Breaking continuous flash suppression: competing for consciousness on the pre-semantic battlefield.

Two of these studies ( Stein et al., 2011b ; Gray et al., 2013 ) also included a polarity inversion condition, demonstrating that detection times were fastest for normal faces (upright and normal polarity) and slowest for the most unusual face presentation condition (spatial inversion and inversed polarity), although the inversion effect was only marginally significant in the inversed polarity condition of Stein et al.

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