Adaptive 3-down 1-up tracking with 2 dB steps estimates spectral ripple thresholds

Evidence

The standard was generated using a spectral contrast c equal to 0. The amplitude of each stimulus was adjusted to an overall level of 60 dB sound pressure level (SPL). Independent noise stimuli were presented on each observation interval. The stimulus duration was 400 ms. A 400 ms pause was used between the stimuli. Thresholds were estimated using an adaptive psychophysical procedure employing 60 trials. The signal contrast level was reduced after three consecutive correct responses and increased after a single incorrect response. Initially the contrast was varied in a step size of 2 dB, which was reduced to 0.5 dB after three reversals in the adaptive track (Levitt 1971 ). — Dijk, Pim van, Physiology, Psychoacoustics and…, 1823

Categorization

• DEFINE: Describes the adaptive procedure for SMT measurement — useful methodological detail for psychoacoustics.
• corroborated: 3 independent passages support this claim — Dijk, Pim van, Physiology, Psychoacoustics and…, 1823