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Oculomotor behavior and perceptual strategies in complex tasks

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dc.contributor.author Pelz, Jeff en_US
dc.contributor.author Canosa, Roxanne en_US
dc.date.accessioned 2006-12-18T17:10:24Z en_US
dc.date.available 2006-12-18T17:10:24Z en_US
dc.date.issued 2001-11 en_US
dc.identifier.citation Vision Research 41N25 (2001) 3587-3596 en_US
dc.identifier.issn 0042-6989 en_US
dc.identifier.uri http://hdl.handle.net/1850/3069 en_US
dc.description RIT community members may access full-text via RIT Libraries licensed databases: http://library.rit.edu/databases/
dc.description.abstract While we know a great deal about the dynamics and characteristics of eye movements in relatively simple tasks performed under reduced laboratory conditions, we know less about oculomotor behavior in complex, multi-step tasks. Complex tasks are not necessarily difficult. Part of the transition from 'hard' to 'easy' in completing complex tasks is the gradual reduction in conscious effort required to complete the sub-tasks. We are interested in learning whether high-level perceptual strategies can aid that transition. In the past, subjects performed relatively simple tasks or the eye movements themselves were the instructed task. But outside the laboratory vision is a tool, not the task. To study the oculomotor system in its native mode, we developed a wearable eyetracker that allows natural eye, head and whole-body movements. Using the over-learned, common task of hand-washing, we measured the global characteristics of fixation duration, saccade amplitude, and the spatial distribution of fixation positions. An important observation was the emergence of higher-order perceptual strategies in the complex task: while most fixations were related to the immediate action, a small number of fixations were made to objects relevant only to future actions. Based on a control task that differed only in the high-level goal, we conclude that the look-ahead fixations represent a task-dependent strategy, not a general behavior elicited by the salience or conspicuity of objects in the environment. We propose that the strategy of looking ahead to objects of future relevance supports the conscious percept of an environment seamless in time as well as in space. en_US
dc.description.sponsorship The authors wish to acknowledge Jason Babcock, who is largely responsible for the current design and construction of the wearable eyetracker, and Amy Silver, who performed much of the data analysis. The work was supported in part by an RIT College of Science Project Initiation Grant. en_US
dc.format.extent 254325 bytes en_US
dc.format.mimetype application/pdf en_US
dc.language.iso en_US en_US
dc.publisher Elsevier Science en_US
dc.relation.ispartofseries vol. 41 en_US
dc.relation.ispartofseries no. 25 en_US
dc.subject Complex tasks en_US
dc.subject Eye movements en_US
dc.subject Oculomotor behavior en_US
dc.subject Perceptual strategies en_US
dc.subject Vision en_US
dc.title Oculomotor behavior and perceptual strategies in complex tasks en_US
dc.type Article en_US
dc.identifier.url http://dx.doi.org/10.1016/S0042-6989(01)00245-0

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