Participant Groups

Acknowledgements

Results

Experiment Setup

Previous Work

Introduction

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.

• 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

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.

• 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.

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.

Current fixation: FDesired fixation: ACurrent saccade: vDesired 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.

• 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)

An accuracy measure is defined in terms of hits, close matches, and misses between expert and novice responses.

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 TechnologyAnn McNamara, ann@viz.tamu.edu, Texas A&M University

Cindy Grimm, cmg@cse.wustl.edu, Washington University in St. Louis

Subtle Gaze Direction