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Non\u2010player characters, as they occur in many games, communicate with the player through dialogue and non\u2010verbal behavior and can have a strong influence on player experience or even on gameplay. In this paper, we evaluate a procedural model designed to synthesize the subtleties of eye motion. More specifically, our model adds microsaccadic jitter and pupil unrest both modeled by 1\/<jats:italic>f<\/jats:italic><jats:sup><jats:italic>\u03b1<\/jats:italic><\/jats:sup>or pink noise to the saccadic main sequence. In a series of perceptual two\u2010alternative forced\u2010choice experiments, we explore the perceived naturalness of different parameters of pink noise by comparing synthesized motions to rendered motion of recorded eye movements at extreme close shot and close shot distances. Our results show that, on average, animations based on a procedural model with pink noise were perceived and evaluated as highly natural, whereas data\u2010driven motion without any jitter or with unfiltered jitter were consistently selected as the least natural in appearance.<\/jats:p>","DOI":"10.1002\/cav.1745","type":"journal-article","created":{"date-parts":[[2017,2,2]],"date-time":"2017-02-02T07:23:30Z","timestamp":1486020210000},"source":"Crossref","is-referenced-by-count":8,"title":["Perceptual evaluation of synthetic gaze jitter"],"prefix":"10.1002","volume":"29","author":[{"given":"Krzysztof","family":"Krejtz","sequence":"first","affiliation":[{"name":"Psychology Department SWPS University of Social Sciences and Humanities Warsaw Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1681-7878","authenticated-orcid":false,"given":"Andrew","family":"Duchowski","sequence":"additional","affiliation":[{"name":"School of Computing Clemson University Clemson SC USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Heng","family":"Zhou","sequence":"additional","affiliation":[{"name":"School of Computing Clemson University Clemson SC USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sophie","family":"J\u00f6rg","sequence":"additional","affiliation":[{"name":"School of Computing Clemson University Clemson SC USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anna","family":"Niedzielska","sequence":"additional","affiliation":[{"name":"National Information Processing Institute Warsaw Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2017,2,2]]},"reference":[{"key":"e_1_2_11_2_1","doi-asserted-by":"crossref","unstructured":"NormoyleA BadlerJB FanT BadlerNI CassolVJ MusseSR.Evaluating perceived trust from procedurally animated gaze.Proceedings of Motion in Games MIG '13 Dublin 2 Ireland;2013. p.119:141\u2013119:148.","DOI":"10.1145\/2522628.2522630"},{"key":"e_1_2_11_3_1","unstructured":"LanceBJ MarsellaSC.A model of gaze for the purpose of emotional expression in virtual embodied agents.Proceedings of the 7th International Joint Conference on Autonomous Agents and Multiagent Systems \u2010 Volume 1 Estoril Portugal;2008. p.199\u2013206."},{"key":"e_1_2_11_4_1","doi-asserted-by":"publisher","DOI":"10.1145\/1394021.1394034"},{"key":"e_1_2_11_5_1","unstructured":"Team B.L.A. 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