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Changes in connectivity profiles as a mechanism for strategic control over interfering subliminal information
Thomas Wolbers1, Eszter D Schoell, Rolf Verleger
1NeuroImage Nord, Department of Systems Neuroscience, University Medical Center Hamburg-Eppendorf, Germany. wolbers@uke.uni-hamburg.de
Strategic control over subliminal stimuli involves the pre-supplementary motor area (pre-SMA). This brain region modulates perception and motor selection, demonstrating conscious influence over unconscious information processing.
Area of Science:
- Cognitive Neuroscience
- Neuroimaging
- Human Behavior
Background:
- Subliminal stimuli can influence human behavior.
- Evidence suggests conscious control over subliminal stimulus processing.
- The neural basis of this control remains unclear.
Purpose of the Study:
- To identify the cortical network for strategic control over subliminal information.
- To investigate how the brain manages conflicting subliminal stimuli.
- To understand the role of specific brain regions in this process.
Main Methods:
- Functional magnetic resonance imaging (fMRI) in 14 participants.
- Metacontrast masking paradigm with varied conflict levels.
- Psychophysiological interaction (PPI) analysis.
Main Results:
- Behavioral performance showed strategic effects with high conflict.
- The pre-supplementary motor area (pre-SMA) showed context-dependent covariation.
- Pre-SMA interacted with the lateral occipital complex (LOC) and putamen.
Conclusions:
- The pre-SMA plays a superordinate role in controlling subliminal information processing.
- This control involves simultaneous modulation of perceptual analysis and motor selection.
- Strategic control allows conscious influence over unconscious processing.
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