Always returning: feedback and sensory processing in visual cortex and thalamus.
Open accessAbstract
Feedback projections are an integral part of the mammalian visual system. Although it is tempting to relegate them to a subsidiary role in visual processing, because their supposed latency and lag might appear to be unfavourable for an involvement in fast processing, this is a dangerous simplification. Certainly for the world in motion, feedback from higher motion areas can influence the transfer of ascending input when, or even before, the input arrives. Here, we consider the circuit formed by layer 6 feedback cells in the visual cortex and how this straddles the retinothalamic and thalamocortical transfer of visual input. We discuss its links to feedback from the cortical motion area MT (V5), and suggest that motion perception involves a dynamic interplay between MT, V1 and the thalamus. This review is part of the TINS special issue on The Neural Substrates of Cognition.
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These feedback connections target the distal dendrites of relay cells and also contact inhibitory interneurons.
“These feedback connections target the distal dendrites of relay cells and also contact inhibitory interneurons.”
From Towards a mathematical theory of cortical micro-circuits (2009) · cites this paper as [58]
Cells in layer 6 of V1 provide extensive feedback connections to the LGN of the thalamus.
“According to these studies, cells in layer 6 of V1 provide extensive feedback connections to the LGN of the thalamus.”
From Towards a mathematical theory of cortical micro-circuits (2009) · cites this paper as [58]
Some layer 6 cortical circuits already identified by other neuroscientists as possible candidates for the gating of feedforward activation (control of attention) are compatible with our model.
“However, it is worth mentioning that some of the layer 6 cortical circuits already identified by other neuroscientists as possible candidates for the gating of feedforward activation (control of attention) [56]–[59] are compatible with our model.”
From Towards a mathematical theory of cortical micro-circuits (2009) · cites this paper as [58]
The same layer 6 cells also send collateral axons to layer 4 where LGN afferents contact the cortex.
“The same layer 6 cells also send collateral axons to layer 4 where LGN afferents contact the cortex.”
From Towards a mathematical theory of cortical micro-circuits (2009) · cites this paper as [58]
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- Authors
- Sillito, A. M., Cudeiro, J., & Jones, H. E.
- Affiliations
- University College London (GB)
- Universidade da Coruña (ES)
- Corresponding author
- Sillito, Adam M.
- Venue
- Trends in Neurosciences
- Publisher
- Elsevier BV
- Published
- 2006-06
- Volume
- 29
- Issue
- 6
- Pages
- 307-316
- ISSN
- 0166-2236 (ISSN-L)
- OpenAlex
- W1975867390
- Cited by
- 242
- References
- 78
- Citations by year
- 2026: 4 · 2025: 7 · 2024: 5 · 2023: 1 · 2022: 11 · 2021: 7 · 2020: 11 · 2019: 11 · 2018: 18 · 2017: 9 · 2016: 15 · 2015: 15 · 2014: 16 · 2013: 12 · 2012: 24
- FWCI
- 1.12
- Type
- journal article
- Language
- en
- Open access
- green
- hdl.handle.net
- Licence
- cc-by-nc-nd
- www.elsevier.com/tdm/userlicense/1.0/ (tdm)
- Locations
- Trends in Neurosciences (publishedVersion)
- PubMed (publishedVersion)
- LA Referencia (Red Federada de Repositorios Institucionales de Publicaciones Científicas) (submittedVersion, cc-by-nc-nd)
- UCL Discovery (University College London) (submittedVersion)
- RUC (Universidade Da Coruña) (submittedVersion, cc-by-nc-nd)
- Topics
- Life Sciences › Neuroscience › Cognitive Neuroscience › Visual perception and processing mechanisms
- Social Sciences › Psychology › Experimental and Cognitive Psychology › Multisensory perception and integration
- Life Sciences › Neuroscience › Cognitive Neuroscience › Neural dynamics and brain function
- Keywords
- feedback projections, visual cortex, thalamus, thalamocortical circuits, MT/V5, motion perception, sensory processing
- MeSH terms
- Animals, Feedback, Humans, Models, Neurological, Sensation, Thalamus, Visual Cortex, Visual Pathways
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