Self-assessment - a useful contribution to our understanding of pilot fatigue?
Keywords:
Pilots, fatigue, accounts, post-hoc, significance.Abstract
Sleep science predicts a link between time awake and physical and psychological impairment. Responding to an on-line questionnaire pilots described their physical and psychological state after various periods of wakefulness. A syntax analysis (Gee, 2005) revealed a positive correlation between time awake and perceived symptoms of fatigue. Such data is usually garnered from instantaneous self-assessments (ISAs). These findings were derived from post-hoc accounts. Given the consistency of the findings with those based on ISAs it would seem that post-hoc accounts are not unreliable. There are questions over the accuracy of ISAs (Caldwell et al., 2009; Baron, 2009; Eurocontrol, 2012). Post-hoc accounts may be subject to anchoring. Tversky and Kahneman's (1974) work on heuristics and Kasperson and Kasperson's (1996) work on risk amplification is relevant to questions of distortion. The methodology of the ISA and post-hoc account requires further validation.
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