Smits, CasFesten, Joost M.Swanepoel, De WetMoore, David R.Dillon, Harvey2023-08-212023-08-212022-10-25Smits, C. Festen, J.M., Swanepoel, D.W. et al. 2022, 'The one-up one-down adaptive (staircase) procedure in speech-in-noise testing : standard error of measurement and fluctuations in the track', Journal of the Acoustical Society of America, vol. 152, no. 4, pp. 2357-2368, doi : 10.1121/10.0014898.0001-496610.1121/10.0014898http://hdl.handle.net/2263/91996The one-up one-down adaptive (staircase or up-down) procedure is often used to estimate the speech recognition threshold (SRT) in speech-in-noise testing. This article provides a brief historical overview of the one-up one-down procedure in psychophysics, discussing the groundbreaking early work that is still relevant to clinical audiology and scientific research. Next, this article focuses on two aspects of the one-up one-down adaptive procedure: first, the standard error of measurement (SEM) and, second, the fluctuations in the track [i.e., the standard deviation of the signal-to-noise ratios of the stimuli within the track (SDtrack)]. Simulations of ideal and non-ideal listeners and experimental data are used to determine and evaluate different relationships between the parameters slope of the speech recognition function, SRT, SEM, and SDtrack. Hearing loss and non-ideal behavior (inattentiveness, fatigue, and giving up when the task becomes too difficult) slightly increase the average value of SDtrack. SDtrack, however, poorly discriminates between reliable and unreliable SRT estimates.en© 2022 Author(s). licensed under a Creative Commons Attribution (CC BY) license.Speech-in-noise testingPsychophysicsSpeech recognition threshold (SRT)Speech-in-noise (SIN)Standard error of measurement (SEM)Article