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Priming of natural scene categorization during continuous flash suppression.

Leonie Baumann¹, Christian Valuch²

¹Department of Experimental Psychology, University of Goettingen, Germany.

Consciousness and Cognition

|August 25, 2022

Summary

Scene category processing occurs even during Continuous Flash Suppression (CFS), though some stimulus visibility is needed. This study investigated priming effects with suppressed and unsuppressed visual stimuli.

Keywords:

Categorization task Interocular suppression Natural scenes Priming Real-world scenes Semantic processing Unconscious processing

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Area of Science:

Cognitive Neuroscience
Visual Perception

Background:

Continuous Flash Suppression (CFS) is used to reduce conscious awareness of visual stimuli.
Debate exists on whether CFS-suppressed stimuli undergo categorical or semantic processing.

Purpose of the Study:

To investigate the level of scene processing during CFS using a priming paradigm.
To determine if categorical information is accessible for stimuli rendered unconscious by CFS.

Main Methods:

A priming paradigm with indoor and outdoor scene photographs was employed.
Participants reported target scene categories after viewing CFS-suppressed or unsuppressed primes.
Stimulus onset asynchrony (SOA) and prime visibility were manipulated.

Main Results:

Priming effects were observed, indicating categorical processing of suppressed stimuli.
Priming effects were smaller (approx. 10 ms) under CFS compared to unsuppressed conditions (approx. 24 ms).
Priming under CFS was modulated by prime visibility and SOA.

Conclusions:

Scene category information is processed during CFS, but requires some residual prime visibility.
The findings suggest that unconscious processing during CFS operates at a categorical level.
Further research is needed to fully elucidate the extent and limitations of unconscious visual processing.