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Cortical Dynamics Underlying Perceived Visibility: An Event-Related Potential Investigation of Forward Masking
Afife Turker1,2,3, Haluk Ogmen4, Hulusi Kafaligonul1,2,3,5
1Department of Neuroscience, Bilkent University, Ankara, Türkiye.
The European Journal of Neuroscience
|October 25, 2025
Summary
Forward masking significantly impacts visual perception, with event-related potentials (ERPs) revealing neural processes. Short stimulus onset asynchrony and high contrast enhance suppression, while longer durations show facilitation.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Visual Perception
Background:
- Forward masking is crucial for understanding visual processing dynamics.
- Neural correlates and cortical processes of forward masking remain underexplored.
- Specific event-related potential (ERP) components for forward masking are unidentified.
Purpose of the Study:
- To identify ERP components associated with forward masking.
- To investigate cortical processes influencing perceived visibility under forward masking.
- To examine the effects of stimulus onset asynchrony (SOA) and mask-to-target (M/T) contrast ratio on forward masking.
Main Methods:
- An ERP study combined with a forward-masking paradigm.
- Observers performed a contour discrimination task on a target.
- Manipulation of SOA and M/T contrast ratio to create varied masking conditions.
Main Results:
- Perceived target visibility was dependent on SOA, with strong suppression at short SOAs.
- Mask-to-target contrast ratio significantly enhanced the magnitude of inhibition.
- Nonlinear suppressions were observed in early P1 and late positive components, increasing with shorter SOA and higher M/T contrast.
- N1 component showed facilitation, becoming dominant at longer SOAs.
Conclusions:
- Findings provide insights into the ERP correlates of forward masking.
- Highlights the multiprocess nature of contextual influences on visual perception.
- Supports a three-process explanation for forward masking based on empirical and modeling studies.
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