Abstract
Our objective was to apply ideas from complexity theory to derive neurophysiologic models of Submarine Piloting and Navigation showing how teams cognitively organize around changes in the task and how this organization is altered with experience. The cognitive metric highlighted was an electroencephalography (EEG)-derived measure of engagement (termed NS_E) which was modeled into a collective team variable showing the engagement of each of 6 team members as well as the engagement of the team as a whole. We show that during a navigation task the NS_E data stream contains historical information about the cognitive organization of the team and that this organization can be quantified by fluctuations in the Shannon entropy of the data stream.
The fluctuations in the NS_E entropy were complex, showing both rapid changes over a period of seconds and longer fluctuations that occurred over periods of minutes. The periods of low NS_E entropy represented moments when the team’s cognition had undergone significant re-organization, i.e. when fewer NS_E symbols were being expressed.
Decreases in NS_E entropy were associated with periods of poorer team performance as indicated by delays/omissions in the regular determination of the submarine’s position; parallel communication data suggested that these were also periods of increased stress.
Experienced submarine navigation teams performed better than Junior Officer teams, had higher overall levels of NS_E entropy and appeared more cognitively flexible as indicated by the use of a larger repertoire of available NS_E patterns.
The quantitative information in the NS_E entropy may provide a framework for designing future adaptive team training systems as it can be modeled and reported in near real time.
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Alternative numbering schemes such as assigning values of 3, 2 and 1 to the partitions designated as upper, middle or lower third were also tested. These resulted in an R 2 of >0.95 when the entropy of the NS_E data stream was compared with that generated from models where the vectors were assigned values of 3, 1 and −1. The resulting histogram displays were more difficult to understand and so the 3, 1 and −1 convention was retained.
Preliminary models were created with 400, 100, 25 and 16 nodes and 25 nodes provided the best balance between sensitivity and speed.
Across the 6 members of one team the median decontamination period was 840 milliseconds and within this window the first 160 ms and the last 320 ms were reference segments used for interpolation. The decontamination algorithm then examines each remaining data points (∼360 ms) and if 2 SD above the mean reference segment then they were interpolated. This resulted in ∼25 % of the segments being interpolated or ∼90 ms per second, or 45 ms/eye blink
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Acknowledgements
We extend a special thanks to Adrienne Behneman for the data collection and to Drs. Jamie Gorman and Polemnia Amazeen for helpful discussions.
Approved for Public Release, Distribution Unlimited. “The views expressed are those of the author and do not reflect the official policy or position of the Department of Defense or the U.S. Government.” This is in accordance with DoDI 5230.29, January 8, 2009. This work was supported by NSF SBIR awards 1215327, 0822020, Office of Naval Research award N00014-11-M-0129, and an award from the Defense Advanced Research Projects Agency (DARPA) under contract numbers NBCHC070101, NBCHC090054 and W31P4Q12C0166.
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Stevens, R., Galloway, T., Wang, P. et al. Modeling the neurodynamic complexity of submarine navigation teams. Comput Math Organ Theory 19, 346–369 (2013). https://doi.org/10.1007/s10588-012-9135-9
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DOI: https://doi.org/10.1007/s10588-012-9135-9