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Modulation of connectivity in visual pathways by attention: cortical interactions evaluated with structural equation
1The Wellcome Department of Cognitive Neurology, Institute of Neurology, London, UK. cbuechel@fil.ion.ucl.ac.uk
Cerebral Cortex (New York, N.Y. : 1991)
|January 4, 1998
Summary
Attention to visual motion enhances brain connectivity between visual motion area V5 and posterior parietal cortex. This modulation is driven by the prefrontal cortex, highlighting its role in directing visual attention.
Area of Science:
- Neuroscience
- Cognitive Neuroscience
- Neuroimaging
Background:
- Attention modulates neural activity in visual processing areas.
- Changes in brain connectivity are proposed mechanisms for attentional modulation.
- Previous studies indicate increased responsiveness in visual motion area V5 and posterior parietal cortex (PP) with attention.
Purpose of the Study:
- To investigate attentional modulation of effective connectivity in the visual brain.
- To determine the neural network involved in attention to visual motion.
- To identify the brain regions responsible for modulating visual pathway connectivity.
Main Methods:
- Functional magnetic resonance imaging (fMRI) was used to measure brain activity.
- Structural equation modeling (SEM) analyzed effective connectivity between brain regions.
- Visual motion stimuli were presented while participants' attention varied.
Main Results:
- Attention to visual motion increased connectivity between visual motion area V5 and posterior parietal cortex (PP).
- An occipito-parieto-frontal network, including V1, V5, and PP, showed modulated haemodynamic responses.
- The prefrontal cortex (PFC) was identified as a modulator of the V5-PP pathway.
Conclusions:
- Attention dynamically alters effective connectivity within the dorsal visual pathway.
- The prefrontal cortex plays a crucial role in top-down attentional modulation of visual processing.
- Findings support the role of changing neural pathway interactions in attention.