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Geoffrey Tien

 

Publications by Geoffrey Tien (bibliography)

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2012
 
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Tien, Geoffrey, Atkins, M. Stella and Zheng, Bin (2012): Measuring gaze overlap on videos between multiple observers. In: Proceedings of the 2012 Symposium on Eye Tracking Research & Applications 2012. pp. 309-312. Available online

For gaze-based training in surgery to be meaningful, the similarity between a trainee's gaze and an expert's gaze during performance of surgical tasks must be assessed. As it is difficult to record two people's gaze simultaneously, we produced task videos made by experts, and measured the amount of overlap between the gaze path of the expert surgeon and third-party observers while watching the videos. For this investigation, we developed a new, simple method for displaying and summarizing the proportion of time during which two observers' points of gaze on a common stimulus were separated by no more than a specified visual angle. In a study of single-observer self-review and multiple-observer initial view of a laparoscopic training task, we predicted that self-review would produce the highest overlap. We found relatively low overlap between watchers and the task performer; even operators with detailed task knowledge produce low overlap when watching their own videos. Conversely, there was a high overlap among all watchers. Results indicate that it may be insufficient to improve trainees' eye-hand coordination by just watching a video. Gaze training will need to be integrated with other teaching methods to be effective.

© All rights reserved Tien et al. and/or ACM Press

 
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Atkins, M. Stella, Jiang, Xianta, Tien, Geoffrey and Zheng, Bin (2012): Saccadic delays on targets while watching videos. In: Proceedings of the 2012 Symposium on Eye Tracking Research & Applications 2012. pp. 405-408. Available online

To observe whether there is a difference in eye gaze between doing a task, and watching a video of the task, we recorded the gaze of 17 subjects performing a simple surgical eye-hand coordination task. We also recorded eye gaze of the same subjects later while they were watching videos of their performance. We divided the task into 9 or more sub-tasks, each of which involved a large hand movement to a new target location. We analyzed the videos manually and located the video frame for each sub-task where the operator's saccadic movement began, and the frame where the watcher's eye movement began. We found a consistent delay of about 600 ms between initial eye movement when doing the task, and initial eye movement when watching the task, observed in 96.3% of the sub-tasks. For the first time, we have quantified the differences between doing and watching a manual task. This will help develop gaze-based training strategies for manual tasks.

© All rights reserved Atkins et al. and/or ACM Press

2008
 
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Tien, Geoffrey and Atkins, M. Stella (2008): Improving hands-free menu selection using eyegaze glances and fixations. In: Rih, Kari-Jouko and Duchowski, Andrew T. (eds.) ETRA 2008 - Proceedings of the Eye Tracking Research and Application Symposium March 26-28, 2008, Savannah, Georgia, USA. pp. 47-50. Available online

 
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