Differential BOLD activity associated with subjective and objective reports during "blindsight" in normal observers

Area of Science:

• Neuroscience
• Cognitive Science
• Visual Perception

Background:

• Conscious visual perception studies require subjective (introspective) or objective (forced-choice) reports.
• The relationship between report type and functional Magnetic Resonance Imaging (fMRI) Blood-Oxygen-Level-Dependent (BOLD) signals is not well understood.

Purpose of the Study:

• To investigate the dissociation between subjective and objective reports in visual perception.
• To determine how different report types correlate with brain activity, specifically fMRI-BOLD signals.

Main Methods:

• Utilized continuous flash suppression (CFS) to render visual targets invisible.
• Compared brain activity (fMRI-BOLD) associated with subjective visibility reports versus objective (forced-choice) performance.
• Analyzed brain regions involved in subjective experience versus objective task accuracy.

Main Results:

• Observed a dissociation between subjective visibility and objective performance (blindsight).
• Subjective visibility effects were localized in higher-order visual areas, independent of objective performance.
• Objective performance accuracy correlated with multivariate pattern classification in early visual areas.

Conclusions:

• Subjective and objective reports of visual perception are underpinned by distinct neural mechanisms.
• Different cortical areas and signal amplitudes are associated with introspective awareness versus objective task performance.
• Findings suggest separate neural pathways for conscious experience and task-specific visual processing.