Echo-fusion thresholds vary widely among hearing-impaired listeners regardless of audiometric thresholds.

Evidence

The echo threshold was defined as the just noticeable delay that determined whether the listeners heard one (the echo stimulus was fused with the leading stimulus) or two clicks. Roberts et al. found large variability across listeners, even when stimuli were presented at the same sensation level for the two groups. Many listeners with hearing loss had higher echo thresholds than those with normal hearing, but not all. As we have seen repeatedly in this text, no correlation was observed between audiometric threshold and echo threshold. — Jennifer Lentz, Psychoacoustics- Perception of Normal…, 1590

Categorization

• XREF: The repeated finding that audiometric threshold predicts little about temporal/binaural processing echoes the same dissociation seen throughout this text and connects to the reader’s overarching question about what audiograms fail to capture.