Estimation of Subjectively Reported Trust, Mental Workload, and Situation Awareness Using Unobtrusive Measures

Author:

Kintz Jacob R.1ORCID,Banerjee Neil T.1ORCID,Zhang Johnny Y.1,Anderson Allison P.1ORCID,Clark Torin K.1ORCID

Affiliation:

1. Smead Department of Aerospace Engineering Sciences, University of Colorado–Boulder, Boulder, Colorado, USA

Abstract

Objective We use a set of unobtrusive measures to estimate subjectively reported trust, mental workload, and situation awareness (henceforth “TWSA”). Background Subjective questionnaires are commonly used to assess human cognitive states. However, they are obtrusive and usually impractical to administer during operations. Measures derived from actions operators take while working (which we call “embedded measures”) have been proposed as an unobtrusive way to obtain TWSA estimates. Embedded measures have not been systematically investigated for each of TWSA, which prevents their operational utility. Methods Fifteen participants completed twelve trials of spaceflight-relevant tasks while using a simulated autonomous system. Embedded measures of TWSA were obtained during each trial and participants completed TWSA questionnaires after each trial. Statistical models incorporating our embedded measures were fit with various formulations, interaction effects, and levels of personalization to understand their benefits and improve model accuracy. Results The stepwise algorithm for building statistical models usually included embedded measures, which frequently corresponded to an intuitive increase or decrease in reported TWSA. Embedded measures alone could not accurately capture an operator’s cognitive state, but combining the measures with readily observable task information or information about participants’ backgrounds enabled the models to achieve good descriptive fit and accurate prediction of TWSA. Conclusion Statistical models leveraging embedded measures of TWSA can be used to accurately estimate responses on subjective questionnaires that measure TWSA. Application Our systematic approach to investigating embedded measures and fitting models allows for cognitive state estimation without disrupting tasks when administering questionnaires would be impractical.

Funder

National Aeronautics and Space Administration

Publisher

SAGE Publications

Subject

Behavioral Neuroscience,Applied Psychology,Human Factors and Ergonomics

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