Fig. 1.

Measures of “informational masking” derived from data collected by Freyman et al. (2001; panel a) and Iyer et al. (2010; panel b) in conditions where target speech was presented together different types of two-talker interference. Shown are differences between speech perception scores, averaged over SNRs of −8, −4, and 0 dB, for reference and test conditions. a Scores for test conditions using F-RF presentation from which scores for reference conditions, using FF presentation of the same sounds, were subtracted. b Data obtained by subtracting scores for test conditions with speech interference from a reference condition with two modulated noise signals.