Perception without awareness: further evidence from a Stroop priming task.

Full Abstract

In the present research, we examined the influence of prime-target stimulus onset asynchrony (SOA) on Stroop-priming effects from masked words. Participants indicated the color of a central target, which was preceded by a 33-msec prime word followed either immediately or after a variable delay by a pattern mask. The prime word was incongruent or congruent with the target color on 75% and 25% of the trials, respectively. The words followed by an immediate mask produced reliable Stroop interference at SOAs of 300 and 400 msec but not at SOAs of 500 and 700 msec. The words followed by a delayed mask produced a reversed (i.e., facilitatory) Stroop effect, which reached significance at an SOA of 400 msec or longer, but never at the shorter 300-msec SOA. Such an differential time course of both types of Stroop priming effects provides further evidence for the existence of qualitative differences between conscious and nonconscious perceptual processes.

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Author information

Author/s: Daza, M Teresa (MT); Ortells, Juan J (JJ); Fox, Elaine (E);

Affiliation: Departamento de Neurociencia y Ciencias de la Salud, Facultad de Humanidades y Ciencias de la Educación, University of Almería, Almería, Spain. tdaza(-atsign-)ual.es

Journal and publication information

Publication Type: Journal Article; Research Support, Non-U.S. Gov't

Journal: Perception & psychophysics (Percept Psychophys), published in United States. (Language: eng)

Reference: 2002-Nov; vol 64 (issue 8) : pp 1316-24

Dates: Created 2003/01/09; Completed 2003/02/13; Revised 2006/11/15;

PMID: 12519028, status: MEDLINE (last retrieval date: 12/26/2008)

Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.

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