Spatial attention can bias search in visual short-term memory
DOI: 10.3389/neuro.09.004.2007
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Summary
This study investigates whether top-down spatial attention can bias the search process within visual short-term memory (VSTM), challenging the prevailing view that VSTM retrieval is automatic and serial. While attentional control is well-established in perceptual processing, its influence on mnemonic functions remains underexplored. The authors aimed to determine if orienting attention to a specific spatial location within a maintained memory array could facilitate the retrieval of a target item and to identify the underlying neural mechanisms using event-related potentials (ERPs). The experiment involved 24 participants who viewed arrays of one, two, or four colored items. After a retention interval, participants received either a spatial retro-cue indicating the location of the target item (100% valid) or a neutral cue providing no spatial information. They then performed a probe task, deciding whether a presented color had been in the original array. Behavioral performance and ERPs were recorded to assess accuracy, reaction times (RTs), and neural correlates of memory search. Behavioral results demonstrated that spatial retro-cues significantly improved both accuracy and response speed compared to neutral cues. Crucially, spatial cues attenuated the performance decrements typically associated with increasing memory load. In neutral conditions, RTs increased linearly with load, reflecting a serial search process. However, spatial cues reduced the slope of this RT/load relationship, indicating a more efficient search mechanism. ERP analysis identified a novel component, termed N3RS (Negative 300 Retroactive Search), characterized by frontal-central negativity peaking around 320 ms. The amplitude and duration of the N3RS increased monotonically with memory load in neutral trials, serving as a neural marker for serial search. In contrast, the N3RS component was absent in spatial cue trials, suggesting that attentional orienting bypassed the need for exhaustive search. The findings provide strong evidence that top-down attentional control extends to mnemonic functions, allowing for flexible, voluntary modulation of VSTM retrieval. By demonstrating that spatial attention can optimize the search path and eliminate the neural signature of serial search, the study challenges rigid models of VSTM that emphasize stability and automaticity. Instead, it supports a view of VSTM as a dynamic system where retrieval processes are subject to strategic attentional control, offering new insights into the neural mechanisms of memory access.
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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 | 2026-06-20 |
| chunk | success | chunk | — | — | 1 | 2026-06-20 |
| embed | success | embed | Qwen/Qwen3-Embedding-8B | — | 1 | 2026-06-20 |
| enrich | success | openalex | — | — | 1 | 2026-06-20 |
| promote | success | — | — | — | 1 | 2026-06-17 |
| summarize | success | llm | qwen3.6-27b-prismaquant | summ-v5 | 1 | 2026-06-25 |
| tag | success | vector_similarity | — | — | 6 | 2026-06-20 |
| verify | success | — | — | — | 1 | 2026-06-26 |
Summary generated by qwen3.6-27b-prismaquant on 2026-06-25; verification: verified.
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