Abstract
Mind wandering is a ubiquitous phenomenon where attention involuntarily shifts from task-related thoughts to internal task-unrelated thoughts. Mind wandering can have negative effects on performance; hence, intelligent interfaces that detect mind wandering can improve performance by intervening and restoring attention to the current task. We investigated the use of eye gaze and contextual cues to automatically detect mind wandering during reading with a computer interface. Participants were pseudorandomly probed to report mind wandering while an eye tracker recorded their gaze during the reading task. Supervised machine learning techniques detected positive responses to mind wandering probes from eye gaze and context features in a user-independent fashion. Mind wandering was detected with an accuracy of 72 % (expected accuracy by chance was 60 %) when probed at the end of a page and an accuracy of 67 % (chance was 59 %) when probed in the midst of reading a page. Global gaze features (gaze patterns independent of content, such as fixation durations) were more effective than content-specific local gaze features. An analysis of the features revealed diagnostic patterns of eye gaze behavior during mind wandering: (1) certain types of fixations were longer; (2) reading times were longer than expected; (3) more words were skipped; and (4) there was a larger variability in pupil diameter. Finally, the automatically detected mind wandering rate correlated negatively with measures of learning and transfer even after controlling for prior knowledge, thereby providing evidence of predictive validity. Possible improvements to the detector and applications that utilize the detector are discussed.
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Acknowledgments
We would first like to thank our collaborators at the University of Memphis for assistance with data collection. We also thank Kris Kopp, Caitlin Mills, Nigel Bosch, Jennifer Neale, Jacqueline Kory, Jonathan Cobian, and Matthew Hunter for help with data collection and analysis. The authors would also like to thank the individuals who reviewed the initial draft of this paper prior to publication. This research was supported by the National Science Foundation (NSF) (ITR 0325428, HCC 0834847, DRL 1235958).
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Appendix 1
Appendix 1
1.1 Sample items from learning assessments
1.1.1 Sample item from posttest
Which scenario would be the best to use a double blind study?
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Researchers are testing the relationship between test anxiety and GPA (thematic miss)
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Researchers are testing the effects of lotion on making people look younger (correct answer)
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Researchers are testing the effect of a new soap on bacteria cells (near miss)
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None of the above (distractor)
1.1.2 Sample item from transfer test
A sports psychologist tested whether visualizations alone have an impact on muscle tone. Visualization involves picturing an activity (e.g., shooting a basketball) in your mind, but not physically doing the activity. Earlier studies compared physical exercise only to a group that did physical and visualization exercise, but the sports psychologist added two groups to her study: (1) visualization exercise only and (2) a control group that did neither. All participants were first given a standardized test of muscle tone (biceps) by a trained professional. Participants were randomly assigned to one of the four conditions. For four weeks, participants (except the control group) spent 20 minutes every morning performing exercises (physical, visualized, or physical and visualized) designed to strengthen biceps. After four weeks, bicep muscle tone was measured by the same expert, unaware of participants’ condition. Both physical exercise and visualization exercise had significant effects on muscle tone, confirming earlier results that visualization exercise effectively increases muscle tone. The researcher repeated the study and found the same results.
The conclusions being drawn by the researchers are...
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Causal because the researcher measured muscle tone before and after the treatment conditions.
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Correlational because the researcher measured muscle tone before and after the treatment conditions.
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Causal because the participants were randomly assigned to conditions (correct answer)
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Correlational because the participants were randomly assigned to conditions. Performance on the learning assessments is shown in Table 10.
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Bixler, R., D’Mello, S. Automatic gaze-based user-independent detection of mind wandering during computerized reading. User Model User-Adap Inter 26, 33–68 (2016). https://doi.org/10.1007/s11257-015-9167-1
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DOI: https://doi.org/10.1007/s11257-015-9167-1