Measuring mental workload during the performance of advanced laparoscopic tasks

Area of Science:

• Surgical Education
• Cognitive Psychology
• Human Factors Engineering

Background:

• Mental workload is a critical factor in learning and performing complex tasks.
• Measuring a surgeon's mental workload can indicate their level of expertise.
• This study investigated the relationship between surgical skill and cognitive resource allocation.

Purpose of the Study:

• To test the hypothesis that expert laparoscopic surgeons have more spare mental resources than novices.
• To evaluate the utility of a secondary task for assessing mental workload in surgeons.
• To determine if mental workload is an indirect measure of surgical expertise.

Main Methods:

• Novice and expert surgeons performed standardized laparoscopic suturing tasks for 6 minutes.
• Participants simultaneously completed a visual detection task, identifying true signals among false ones.
• Suturing performance was assessed using the Fundamentals of Laparoscopic Surgery (FLS) scoring system.
• The visual detection task performance was measured by the rate of missed or falsely detected signals.

Main Results:

• Experts completed significantly more secure sutures (6 +/- 2) than novices (3 +/- 1; p = 0.001).
• Expert suture performance scores (50 +/- 20) were significantly higher than novices (29 +/- 10; p = 0.005).
• Experts demonstrated a higher visual signal detection rate (98%) compared to novices (93%; p = 0.041).

Conclusions:

• Surgical practice leads to automaticity, reducing mental workload and freeing cognitive resources for secondary tasks.
• Visual detection serves as a simple, reliable method for assessing surgeons' mental workload and situation awareness.
• This approach offers a potential indirect measure of surgical expertise during training.