Laboratoire Psychologie de la Perception Institut Neurosciences Cognition Université Paris Descartes Centre National de Recherche Scientifique
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Erratum to: Response trajectories reveal conflict phase in image--Word mismatch.

Reports an error in "Response trajectories reveal conflict phase in image-word mismatch" by Floris T. van Vugt and Patrick Cavanagh (Attention, Perception, & Psychophysics, 2012[Feb], Vol 74[2], 263-268). The abstract was inadvertently left out of the original article. The original abstract appears in the erratum. (The following abstract of the original article appeared in record 2012-04987-003). In this article, we studied a processing conflict involving spatial propositions in which a marker was placed above or below the word ABOVE or BELOW, and in which the participant reported the location of the marker relative to the word, ignoring the meaning of the latter. Using an interleaved task, we found clear evidence of a conflict period in which the incongruity between the word and its location either delayed the start of the trajectory to the correct answer or interrupted it. To examine the timing of the conflict, we varied the SOA of the word and the location marker; the marker also indicated the type of task (for a similar approach, see the speed-accuracy trade-off method. The task had two conditions: location trials and word trials. The shape of the marker indicated which response was required on each trial: An X indicated that participants were to report the location of the marker relative to the word and to ignore the meaning of the word, whereas an O indicated that they were to report the meaning of the word and ignore the location of the marker. To initiate each trial, the participant clicked with the mouse on a button in the bottom of the screen. We investigated the evolution of the movement direction over time for each participant separately using their average movement trace in each of the eight experimental conditions: 2 subtasks X 4 SOAs. Using response trajectories in word and location judgment tasks, we find a remarkably distinctive and stable decision moment at approximately 250 ms when the participant has enough information to begin to respond. In incongruent trials, we also find clear evidence of a conflict that delays or interrupts the response and lasts about 130 ms. In the present study, we provided evidence of a reliable Stroop-like effect with spatial prepositions in participant's movement trajectories. Instead of the reaction time we investigated the response tendencies by analyzing the movement direction of the trajectory. (PsycINFO Database Record (c) 2012 APA, all rights reserved)