Learning effect observed for the speech reception threshold in interrupted noise with normal hearing listeners.
Traditionally, the speech reception threshold (SRT) for sentences in noise is measured in stationary speech-shaped noise; however, non-stationary masking noises are gradually becoming more common. A previous study by Rhebergen et al. (2006) suggested that a learning effect might be present for the SRT in interrupted noise but not in stationary noise. The current study tested if a stable SRT for female or male speech is reached by determining SRTs in listeners with normal hearing in either stationary or 8-Hz interrupted noise after five replications. Contrary to repeated SRT measurements in stationary noise, a significant improvement was observed for SRTs in interrupted noise with replication. For both speech materials, after five replications, the SRT in interrupted noise improved about 3 to 4 dB in comparison to the first SRT. Stable thresholds seem to be reached after about two replications. This experiment shows that there is a substantial learning effect present in SRT measurements with interrupted noise but not in stationary noise. With non-stationary noise, it is recommended to include a repeated measures design.
Rhebergen
Koenraad S
KS
Department of Clinical and Experimental Audiology, Academic Medical Center, Amsterdam, The Netherlands. k.s.rhebergen@AMC.nl
Versfeld
Niek J
NJ
Dreschler
Wouter A
WA
D000328:Adult; D001301:Audiometry, Pure-Tone; D001309:Auditory Threshold; D005260:Female; D006309:Hearing; D006801:Humans; D007858:Learning; D008297:Male; D009622:Noise / Q000009:adverse effects*; D013069:Speech Reception Threshold Test