The vigilance decrement: its first 75 years.
Level 5 - mechanism / opinion, no new human data
Level 5 by design analogy for a narrative historical review without empirical data or systematic pooling.
PubMed 42339245 · doi:10.3389/fcogn.2025.1632885
What was done
This is a narrative historical review surveying approximately 75 years of research (from Mackworth's 1948 studies onward) on the vigilance decrement—the decline in target detection probability as time on task increases. The authors examine theoretical explanations for sustained attention failures, focusing particularly on signal detection theory frameworks that distinguish between reductions in perceptual sensitivity and conservative shifts in response criteria.
What was found
No quantitative data or pooled effect sizes are reported in the abstract. The authors note that early signal detection accounts attributed detection failures to conservative criterion shifts at slow event rates and sensitivity declines at fast event rates. However, recent work challenges the role of sensitivity loss due to characteristically low false-alarm rates across studies and the likelihood that observers disengage or cease attending to the signal source during prolonged vigils.
Why it matters
Understanding the mechanisms underlying sustained attention failures is critical for high-stakes domains such as radiology, air-traffic control, and driving safety. This historical synthesis clarifies whether mitigation strategies should target perceptual processing limits, decision thresholds, or attentional engagement.
Limits
As a narrative review, it lacks systematic search methodology, quantitative meta-analytic pooling, and quality appraisal of cited studies. The abstract provides no specific study count, sample sizes, or empirical data.
Cited by
- supports Healthy brains experience a measurable decline in vigilance and target detection ability when performing monotonous, prolonged tasks.