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Identification of Distinct Visual Scan Paths for Pathologists in Rare-Element Search Tasks
Alana Lopes1,2, Sean Rasmussen3, Ryan Au1,2
1Department of Medical Biophysics, Western University, London, Ontario, Canada.
International Journal of Surgical Pathology
|November 20, 2024
Summary
Pathologists exhibit distinct visual search patterns when identifying rare elements in both general and specialized tasks. Their expertise allows for rapid, accurate classification, differing significantly from non-experts in domain-specific searches.
Area of Science:
- Ophthalmology and Visual Science
- Digital Pathology and Medical Imaging
- Cognitive Psychology and Human Factors
Background:
- Accurate identification of rare elements, such as mitotic figures, is critical in pathological diagnosis.
- Digital pathology combined with eye-tracking offers a novel method to analyze visual search strategies in pathology.
- Understanding these strategies can optimize diagnostic workflows and training.
Purpose of the Study:
- To investigate whether pathologists display unique visual search characteristics in domain-specific (pathology) versus non-domain-specific tasks.
- To compare the eye-tracking metrics of pathologists and non-pathologists during visual search.
- To assess the impact of task specificity on search efficiency and accuracy.
Main Methods:
- Six pathologists and six graduate students participated as observers.
- Participants completed both a non-domain-specific task (finding 'Waldo' in puzzles) and a domain-specific task (finding mitotic figures in digital pathology slides).
- Eye gaze data, including fixation duration and saccade rates, were collected and analyzed.
Main Results:
- Pathologists showed significantly shorter median fixation durations (244 ms) compared to non-pathologists (300 ms) in the non-domain task (P < .001).
- Pathologists' median fixation (3.17/sec) and saccade (2.77/sec) rates were significantly higher than non-pathologists (2.61/sec and 2.47/sec, respectively) in the non-domain task (P < .001).
- Pathologists' search characteristics differed significantly between domain-specific and non-domain-specific tasks, yet accuracy remained comparable across tasks and groups.
Conclusions:
- Pathologists possess specialized visual search strategies that enable rapid and accurate identification of targets, even rare ones, in domain-specific contexts.
- These findings highlight the efficiency of expert visual processing in pathology.
- The study demonstrates that expert pathologists can effectively differentiate and classify visual information, optimizing their search performance.
