Spectral ripple thresholds are measured with a forced-choice flat-versus-modulated comparison
Evidence
Stimuli were 500 ms long with 100 ms ramps, nonharmonic tone complexes with 202 equal amplitude pure-tone frequency components, spaced every 1/33.3 octave from 100 to 6400 Hz. The amplitudes of the pure tones were modulated by a sine wave with a 33 % modulation depth. A three-interval, two-alternative forced choice task was used, with a reference stimulus of 20 ripples per octave (RPO) presented at 65 dBA. The target stimulus initially had 0.5 RPO and the number of ripples was modified using a 1-up/1-down adaptive procedure with a step size of 0.2 RPO. — Dijk, Pim van, Physiology, Psychoacoustics and…, 2095
We used the spectral ripple test presented by (Litvak et al. 2007 ) to estimate the spectral modulation thresholds of each CI user. This task uses a cued two interval, two-alternative, forced choice procedure. In the first interval the standard stimulus was always presented. The standard stimulus had a flat spectrum with bandwidth extending from 350 to 5600 Hz. The signal and the second standard were randomly presented in the other two intervals. Both signals were generated in the frequency domain assuming a sampling rate of 44,100 Hz. — Dijk, Pim van, Physiology, Psychoacoustics and…, 1836
Categorization
- DEFINE: Details the exact stimulus construction and adaptive procedure of the spectral ripple task.
- corroborated: 5 independent passages support this claim — Dijk, Pim van, Physiology, Psychoacoustics and…, 2095; Dijk, Pim van, Physiology, Psychoacoustics and…, 1836
- XREF: connects to: Spectral modulation threshold is the smallest detectable spectral contrast in a stimulus. — Dijk, Pim van, Physiology, Psychoacoustics and…, 1823; Spectral modulation threshold is the smallest detectable spectral contrast in a ripple stimulus; Spectral ripple tasks can confound loudness and edge-frequency cues — Dijk, Pim van, Physiology, Psychoacoustics and…, 2092 (+1 more)
Broader Connections
- Spectral ripple tasks can confound loudness and edge-frequency cues
#complicates(0.85) — Dijk, Pim van, Physiology, Psychoacoustics and…, 2092