Heterophonic auditory adaptation to critical and noncritical bandwidths

Auditory adaptation effects were measured for narrow bands of noise both within and outside of the critical band for 1 000 Hz. In keeping with previous research, a pure-tone condition resulted in more adaptation than any of the noise band conditions. However, as the noise bands were increased in width, a significant decrease in adaptation was observed, which is not in agreement with earlier findings. Adaptation results converted to theoretical auditory units show a trend which conforms to the Hood-Weiler model for loudness coding.