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Pupillometry, the measure of the pupil size, is often used to assess effort but has disadvantages. Analysis of eye movements may provide an alternative, but research has been limited to easy and difficult task demands in younger adults. An effort measure must be sensitive to the whole effort profile, including \u201cgiving up\u201d effort investment, and capture effort in different age groups. The current study comprised three experiments in which younger (n = 66) and older (n = 44) adults listened to speech masked by background babble at different signal-to-noise ratios associated with easy, difficult, and impossible speech comprehension. We expected individuals to invest little effort for easy and impossible speech (giving up) but to exert effort for difficult speech. Indeed, pupil size was largest for difficult but lower for easy and impossible speech. In contrast, gaze dispersion decreased with increasing speech masking in both age groups. Critically, gaze dispersion during difficult speech returned to levels similar to easy speech after sentence offset, when acoustic stimulation was similar across conditions, whereas gaze dispersion during impossible speech continued to be reduced. These findings show that a reduction in eye movements is not a byproduct of acoustic factors, but instead suggest that neurocognitive processes, different from arousal-related systems regulating the pupil size, drive reduced eye movements during high task demands. The current data thus show that effort in one sensory domain (audition) differentially impacts distinct functional properties in another sensory domain (vision).<\/jats:p>","DOI":"10.1162\/jocn_a_02172","type":"journal-article","created":{"date-parts":[[2024,4,29]],"date-time":"2024-04-29T12:51:06Z","timestamp":1714395066000},"page":"1325-1340","update-policy":"https:\/\/doi.org\/10.1162\/mitpressjournals.corrections.policy","source":"Crossref","is-referenced-by-count":16,"title":["Pupil Size and Eye Movements Differently Index Effort in Both Younger and Older Adults"],"prefix":"10.1162","volume":"36","author":[{"given":"Bj\u00f6rn","family":"Herrmann","sequence":"first","affiliation":[{"name":"Rotman Research Institute, North York, Ontario, Canada"},{"name":"University of Toronto, Ontario, Canada"}]},{"given":"Jennifer D.","family":"Ryan","sequence":"additional","affiliation":[{"name":"Rotman Research Institute, North York, Ontario, Canada"},{"name":"University of Toronto, Ontario, Canada"}]}],"member":"281","published-online":{"date-parts":[[2024,6,1]]},"reference":[{"key":"2024061416405685700_bib1","doi-asserted-by":"publisher","first-page":"387","DOI":"10.1037\/0882-7974.13.3.387","article-title":"Aging and movement: Variability of force pulses for saccadic eye movements","volume":"13","author":"Abrams","year":"1998","journal-title":"Psychology and Aging"},{"key":"2024061416405685700_bib2","doi-asserted-by":"publisher","first-page":"14.1","DOI":"10.1167\/7.13.14","article-title":"How many objects can you track? 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