A lateralized brain network for visuospatial attention
DOI: 10.1038/nn.2905
archive: archived pipeline: cataloged verified
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Summary
This study investigates the anatomical basis of right hemisphere dominance for visuospatial attention, a phenomenon well-documented in behavioral studies but lacking structural evidence in humans. While clinical data suggest that visuospatial attention is primarily a right-hemisphere function, the specific neural pathways responsible for this lateralization had not been previously identified. The authors aimed to determine if asymmetries in parieto-frontal connectivity correlate with behavioral biases in attention. The researchers utilized diffusion imaging tractography based on spherical deconvolution to perform virtual in vivo dissections of parieto-frontal connections in 20 right-handed subjects. They focused on the superior longitudinal fasciculus (SLF), which consists of three longitudinal tracts: SLF I (dorsal), SLF II (middle), and SLF III (ventral). To assess behavioral correlates, participants completed a line bisection test to measure spatial bias and a modified Posner paradigm to measure detection speeds in left versus right visual hemi-fields. The results revealed a distinct dorsal-to-ventral gradient in the lateralization of the SLF. SLF I was symmetrically distributed, while SLF III was significantly right-lateralized. Crucially, SLF II showed a trend toward right lateralization, and its volume asymmetry strongly correlated with behavioral performance. Specifically, larger right-hemisphere SLF II volumes corresponded to a greater leftward deviation in the line bisection test (the "pseudoneglect effect") and faster detection times for targets in the left visual hemi-field. Subjects who deviated to the right exhibited the opposite anatomical pattern, with larger left SLF II volumes. No significant correlations were found for SLF I or SLF III. The authors conclude that the SLF II serves as a direct communication pathway between the dorsal (voluntary orienting) and ventral (automatic capture) attention networks. The observed right-hemisphere dominance in SLF II volume likely facilitates faster visuospatial processing in the left visual field, explaining the behavioral bias. This study provides the first evidence linking anatomical asymmetry of parieto-frontal connections to behavioral specialization in visuospatial attention. These findings offer a neuroanatomical framework for understanding attention models and may help predict recovery outcomes in patients with lesions affecting these networks.
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| Stage | Outcome | Tool | Model | Prompt | Attempts | Completed |
|---|---|---|---|---|---|---|
| discover | success | OpenAlex-citations | — | — | 1 | 2026-06-19 |
| archive | success | unpaywall | — | — | 2 | 2026-06-26 |
| extract | success | pdftotext | — | — | 2 | 2026-06-26 |
| clean | success | clean | — | — | 1 | 2026-06-26 |
| chunk | success | chunk | — | — | 1 | 2026-06-26 |
| embed | success | embed | Qwen/Qwen3-Embedding-8B | — | 1 | 2026-06-26 |
| enrich | failed | — | — | — | 4 | 2026-06-26 |
| promote | success | — | — | — | 1 | 2026-06-19 |
| summarize | success | llm | qwen3.6-27b-prismaquant | summ-v5 | 1 | 2026-06-26 |
| tag | success | vector_similarity | — | — | 6 | 2026-06-26 |
| verify | success | — | — | — | 1 | 2026-06-26 |
Summary generated by qwen3.6-27b-prismaquant on 2026-06-26; verification: verified.
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