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As such, an increase in the cognitive and\/or visual demands can lead to a mental overload which can be detrimental for driving safety. Compiling evidence suggest that eye and head movements are relevant indicators of visuo-cognitive demands and attention allocation. This study aims to investigate the effects of visual degradation on eye-head coordination as well as visual scanning behavior during a highly demanding task in a driving simulator. A total of 21 emmetropic participants (21 to 34 years old) performed dual-task driving in which they were asked to maintain a constant speed on a highway while completing a visual search and detection task on a navigation device. Participants did the experiment with optimal vision and with contact lenses that introduced a visual perturbation (myopic defocus). The results indicate modifications of eye-head coordination and the dynamics of visual scanning in response to the visual perturbation induced. More specifically, the head was more involved in horizontal gaze shifts when the visual needs were not met. Furthermore, the evaluation of visual scanning dynamics, based on time-based entropy which measures the complexity and randomness of scanpaths, revealed that eye and gaze movements became less explorative and more stereotyped when vision was not optimal. These results provide evidence for a reorganization of both eye and head movements in response to increasing visual-cognitive demands during a driving task. Altogether, these findings suggest that eye and head movements can provide relevant information about visuo-cognitive demands associated with complex tasks. Ultimately, eye-head coordination and visual scanning dynamics may be good candidates to estimate drivers\u2019 workload and better characterize risky driving behavior.<\/jats:p>","DOI":"10.1371\/journal.pone.0240201","type":"journal-article","created":{"date-parts":[[2020,12,31]],"date-time":"2020-12-31T14:07:00Z","timestamp":1609423620000},"page":"e0240201","update-policy":"https:\/\/doi.org\/10.1371\/journal.pone.corrections_policy","source":"Crossref","is-referenced-by-count":18,"title":["Eye-head coordination and dynamic visual scanning as indicators of visuo-cognitive demands in driving simulator"],"prefix":"10.1371","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6964-8046","authenticated-orcid":true,"given":"Laura","family":"Mikula","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6667-8031","authenticated-orcid":true,"given":"Sergio","family":"Mej\u00eda-Romero","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Romain","family":"Chaumillon","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Amigale","family":"Patoine","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Eduardo","family":"Lugo","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6155-749X","authenticated-orcid":true,"given":"Delphine","family":"Bernardin","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jocelyn","family":"Faubert","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"340","published-online":{"date-parts":[[2020,12,31]]},"reference":[{"issue":"23","key":"pone.0240201.ref001","doi-asserted-by":"crossref","first-page":"2348","DOI":"10.1016\/j.visres.2010.05.021","article-title":"Vision and driving.","volume":"50","author":"C Owsley","year":"2010","journal-title":"Vision Res"},{"issue":"4","key":"pone.0240201.ref002","doi-asserted-by":"crossref","first-page":"192","DOI":"10.1016\/S0008-4182(00)80030-7","article-title":"Vision standards for driving in Canada and the United States. 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