Kubli LR, et al. - Researchers evaluated the ability of blast-exposed Military Service Members to localize speech sounds in quiet and in multisource environments with 1 or 2 competing talkers. For localizing sounds in complex acoustic environments blast-exposed participants had more difficulty vs non-blast-exposed participants. The need to develop new diagnostic tests using complex listening tasks that involve multiple sound sources that require speech segregation and comprehension was highlighted by this apparent deficit in spatial hearing ability.