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- Title
Gamma Power as an Index of Sustained Attention in Simulated Vigilance Tasks.
- Authors
Curley, Taylor M.; Borghetti, Lorraine; Morris, Megan B.
- Abstract
Performance on the psychomotor vigilance test (PVT; Dinges & Powell, 1985)—a common index of sustained attention—is affected by the opposing forces of fatigue and sustained effort, where reaction times and error rates typically increase across trials and are sometimes offset by additional efforts deployed toward the end of the task (i.e., an "end‐spurt"; cf. Bergum & Klein, 1961). In ACT‐R (Adaptive Control of Thought‐Rational; Anderson et al., 2004), these influences on task performance have been modeled as latent variables that are inferred from performance (e.g., Jongman, 1998; Veksler & Gunzelmann, 2018) without connections to directly observable variables. We propose the use of frontal gamma (γ) spectral power as a direct measure of vigilant effort and demonstrate its efficacy in modeling performance on the PVT in both the aggregate and in individuals. Performance decrements across time‐on‐task during sustained attention tasks are difficult to simulate in computational frameworks, as are the relationships between behavioral and neural outcomes related to fatigue. We propose the use of frontal gamma spectral power computed from EEG data as a direct measure of both positive (i.e., compensatory) and negative (i.e., fatigue‐related) changes in vigilant attention and introduce a method for incorporating these estimates into ACT‐R models of the psychomotor vigilance test (PVT). Simulations using gamma power successfully recover observed response patterns in both the aggregate and within individual participants.
- Subjects
MOTOR ability testing; ADAPTIVE control systems; LATENT variables; TASK performance; ERROR rates
- Publication
Topics in Cognitive Science, 2024, Vol 16, Issue 1, p113
- ISSN
1756-8757
- Publication type
Article
- DOI
10.1111/tops.12700