Abstract
Stimuli presented below the threshold of awareness can systematically influence choice responses determined by the instructed stimulus-response (S-R) mapping (task set). In this study, we investigated whether such stimuli will also bias a free choice between two response alternatives under conditions in which this choice subjectively appears to be internally generated and free. Participants had to respond to targets preceded by masked arrow primes. Left-pointing and right-pointing arrow targets required left or right responses, whereas randomly interspersed “free-choice” targets indicated that the participants were free to choose either response. Although masked primes could not be consciously discriminated, they systematically affected not only performance to arrow targets, but also the free choice between response alternatives. This demonstrates that apparently “free” choices are not immune to nonconsciously triggered biases. However, in blocks in which no specific S-R mapping was imposed, masked primes did not affect free-choice performance, indicating that these effects are not automatic but are determined by currently active task sets.
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Aron, A. R., Schlaghecken, F., Fletcher, P. C., Bullmore, E. T., Eimer, M., Barker, R., Sahakian, B. J., &Robbins, T. W. (2003). Inhibition of subliminally primed responses is mediated by the caudate and thalamus: Evidence from functional MRI and Huntington’s disease.Brain,126, 713–723.
Cheesman, J., &Merikle, P. M. (1986). Distinguishing conscious from unconscious perceptual processes.Canadian Journal of Psychology,40, 343–367.
Dehaene, S., Naccache, L., Le Clec’H, G., Koechlin, E., Mueller, M., Dehaene-Lambertz, G., van de Moortele, P.-F., &Le Bihan, D. (1998). Imaging unconscious semantic priming.Nature,395, 597–600.
Eimer, M. (1999). Facilitatory and inhibitory effects of masked prime stimuli on motor activation and behavioral performance.Acta Psychologica,101, 293–313.
Eimer, M., &Schlaghecken, F. (1998). Effects of masked stimuli on motor activation: Behavioral and electrophysiological evidence.Journal of Experimental Psychology: Human Perception & Performance,24, 1737–1747.
Eimer, M., &Schlaghecken, F. (2002). Links between conscious awareness and response inhibition: Evidence from masked priming.Psychonomic Bulletin & Review,9, 514–520.
Eimer, M., Schubö, A., &Schlaghecken, F. (2002). Locus of inhibition in the masked priming of response alternatives.Journal of Motor Behaviour,34, 3–10
Gescheider, G. A. (1997).Psychophysics: The fundamentals (3rd ed.). Mahwah, NJ: Erlbaum.
Kihlstrom, J. F. (1999). The psychological unconscious. In L. A. Pervin & O. P. John (Eds.),Handbook of personality: Theory and research (2nd ed., pp. 424–442). New York: Guilford.
Klapp, S. T., &Hinkley, L. B. (2002). The negative compatibility effect: Unconscious inhibition influences reaction time and response selection.Journal of Experimental Psychology: General,131, 255–269.
Leuthold, H., &Kopp, B. (1998). Mechanisms of priming by masked stimuli: Inferences from event-related brain potentials.Psychological Science,9, 263–269.
Mandler, G., Nakamura, Y., &Van Zandt, B. J. S. (1987). Nonspecific effects of exposure on stimuli that cannot be recognized.Journal of Experimental Psychology: Learning, Memory, & Cognition,13, 646–648.
Marcel, A. J. (1983). Conscious and unconscious perception: Experiments on visual masking and word recognition.Cognitive Psychology,15, 197–237.
Neumann, O., &Klotz, W. (1994). Motor responses to nonreportable, masked stimuli: Where is the limit of direct parameter specification? In C. Umiltà & M. Moscovitch (Eds.),Attention and performance XV: Conscious and nonconscious information processing (pp. 123–150). Cambridge, MA: MIT Press, Bradford Books.
Schlaghecken, F., &Eimer, M. (1997). The influence of subliminally presented primes on response preparation.Sprache & Kognition,16, 166–175.
Schlaghecken, F., &Eimer, M. (2000). A central-peripheral asymmetry in masked priming.Perception & Psychophysics,62, 1367–1382.
Schlaghecken, F., &Eimer, M. (2001). Partial response activation to masked primes is not dependent on response readiness.Perceptual & Motor Skills,92, 208–222.
Schlaghecken, F., &Eimer M. (2002). Motor activation with and without inhibition: Evidence for a threshold mechanism in motor control.Perception & Psychophysics,64, 148–162. September 28, 2001 May 13, 2003
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The present research was partly supported by a grant to M.E. from the Biotechnology and Biological Sciences Research Council. The experiment was conducted at the Institute of Applied Cognitive Science at the University of Warwick.
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Schlaghecken, F., Eimer, M. Masked prime stimuli can bias “free” choices between response alternatives. Psychonomic Bulletin & Review 11, 463–468 (2004). https://doi.org/10.3758/BF03196596
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DOI: https://doi.org/10.3758/BF03196596