A dual mechanism underlying retroactive shifts of auditory spatial attention: dissociating target- and distractor-related modulations of alpha lateralization
DOI: 10.1038/s41598-020-70004-2
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Summary
This study investigates the neural mechanisms underlying retroactive shifts of attention within auditory working memory, specifically addressing whether such shifts involve the prioritization of relevant information, the inhibition of irrelevant information, or both. While previous research linked attentional selection to alpha-band oscillations, it remained ambiguous whether lateralized alpha power changes reflected the facilitation of targets or the suppression of distractors, largely due to experimental designs where both targets and distractors were lateralized. To dissociate these mechanisms, the authors employed an auditory retroactive cueing task where participants maintained two sounds (one lateral, one central) in working memory. A retro-cue then indicated which item(s) remained relevant for a subsequent comparison with a probe stimulus. This design ensured that only either the target or the distractor was lateralized, allowing hemispheric asymmetries in alpha power to be unambiguously attributed to the processing of the specific lateralized item. Behavioral results demonstrated a significant retro-cue benefit, with participants responding significantly faster when only one item remained relevant compared to when both remained relevant, though accuracy did not differ. Crucially, performance on trials probing the non-cued (irrelevant) item was slower and less accurate than trials probing a new item, suggesting that non-cued information was removed from the focus of attention but remained in a residual, "activity-silent" state that caused proactive interference. Electroencephalography (EEG) analysis revealed distinct patterns of alpha lateralization depending on the spatial arrangement of the relevant item. In trials where the lateral item was the target, there was a contralateral decrease in alpha power, consistent with target prioritization and increased neural excitability. Conversely, in trials where the lateral item was the distractor (and the central item was the target), there was a contralateral increase in alpha power, indicating the functional inhibition of the irrelevant lateral location. No lateralization occurred when both items remained relevant, confirming that alpha lateralization is specific to situations requiring spatial re-orienting. The findings provide evidence for a dual mechanism underlying retroactive attentional deployment: excitatory processes that prioritize relevant information and inhibitory processes that suppress irrelevant information. By dissociating target- and distractor-related modulations, the study clarifies that alpha lateralization reflects both the strengthening of attended representations and the gating of unattended ones. These results support the gating-by-inhibition framework and align with theories of activity-silent working memory, suggesting that while non-cued items are inhibited from active maintenance, they are not irreversibly lost. This work contributes to the broader understanding of how selective attention operates on mnemonic contents, demonstrating that auditory spatial attention shares similar neural signatures with visual attention and relies on complementary excitatory and inhibitory control mechanisms to efficiently allocate limited mental resources.
Provenance
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| Stage | Outcome | Tool | Model | Prompt | Attempts | Completed |
|---|---|---|---|---|---|---|
| discover | success | Crossref | — | — | 1 | 2026-06-17 |
| archive | success | canonical_url | — | — | 1 | 2026-06-25 |
| extract | success | cached | — | — | 2 | 2026-06-25 |
| 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 | 2026-06-17 |
| summarize | success | llm | qwen3.6-27b-prismaquant | summ-v5 | 1 | 2026-06-25 |
| tag | success | vector_similarity | — | — | 6 | 2026-06-18 |
| verify | success | — | — | — | 1 | 2026-06-26 |
Summary generated by qwen3.6-27b-prismaquant on 2026-06-25; verification: verified.
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