The fine structure of the recovering auditory detection threshold

Detection thresholds were gathered for a 2 kHz Gaussian-shaped probe (stand ard deviation= 0.5 ms), centered at intervals of as little as half a millis econd over 0-30 ms following a 200 ms, 97 dB SPL, 2 kHz tone. Surprisingly, there were small, sudden rises and falls superimposed on each subject's ge nerally smooth recovery. Even more obvious were nonmonotonicities in the st andard deviation of the cumulative normal fitted to each threshold's psycho metric function. (C) 1999 Acoustical Society of America. [S0001-4966(99)049 05-X].