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Cited by 296Visual perception and processing mechanismsVisual Attention and Saliency DetectionReading and Literacy Development

The DOI matches its Crossref record; 111 of the 111 references it cites were found in a registry or an index.

A neuronal model of attentional spotlight: parietal guiding the temporal

Vidyasagar, Trichur Raman·1999·Brain Research Reviews
DOI 10.1016/s0165-0173(99)00005-3
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Abstract

Recent studies have reported an attentional feedback that highlights neural responses as early along the visual pathway as the primary visual cortex. Such filtering would help in reducing informational overload and in performing serial visual search by directing attention to individual locations in the visual field. The magnocellular (M) and parvocellular (P) subdivisions are two of the major parallel pathways in primate vision that originate in the retina and carry distinctly different types of information. The M pathway, characterized by its high sensitivity to movement and to low contrast stimuli, forms the predominant visual input into the dorsal, parietal stream in the neocortex. The P inputs, characterized by their colour selectivity and higher spatial resolution, are channeled mainly into the ventral, temporal stream. It is proposed that the attentional spotlight originates in the dorsal stream and helps in serially searching the field for conjunction of the relevant target features in the temporal stream, effectively performing a gating function on all visual inputs. This model predicts that a defect limited to the magnocellular or the dorsal pathway can lead to widespread deficits in cognitive abilities, including those functions that are largely based on parvocellular information. For example, the model provides a neural mechanism linking a peripheral defect in the magnocellular pathway to the reading disabilities in dyslexia. Even though there has been strong evidence for a magnocellular deficit in dyslexia, the paradox has been that the cognitive disability seems to be related to P pathway function. The scheme proposed here shows how M input may be vital for controlling sequential attention during reading.

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Research works printed but not linked: 5

  1. R. Desimone, L.G. Ungerleider, Neural mechanisms of visual processing in monkeys, in: F. Boller, J. Grafman (Eds.), Neuropsychology, Vol. 2, Elsevier, New York, 1989, pp. 267–299.
  2. K.H. Ruddock, Visual search in dyslexia, in: J.F. Cronly-Dillon, J.F. Stein (Eds.), Vision and Visual Dyslexia, Vol. 13, 1991, pp. 58–83.
  3. L.G. Ungerleider, M. Mishkin, Two cortical visual systems, in: D.J. Ingle, R.J.W. Mansfield, M.S. Goodale (Eds.), The Analysis of Visual Behaviour, MIT Press, Cambridge, MA, 1982, pp. 549–586.
  4. Vidyasagar, 1998, Relationship between chromatic and luminance sensitivities in macaque primary visual cortex: evidence for convergence of different information channels, Proc. Aust. Neurosci. Soc., 9, 26
  5. S. Zeki, A Vision of the Brain, Blackwell Scientific, Oxford, 1993.

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Metadata

Authors
Vidyasagar, T. R.
Affiliations
Australian National University (AU)
Corresponding author
Vidyasagar, Trichur Raman
ORCID
Vidyasagar, Trichur Raman
Venue
Brain Research Reviews
Publisher
Elsevier BV
Published
1999-07
Volume
30
Issue
1
Pages
66-76
ISSN
0165-0173 (ISSN-L)
DOI
10.1016/s0165-0173(99)00005-3
OpenAlex
W2138714875
Cited by
296
References
111
Citations by year
2026: 2 · 2025: 4 · 2024: 5 · 2023: 3 · 2022: 7 · 2021: 9 · 2020: 8 · 2019: 11 · 2018: 6 · 2017: 10 · 2016: 6 · 2015: 5 · 2014: 10 · 2013: 13 · 2012: 18
FWCI
1.13
Type
journal article
Language
en
Open access
closed
Licence
www.elsevier.com/tdm/userlicense/1.0/ (tdm)
Locations
  • Brain Research Reviews (publishedVersion)
  • PubMed (publishedVersion)
  • ANU Open Research (Australian National University) (submittedVersion)
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Visual perception and processing mechanisms
  • Physical Sciences › Computer Science › Computer Vision and Pattern Recognition › Visual Attention and Saliency Detection
  • Social Sciences › Psychology › Developmental and Educational Psychology › Reading and Literacy Development
Keywords
attentional spotlight, magnocellular pathway, parvocellular pathway, dorsal stream, ventral stream, visual pathway, dyslexia, reading, attentional gating, parallel visual pathways
MeSH terms
Animals, Attention, Feedback, Humans, Models, Neurological, Neurons, Parietal Lobe, Temporal Lobe, Vision, Ocular, Visual Pathways

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