Modulation of connectivity in visual pathways by attention: cortical interactions evaluated with structural equation modelling and fMRI

Clicks: 1
ID: 303746
1997
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Ranked #102 of 107 articles by views in cerebral cortex (new york, ny : 1991)

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Abstract
Electrophysiological and neuroimaging studies have shown that attention to visual motion can increase the responsiveness of the motion-selective cortical area V5 and the posterior parietal cortex (PP). Increased or decreased activation in a cortical area is often attributed to attentional modulation of the cortical projections to that area. This leads to the notion that attention is associated with changes in connectivity. We have addressed attentional modulation of effective connectivity using functional magnetic resonance imaging (fMRI). Three subjects were scanned under identical stimulus conditions (visual motion) while varying only the attentional component of the task. Haemodynamic responses defined an occipito-parieto-frontal network, including the, primary visual cortex (V1), V5 and PR A structural equation model of the interactions among these dorsal visual pathway areas revealed increased connectivity between V5 and PP related to attention. On the basis of our analysis and the neuroanatomical pattern of projections from the prefrontal cortex to PP we attributed the source of modulatory influences, on the posterior visual pathway, to the prefrontal cortex (PFC). To test this hypothesis we included the PFC in our model as a 'modulator' of the pathway between V5 and PP, using interaction terms in the structural equation model. This analysis revealed a significant modulatory effect of prefrontal regions on V5 afferents to posterior parietal cortex.
Reference Key
openalex_W2043749411 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Christian Büchel
Journal cerebral cortex (new york, ny : 1991)
Year 1997
DOI
10.1093/cercor/7.8.768
URL
https://academic.oup.com/cercor/article-pdf/7/8/768/9752615/070768.pdf
Keywords Keywords not found

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