Abstract
In masked priming tasks, participants typically respond faster to compatible than to incompatible primes, an effect that has been dubbed as the positive compatibility effect (PCE). However, when the interval between the prime and the mask is relatively long, responses are faster to incompatible than to compatible primes. This inversion is called the negative compatibility effect (NCE). Two main origins of the NCE have been proposed. The object-updating theory holds that when the masks share stimulus features with the primes, both perceptual and motor processes generate an NCE. As an example, for masks composed of overlaid left and right prime arrows, the NCE is thought to be positive priming induced by the arrow of the mask pointing in the opposite direction of the prime. In contrast, the motor inhibition theories hold that the origin of the NCE is purely motor and can be demonstrated when masks do not share features with primes. To test both hypotheses, the present study aims at delineating the respective contributions of perceptual and motor components of the NCE in the context of different types of masks. Consistent with the object-updating hypothesis, we found both perceptual and motor NCEs at the long SOA with metacontrast masks (with internal contours corresponding to left and right overlaid arrows). Consistent with the motor inhibition hypothesis, we found motor NCE but no perceptual NCE at the long SOA with random-line masks (containing no prime features). The study thus suggests that the origin of the NCE depends on the type of mask.
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Notes
For arrow stimuli, the relevant perceptual information is the orientation of the arrowhead, not the orientation of the lines that composed the head. By saying even more “visually different”, we refer to the orientation of the arrowhead. As a matter of fact, in RespConflict 180° trials, prime and target are composed of lines with identical orientation (a line rotated by 180° has the same orientation as a non-rotated line), only the spatial arrangement of the lines relative to each other differs. In contrast, in RespConflict 90° trials, the lines making up the target are at a 90° angle to those making up the prime. However, this is not the relevant perceptual information in the task. Also, the prime and target were never presented in the same location so that the influence of low-level similarity of line orientation is reduced.
Because participants started each block by pressing the spacebar of the keyboard and then responded to target by choosing between the two extreme keys of the button box, the RT of the very first trial was affected by the changing of device. For this reason, it was systematically not analyzed.
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Acknowledgement
Anne Atas is a postdoctoral researcher funded by the F.R.S.-FNRS, which also supports Estibaliz San Anton (as a research fellow) and Axel Cleeremans (as a research director). This research was partly funded by Interuniversity Poles of Attraction Grant P7/33 from the Belgian Science Policy Office (BELSPO).
Conflict of interests
The authors declared that they had no conflicts of interest with respect to their authorship or the publication of this article.
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Atas, A., San Anton, E. & Cleeremans, A. The reversal of perceptual and motor compatibility effects differs qualitatively between metacontrast and random-line masks. Psychological Research 79, 813–828 (2015). https://doi.org/10.1007/s00426-014-0611-3
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DOI: https://doi.org/10.1007/s00426-014-0611-3