ArticleFrontiers in cellular neuroscience2023
Visual cortical LFP in relation to the hippocampal theta rhythm in track running rats.
Article in Frontiers in cellular neuroscience, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.
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4 citing papers in PubMed, 8 citations in OpenAlex.
- Enriched experience increases reciprocal synaptic connectivity and coding sparsity in higher-order cortex.Science advances · 2026Article
- Enriched experience increases reciprocal synaptic connectivity and coding sparsity in higher-order cortex.bioRxiv : the preprint server for biology · 2025Article
- Cortex-wide spatiotemporal motifs of theta oscillations are coupled to freely moving behavior.Frontiers in systems neuroscience · 2025Article
- Hippocampal and cortical activities reflect early hyperexcitability in an Alzheimer's mouse model.Brain communications · 2025Article
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8 authors at 2 institutions in 1 country.
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Abstract
Theta oscillations in the primary visual cortex (VC) have been observed during running tasks, but the mechanism behind their generation is not well understood. Some studies have suggested that theta in the VC is locally generated, while others have proposed that it is volume conducted from the hippocampus. The present study aimed to investigate the relationship between hippocampal and VC LFP dynamics. Analysis of power spectral density revealed that LFP in the VC was similar to that in the hippocampus, but with lower overall magnitude. As running velocity increased, both the power and frequency of theta and its harmonics increased in the VC, similarly to what is observed in the hippocampus. Current source density analysis triggered to theta did not identify distinct current sources and sinks in the VC, supporting the idea that theta in the VC is conducted from the adjacent hippocampus. Phase coupling between theta, its harmonics, and gamma is a notable feature in the hippocampus, particularly in the lacunosum moleculare. While some evidence of coupling between theta and its harmonics in the VC was found, bicoherence estimates did not reveal significant phase coupling between theta and gamma. Similar results were seen in the cross-region bicoherence analysis, where theta showed strong coupling with its harmonics with increasing velocity. Thus, theta oscillations observed in the VC during running tasks are likely due to volume conduction from the hippocampus.
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