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Participant Groups

Subtle Gaze Manipulation for Improved Mammography Training. Srinivas Sridharan , sxs9716@rit.edu, Rochester Institute of Technology Reynold Bailey, rjb@cs.rit.edu, Rochester Institute of Technology Ann McNamara, ann@viz.tamu.edu, Texas A&M University

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Participant Groups

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  1. Subtle Gaze Manipulation for Improved Mammography Training SrinivasSridharan, sxs9716@rit.edu, Rochester Institute of Technology Reynold Bailey, rjb@cs.rit.edu, Rochester Institute of Technology Ann McNamara, ann@viz.tamu.edu, Texas A&M University Cindy Grimm, cmg@cse.wustl.edu, Washington University in St. Louis Participant Groups Introduction • Static group: control group with no SGD • Gaze-directed group 1: SGD used to guide participants along recorded expert scanpath • Gaze-directed group 2: SGD used to guide participants only to regions identified by expert as irregular • Gaze-directed group 3: SGD used to guide participants along adversarial scanpath (away from expert scanpath) A novel gaze manipulation technique called Subtle Gaze Direction (SGD) is used to guide novices as they try to identify abnormalities in digital mammogram images. This approach increases the likelihood of novices correctly identify irregularities compared to static viewing. Subtle Gaze Direction • Perform brief image-space modulations on specific regions in viewer’s peripheral vision to attract their attention. • Viewer’s gaze is monitored by a real-time eye-tracker and modulations are terminated before viewer scrutinizes them with their high-acuity foveal vision. An accuracy measure is defined in terms of hits, close matches, and misses between expert and novice responses. Current fixation: F Desired fixation: A Current saccade: v Desired saccade: w Modulation in region A is terminated when angle θ is small, indicating that the viewer’s gaze is moving towards the target region. Results Previous Work Subtle Gaze Direction:Bailey R., McNamara A., Sudarsanam N., and Grimm C. ACM Transactions on Graphics. August 2009. Improving Search Task Performance Using Subtle Gaze Direction: McNamara A., Bailey R., and Grimm C. ACM Transactions on Applied Perception. September 2009. Experiment Setup • 20 novice participants (4 females, 16 males) • 20 pairs of mammogram images viewed • Asked to identify what they considered to be irregularities by clicking and dragging a mouse to draw circular regions • Participants randomly assigned to one of four groups • Photograph shows experiment setup Acknowledgements This material is based upon work supported by the National Science Foundation under Award No. IIS-0952631. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the National Science Foundation.

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