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Published on: July 26, 2019
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Electrophysiological correlates of sustained conscious perception
Annika Hense1, Antje Peters2,3, Maximilian Bruchmann2,3
1Institute of Medical Psychology and Systems Neuroscience, University of Münster, Von-Esmarch-Str. 52, 48149, Münster, Germany. annika.hense@uni-muenster.de.
Scientific Reports
|May 8, 2024
Summary
Sustained visual awareness negativities (SVAN) correlate with stimulus duration, not just onset. This study used prolonged visual stimuli to show awareness-related brain activity lasts as long as the conscious percept.
Area of Science:
- Neuroscience
- Cognitive Science
- Visual Perception
Background:
- The visual awareness negativity (VAN) is an early event-related potential linked to conscious visual perception.
- Previous studies used brief stimuli, leaving uncertainty about whether VAN reflects transient responses or sustained conscious experience.
Purpose of the Study:
- To investigate if awareness-related negativities persist throughout stimulus presentation.
- To differentiate between transient onset-related responses and sustained neural activity corresponding to the duration of a conscious percept.
Main Methods:
- Employed a novel visual stimulation design with prolonged stimulus durations (500 or 1000 ms).
- Used event-related potentials (ERPs) to compare neural activity between informed (aware) and uninformed (unaware) participants regarding a hidden face stimulus.
- Recorded brain activity from 62 participants during a visual task.
Main Results:
- An enhanced negativity over occipitotemporal electrodes was observed.
- This negativity persisted for the entire duration of the stimulus presentation in aware participants.
- Identified sustained visual awareness negativities (SVAN) associated with prolonged conscious perception.
Conclusions:
- Sustained visual awareness negativities (SVAN) are linked to the duration of conscious visual experience.
- Findings suggest that neural correlates of consciousness can be sustained, not just transient.
- The study provides crucial evidence for the temporal dynamics of awareness-related neural activity.
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