Awareness of "Invisible" Arrows in a Metacontrast Masking Paradigm

Area of Science:

• Cognitive Psychology
• Neuroscience
• Perception Research

Background:

• Unconscious perception research commonly employs masking techniques (pattern or metacontrast) to hide prime stimuli.
• Recent studies question if metacontrast masking truly renders prime stimuli completely imperceptible.

Purpose of the Study:

• To investigate the relationship between prime awareness, identification, and priming effects under metacontrast masking.
• To determine if prime stimuli are truly invisible to consciousness during metacontrast masking.

Main Methods:

• Concurrently measured prime awareness, target response time priming, and prime identification.
• Utilized three prime-mask stimulus onset asynchronies (27, 40, and 67 ms).

Main Results:

• Increased prime awareness ratings correlated with improved prime identification performance.
• Significant prime identification occurred even at short stimulus onset asynchronies (27 ms) with high awareness.
• Priming effects were observed even when participants reported some level of awareness of the prime stimuli.

Conclusions:

• Metacontrast masking does not necessarily eliminate conscious awareness of prime stimuli.
• Priming effects in such paradigms may depend on at least partial awareness, not complete unconsciousness.