Spatial separation of talkers was simulated via head-related transfer functions, not real room acoustics.

Evidence

Target and masker stimuli were three male talkers taken from the Coordinate Response Measure corpus. Head-related transfer functions (HRTFs) were used to position the target sentences at 0° azimuth and the maskers either colocated with the target or at ±45° (Gallun et al. 2013 ; Xie 2013 ). In the first experiment the target sentences were fixed at either 19.5 dB SL (low SL condition) or 39.5 dB SL (high SL condition) above each participant’s speech reception threshold (SRT) in quiet. — Dijk, Pim van, Physiology, Psychoacoustics and…, 1729

Categorization

• corroborated: 2 independent passages support this claim — Dijk, Pim van, Physiology, Psychoacoustics and…, 1729