Legally blind participants (uncorrected vision of 20/200+) were able to identify a visual stimulus attribute (clock hand position) in the absence of consciously identifying its presence. Specifically, participants with their corrective lenses removed correctly guessed the hour-hand position above chance (8%) on a clockface shown on a computer screen. This occurred both when presented in a 1-clockface display (28%), as well as when shown a display containing 4 clockfaces (21%), in which only 1 face contained a hand. Even more striking, hand identification accuracy in the 4-clockface condition was comparable whether the clockface containing the hand was (21%) or was not (20%) correctly identified. That legally blind individuals are capable of identifying stimulus attributes without conscious awareness provides an additional vehicle for exploring implicit perception. Consistent with previous research, the visualsystem can apparently cope with degraded visual input through information available through a(n unconscious) secondary pathway via the superior colliculi. (C) 2013 Elsevier Inc. All rights reserved.
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Ctr Hosp Univ Reims, Hop Robert Debre, Serv Ophtalmol, Reims, FranceCtr Hosp Univ Reims, Hop Robert Debre, Serv Ophtalmol, Reims, France
Dormegnie, Louis-Philippe
Henry, Adrien
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Ctr Hosp Univ Reims, Hop Robert Debre, Serv Ophtalmol, Reims, FranceCtr Hosp Univ Reims, Hop Robert Debre, Serv Ophtalmol, Reims, France
Henry, Adrien
Salmon, Jean-Hugues
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Ctr Hosp Univ Reims, Hop Maison Blanche, Serv Rhumatol, Reims, FranceCtr Hosp Univ Reims, Hop Robert Debre, Serv Ophtalmol, Reims, France
Salmon, Jean-Hugues
N'Guyen, Yohan
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Ctr Hosp Univ Reims, Hop Robert Debre, Serv Med Interne Malad Infect & Immunol Clin, Reims, FranceCtr Hosp Univ Reims, Hop Robert Debre, Serv Ophtalmol, Reims, France
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Prince Charles Hosp, Thorac Med, Brisbane, Qld, Australia
Univ Queensland, Fac Med, UQ Thorac Res Ctr, Brisbane, Qld, AustraliaPrince Charles Hosp, Thorac Med, Brisbane, Qld, Australia
Olive, Gerard N.
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Yang, Ian A.
Marshall, Henry
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Prince Charles Hosp, Thorac Med, Brisbane, Qld, Australia
Univ Queensland, Fac Med, UQ Thorac Res Ctr, Brisbane, Qld, AustraliaPrince Charles Hosp, Thorac Med, Brisbane, Qld, Australia