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Interaction between bottom-up saliency and top-down control: how saliency maps are created in the human brain
Lucia Melloni1, Sara van Leeuwen, Arjen Alink
1Department of Neurophysiology, Max-Planck Institute for Brain Research, 60528 Frankfurt am Main, Germany. lucia.melloni@brain.mpg.de
Cerebral Cortex (New York, N.Y. : 1991)
|January 18, 2012
Summary
Visual attention relies on bottom-up salience and top-down goals. This study reveals that in the human visual cortex, these factors interact hierarchically, with convergence in hV4 to guide visual search.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Visual Perception
Background:
- Visual attention is guided by both stimulus-driven bottom-up salience and goal-directed top-down control.
- The precise neuronal stage where these two mechanisms interact remains unclear.
Purpose of the Study:
- To investigate the hierarchical interaction of bottom-up and top-down attentional control mechanisms in the human visual cortex.
- To identify specific brain regions involved in processing salience and implementing attentional selection.
Main Methods:
- Functional magnetic resonance imaging (fMRI) was employed to study brain activity during visual search tasks.
- Analysis focused on early visual areas (V1 to hV4) and distinct cerebral networks.
Main Results:
- A hierarchy of saliency maps was observed in the visual cortex, from V1 to hV4.
- V1 processed pure bottom-up signals, V2 responded to top-down modulations, and hV4 showed convergence of both.
- Top-down control involved the left intraparietal sulcus (distractor suppression) and frontal eye field/lateral occipital cortex (target enhancement).
Conclusions:
- Attentional selection is implemented through integrated saliency maps within the visual cortex.
- These integrated maps provide topographic information crucial for successful visual search by distinguishing targets from distractors.
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