Overt and Covert Effects of Mental Fatigue on Attention Networks: Evidence from Event-Related Potentials during the Attention Network Test
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Summary
This study investigates the impact of mental fatigue on the three attentional networks defined by the Posnerian model: alerting, orienting, and executive (conflict). While mental fatigue is known to impair cognitive control, previous research often conflated fatigue with time-on-task effects, such as learning or motivation changes. To isolate the specific effects of fatigue, the authors aimed to distinguish between overt behavioral performance and covert neural processing using event-related potentials (ERPs). The researchers hypothesized that mental fatigue would primarily impair the executive network, which relies on top-down control, while sparing alerting and orienting networks. The experiment involved thirty healthy subjects divided into a fatigue group and a control group. The fatigue group performed a continuous arithmetic task for one hour to induce mental exhaustion, while the control group engaged in leisure activities. Electroencephalography (EEG) recordings were conducted before and after this interval while participants performed the Attention Network Test (ANT). The ANT measures network efficiency through reaction times and accuracy across various cue and target conditions. ERP analysis focused on specific components: N1 and P3 for alerting and orienting networks, and N2 and P3 for the executive network, particularly during incongruent trials requiring conflict resolution. Behavioral results indicated that the overt efficiency of the three attentional networks remained comparable between the fatigue and control groups. Reaction times shortened only in the control group, and accuracy declines related to alerting and conflict networks occurred only after mental effort. However, ERP data revealed significant covert deficits in the fatigue group. Mental fatigue reduced the amplitude of the N1 component during alerting network engagement and the P3 amplitude during orienting. Crucially, fatigue significantly reduced N2 and P3 amplitudes during conflict processing, specifically affecting the response to incongruent targets. These findings demonstrate that mental fatigue exerts detrimental effects on top-down attentional mechanisms even when overt behavioral performance is maintained. The preservation of reaction times and accuracy suggests that healthy young subjects employ compensatory mechanisms to sustain performance despite neural resource depletion. The study highlights the importance of using psychophysiological measures like ERPs to detect subtle cognitive impairments that behavioral metrics alone may miss, providing evidence that fatigue specifically undermines the neural resources required for conflict resolution and selective attention.
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| Stage | Outcome | Tool | Model | Prompt | Attempts | Completed |
|---|---|---|---|---|---|---|
| discover | success | Crossref | — | — | 1 | 2026-06-18 |
| archive | success | openalex | — | — | 5 | 2026-06-25 |
| extract | success | cached | — | — | 2 | 2026-06-26 |
| clean | success | clean | — | — | 1 | 2026-06-18 |
| chunk | success | chunk | — | — | 1 | 2026-06-18 |
| embed | success | embed | Qwen/Qwen3-Embedding-8B | — | 1 | 2026-06-18 |
| promote | success | — | — | — | 1 | 2026-06-18 |
| summarize | success | llm | qwen3.6-27b-prismaquant | summ-v5 | 1 | 2026-06-26 |
| tag | success | vector_similarity | — | — | 6 | 2026-06-18 |
| verify | success | — | — | — | 1 | 2026-06-26 |
Summary generated by qwen3.6-27b-prismaquant on 2026-06-26; verification: verified.
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- Empirical Findings: physiological data