EEG Decoding of Conscious versus Unconscious Representations during Binocular Rivalry.

Area of Science:

• Neuroscience
• Cognitive Science
• Psychology

Background:

• Theories of visual awareness propose either rapid emergence in visual cortex or slower development via frontoparietal interactions.
• Investigating the timing of conscious perception is crucial for understanding the neural basis of awareness.

Purpose of the Study:

• To test early theories of visual awareness by determining the latency of neural differences between perceived and unperceived stimuli.
• To assess when decodable information about consciously perceived stimuli enhances relative to non-perceived stimuli.

Main Methods:

• Combined electroencephalography (EEG) with multivariate pattern classification.
• Utilized binocular rivalry with competing red and green gratings.
• Decoded grating orientation for both perceived and suppressed stimuli from EEG patterns.

Main Results:

• Decoding accuracy for consciously perceived orientation significantly exceeded that for unperceived orientation starting at 160 milliseconds post-stimulus onset.
• This rapid differentiation supports theories positing a fast onset for visual awareness.

Conclusions:

• Neural representations of consciously perceived stimuli diverge from unperceived stimuli significantly earlier than predicted by some theories.
• Findings support models where visual awareness arises rapidly within the visual cortex.