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Prämotorische Aktivität in fMRT: Beachtung von Dauer und Reihenfolge in abstrakten Stimulussequenzen

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Schubotz,  Ricarda Ines
Department Cognitive Neurology, MPI for Human Cognitive and Brain Sciences, Max Planck Society;

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von Cramon,  D. Yves
Department Cognitive Neurology, MPI for Human Cognitive and Brain Sciences, Max Planck Society;

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Citation

Schubotz, R. I., & von Cramon, D. Y. (2005). Prämotorische Aktivität in fMRT: Beachtung von Dauer und Reihenfolge in abstrakten Stimulussequenzen. Klinische Neurophysiologie, 36(1), 29-35. doi:10.1055/s-2004-834684.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0010-D15A-D
Abstract
Experimental evidence suggests that the human lateral premotor cortex is involved in the processing of both pragmatic and dynamic properties of our environment. In contrast to pragmatic properties inherent in everyday artifacts, dynamic stimulus properties describe even abstract stimuli and refer to their temporal duration or temporal order. However, it is an open question whether attention to dynamic properties is indeed a necessary prerequisite for premotor activation during processing of abstract stimulus sequences. Alternatively, mere exposure to such properties could suffice. The present study used functional Magnetic Resonance Imaging to address this question. We presented sequences of abstract stimuli and instructed participants to perform three different forced-choice tasks on these stimuli, either on the basis of their duration, object-related, or spatial properties. Stimulus sequences followed either local transition rules or were random. (1) If attention to dynamic properties is not a necessary prerequisite for premotor involvement in the processing of abstract stimulus sequences, but mere exposure to them suffices, we expected performance in the forced-choice tasks to elicit premotor activation during the presentation of ordered sequences but not during the presentation of random sequences. (2) If, alternatively, it is a necessary prerequisite, we expected only the forced-choice task based on stimulus duration to engage premotor areas, because only duration is an intrinsically dynamic property. Data clearly confirmed the second hypothesis. We therefore conclude that attention, but not mere exposure, to dynamic properties suffices to engage human lateral premotor cortex in abstract stimulus processing.