Structural learning theory suggests that experiencing motor task variation enables the central nervous system to extract general rules regarding tasks with a similar structure—rules that can subsequently be applied to novel situations. Complex minimally invasive surgery (MIS) requires different port sites, but switching ports alters the limb movements required to produce the same endpoint control of the surgical instrument. The purpose of the present study was to determine if structural learning theory can be applied to MIS to inform training methods.
A tablet laptop running bespoke software was placed within a laparoscopic box trainer and connected to a monitor situated at eye level. Participants (right-handed, non-surgeons, mean age = 23.2 years) used a standard laparoscopic grasper to move between locations on the screen. There were two training groups: the M group (n = 10) who trained using multiple port sites, and the S group (n = 10) who trained using a single port site. A novel port site was used as a test of generalization. Performance metrics were a composite of speed and accuracy (SACF) and normalized jerk (NJ; a measure of movement ‘smoothness’).
The M group showed a statistically significant performance advantage over the S group at test, as indexed by improved SACF (p < 0.05) and NJ (p < 0.05).
This study has demonstrated the potential benefits of incorporating a structural learning approach within MIS training. This may have practical applications when training junior surgeons and developing surgical simulation devices.
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This work was kindly supported by the Wellcome Trust, Engineering and Physical Sciences Research Council (EPSRC), and the Leeds Teaching Hospitals Charitable Trust. The authors would like to thank Faisal Mushtaq for his contributions in proofreading the manuscript.
Alan D. White, Oscar Giles, Rebekah Sutherland, Oliver Ziff, Mark Mon-Williams, Richard M. Wilkie and J. Peter A. Lodge have no conflicts of interest to declare.
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White, A.D., Giles, O., Sutherland, R.J. et al. Minimally invasive surgery training using multiple port sites to improve performance. Surg Endosc 28, 1188–1193 (2014). https://doi.org/10.1007/s00464-013-3307-7
- Minimally invasive surgery
- Motor control
- Motor learning