Distinct neural markers for intentional and unintentional task unrelated thought
DOI: 10.1101/705061
archive: archived pipeline: cataloged verified
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Summary
This study investigates the neural correlates of task-unrelated thought (TUT), specifically distinguishing between deliberate (intentional) and spontaneous (unintentional) mind-wandering. Contemporary theories propose that off-task states arise from distinct component processes, such as perceptual decoupling and executive control. The authors aimed to identify common and distinct electrophysiological markers for these two types of TUT using electroencephalography (EEG). The experiment involved 26 participants performing a fixed Sustained Attention to Response Task (SART), designed to induce monotony and attentional lapses. Attentional states were monitored using both probe-caught (PC) and self-caught (SC) thought sampling methods. Participants categorized their thoughts as on-task, task-related, distracted, deliberate TUT (future plans/past memories), or spontaneous TUT (daydreaming). EEG data were analyzed for event-related potentials (ERPs) and time-frequency oscillatory activity in the trials preceding thought reports. The analysis compared on-task versus off-task states (PC condition) and deliberate versus spontaneous TUT (SC condition). The results revealed that both deliberate and spontaneous TUT shared a common neural signature: a significant attenuation of the P3 ERP component, indicating reduced attentional resource allocation to external stimuli regardless of intentionality. However, distinct markers differentiated the two types of off-task thought. Deliberate TUT was associated with increased alpha power and enhanced cortical phase-locking (inter-trial phase coherence), suggesting active executive control and inhibition of sensory input. In contrast, spontaneous TUT was characterized by reductions in evoked sensory responses, consistent with passive perceptual decoupling. These findings support the component-process account of ongoing thought, demonstrating that while all mind-wandering involves disengagement from external tasks, the underlying neural mechanisms vary based on whether the shift in attention is intentional or spontaneous.
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| Stage | Outcome | Tool | Model | Prompt | Attempts | Completed |
|---|---|---|---|---|---|---|
| discover | success | Crossref | — | — | 1 | 2026-08-09 |
| archive | success | canonical_url | — | — | 1 | 2026-08-09 |
| extract | success | cached | — | — | 3 | 2026-08-10 |
| clean | success | clean | — | — | 1 | 2026-08-09 |
| chunk | success | chunk | — | — | 1 | 2026-08-09 |
| embed | success | embed | Qwen/Qwen3-Embedding-8B | — | 1 | 2026-08-09 |
| promote | success | — | — | — | 1 | 2026-08-09 |
| summarize | success | llm | qwen3.6-27b-nvidia | summ-v5 | 2 | 2026-08-10 |
| tag | success | vector_similarity | — | — | 11 | 2026-08-11 |
| verify | success | — | — | — | 2 | 2026-08-10 |
Summary generated by qwen3.6-27b-nvidia on 2026-08-10; verification: verified.
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