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Speed-accuracy Trade-off in Dwell-based Eye Pointing Tasks at Different Cognitive Levels

Speed-accuracy Trade-off in Dwell-based Eye Pointing Tasks at Different Cognitive Levels. Xinyong Zhang, Pianpian Xu , Qing Zhang and Hongbin Zha . In Proceedings of the 1st international workshop on pervasive eye tracking & mobile eye-based interaction  (PETMEI '11). 2011.

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Speed-accuracy Trade-off in Dwell-based Eye Pointing Tasks at Different Cognitive Levels

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  1. Speed-accuracy Trade-off in Dwell-based Eye Pointing Tasks at Different Cognitive Levels Xinyong Zhang, PianpianXu, Qing Zhang and HongbinZha. InProceedings of the 1st international workshop on pervasive eye tracking & mobile eye-based interaction (PETMEI '11). 2011. ACM, New York, NY, USA, pp37-42.

  2. Dwell-based selection ACCURACY SPEED MIDAS TOUCH 100ms Typical Dwell time 3000ms Illustration adapted from Leishman

  3. “The cognitive complexity of target searching is a crucial factor that can affect gaze-based interactions.” Previous research is oversimplified

  4. During gaze-basedvisual search the eyes play a dual role of perception and control organs

  5. Conducted an experiment to explore the effects of different dwell times on human performance under different degrees of complexity (cognitive load).

  6. Study • Participants: 21 (10 female, 11 male) non-native English speakers. • Apparatus: EyeLink II eye tracker (in pupil-only mode and at a sampling rate of 250Hz). • repeated measures within-subject design • Dwell time: Four dwell time levels: 450, 650, 850 and 1100 ms • 3 levels of complexity

  7. For non-native English speakers, different lengths of text strings imply different complexities of visual search. Table showing the 3 levels of complexity

  8. Visual search interface

  9. searching time increased withthe increase of cognitive complexity Average eye searching time by combination of task complexity and dwell time.

  10. A dwell time of 850ms would be suitable for the targets labeled using a simple word. Error rate by combination of task complexity and dwell time.

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