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Cross-Modal Multivariate Pattern Analysis
Published on: November 9, 2011
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Visual experience forms a multidimensional pattern that is not reducible to a single measure: Evidence from
Nora Koster1, Uwe Mattler1, Thorsten Albrecht1
1,.
Journal of Vision
|March 18, 2020
Summary
Visual masking reveals diverse subjective experiences beyond simple awareness. Different aspects of visual perception, like timing and contrast, can be reported, showing awareness is multidimensional and not captured by single measures.
Area of Science:
- Cognitive Psychology
- Visual Perception
- Neuroscience
Background:
- Metacontrast masking is a technique used to study visual awareness.
- Previous research suggests visual experience is complex, but its full extent is debated.
Purpose of the Study:
- To investigate the richness and diversity of subjective visual experience using metacontrast masking.
- To explore the relationship between subjective reports and objective measures of visual awareness.
Main Methods:
- A metacontrast masking paradigm with shape-congruent and incongruent targets and masks was used.
- Participants reported specific perceived aspects of the target after training.
- Objective discrimination performance was measured and compared with subjective reports.
Main Results:
- Seven distinct target percepts were identified and systematically varied with stimulus onset asynchrony (SOA) and congruency.
- Subjective reports of percepts showed dissociations from objective discrimination performance.
- Masking functions varied individually across SOAs.
Conclusions:
- Subjective visual awareness under metacontrast is multidimensional and not fully captured by single measures.
- Dissociations between subjective and objective measures challenge the use of simple, one-dimensional assessments of awareness.
- Visual masking research highlights the complexity of conscious perception.
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