Many of the items in the “Speech, Spatial, and Qualities of Hearing” scale questionnaire [S. Gatehouse and W. Noble, Int. J. Audiol.43, 85–99 (2004)] are concerned with speech understanding in a variety of backgrounds, both speech and nonspeech. To study if this self-report data reflected informational masking, previously collected data on 414 people were analyzed. The lowest scores (greatest difficulties) were found for the two items in which there were two speech targets, with successively higher scores for competing speech (six items), energetic masking (one item), and no masking (three items). The results suggest significant masking by competing speech in everyday listening situations.
Agus, T. R., Akeroyd, M. A., Noble, W., & Bhullar, N. (2009). An analysis of the masking of speech by competing speech using self-report data (L). The Journal of the Acoustical Society of America, 125(1), 23-26. https://doi.org/10.1121/1.3025915