Pupillometry as an Objective Measure of Sustained Attention in Young and Older Listeners.

Thirteen of the 33 young participants were excluded because they performed poorly on the hardest condition, so the young pupil results apply mainly to people who could complete the demanding task. The older group was a self-selected, high-functioning sample with near-normal hearing and normal cognitive screening, so findings may not transfer to older clients with hearing loss, cognitive decline, or eye conditions. The task used artificial tone streams, not speech or real listening environments, so it is unclear how pupil responses relate to everyday conversation. The older tracking task was easier than the young task and performance was better than expected, which may have reduced the chance of seeing individual differences. Pupil analysis included only successful trials, so pupil activity during failed or disengaged trials was not measured. The paper did not name a single primary outcome, so the main conclusion depends on which of the two aims is emphasized.

Funding was named as European Commission Horizon2020 and Health Services and Delivery Research Programme. The text does not report a separate author conflict-of-interest disclosure.

Do not conclude that pupil size is a ready clinical test for individual listening effort in older adults. In older listeners, pupil changes tracked task difficulty at group level but did not line up with individual performance, and their pupil responses were smaller and slower.