Unconscious Processing Contaminates Objective Measures of Conscious Perception: Evidence From the Liminal Prime...

Area of Science:

• Cognitive Psychology
• Neuroscience
• Consciousness Studies

Background:

• Assessing unconscious processing relies on accurate measures of conscious perception.
• Subjective reports and forced-choice discrimination often conflict, with observers discriminating unseen stimuli above chance.
• This discrepancy raises questions about whether subjective reports or discrimination measures are contaminated by unconscious processing.

Purpose of the Study:

• To investigate the contamination of subjective reports versus forced-choice discrimination in assessing unconscious processing.
• To clarify whether discrimination performance for unseen stimuli reflects conscious awareness or unconscious processing.

Main Methods:

• Replication of a masked response priming paradigm with a multi-point scale for reporting conscious perception.
• Measurement of prime-discrimination performance within the same experiment.
• Analysis of response priming effects across different response times and report levels.

Main Results:

• The study replicated the dissociation between subjective reports of invisibility and response priming.
• Invisibility reports were confirmed to be uncontaminated by conscious perception.
• Above-chance prime-discrimination performance was observed for stimuli rated as unseen.

Conclusions:

• Forced-choice discrimination performance is contaminated by unconscious processing, not subjective reports by conscious perception.
• This finding has significant implications for methodologies used to study unconscious cognition.
• The results highlight the need for careful consideration of measurement contamination in consciousness research.