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Visual attention and cognitive workload using different laparoscopic box trainers and mixed-reality feedback
Aseel F Khanfar1,2, Sanaz Motamedi1, Shawn D Safford3
1Department of Industrial Engineering, The Pennsylvania State University, University Park, PA, USA.
Background:
Laparoscopic techniques have revolutionized minimally invasive surgery (MIS) but remain visually and mentally demanding, especially in smaller operative sites (e.g., pediatric patients). Though traditional box trainers serve as the golden standard for laparoscopic simulation-based training (SBT), they are limited due to their lack of real-time feedback and objective assessments. Advancements in SBT using Visual Reality (VR) and Augmented/Mixed-Reality (AR/MR) can provide objective real-time evaluations. This study assessed the effects of mixed-reality feedback on trainees' visual attention and mental workload during adult and pediatric laparoscopic SBT.
Methods:
Expert (n = 4) and novice surgeons (n = 24) were recruited to investigate the effects of various laparoscopic box trainers (e.g., adult and pediatric patients), as well as different feedback conditions in a MR setting, on trainees' visual attention and perceived mental workload. Peg transfer task was chosen to evaluate novices' ambidexterity and eye-hand coordination. Eye-tracking metrics (fixations, fixation durations, saccades, and saccade durations) and mental workload indicators (pupil diameter and NASA-TLX scores) were collected. K-means clustering was used to classify novices into proficiency groups based on these metrics.
Results:
Eye-tracking and mental workload metrics successfully differentiated two novice proficiency groups, significantly different from expert performance. Analysis revealed two key findings: novices demonstrated shorter fixation durations when using the pediatric trainer when compared to the adult trainer, and pupil diameter was lower for participants who started their trials with pediatric trainers (p = 0.016). However, the presence or absence of mixed-reality feedback did not significantly affect visual attention patterns or mental workload measures.
Conclusions:
Visual attention and mental workload metrics in mixed-reality environments effectively differentiated novice proficiency levels in laparoscopic box trainers. Our findings validate eye-tracking metrics for objective skill assessment in both adult and pediatric trainers, highlighting their potential for adaptive training programs and competency evaluation in surgical education.
