Pupil Responses During Interactive Conversation.

This was a secondary analysis of data from an earlier study, so it did not collect new conversations or outcomes. The sample was 12 pairs of older adults with normal hearing, so it does not show what pupil responses do in people with hearing loss or communication difficulties. The conversations were a structured spot-the-difference task, not ordinary conversation, and participants looked at their partner for a median of less than 5% of the time. Pupil responses were standardized within participants, so the curves show relative changes within each person, not an absolute pupil size. Many factors can change pupil size, including light, focus, blinking, and emotional arousal, so the model cannot prove that a pupil change means listening or speaking effort. Some pupil recordings were excluded: 35 signals, about 18.2%, plus 15 more, about 7.8%, for equipment problems, and 31 of the first group came from four participants.

This work was funded by the William Demant Fonden (Grant 21-2520). The authors declared no potential conflicts of interest.

Do not read pupil dilation as a clinical measure of listening effort or hearing difficulty. The study tested normal-hearing older adults in a lab task, used standardized pupil responses, and did not show that pupil measures can assess the people these therapists treat.