It was concluded that the adaptation effects observed in experiments using some form of simultaneous, binaural stimulation apparently are due to binaural interaction and may reflect central as well as peripheral influences.