Intentional motor action is typically characterized by the decision about the timing, and the selection of the action variant, known as the "what" component. We compared free action selection with instructed action, where the movement type was externally cued, in order to investigate the action selection and action representation in a Libet's task. Temporal and spatial locus of these processes was examined using the combination of high-density electroencephalography, topographic analysis of variance, and source reconstruction. Instructed action, engaging representation of the response movement, was associated with distinct negativity at the parietal and centro-parietal channels starting around 750 ms before the movement, which has a source particularly in the bilateral inferior parietal lobule. This suggests that in delayed-action tasks, the process of action representation in the inferior parietal lobule may play an important part in the larger parieto-frontal activity responsible for movement selection.

Brain and Mind Research CEITEC Central European Institute of Technology Masaryk University Kamenice 753 5 625 00 Brno Czech Republic

Brain and Mind Research CEITEC Central European Institute of Technology Masaryk University Kamenice 753 5 625 00 Brno Czech Republic; Department of Neurology St Anne's University Hospital and Faculty of Medicine MU Pekařská 664 53 656 91 Brno Czech Republic

Brain and Mind Research CEITEC Central European Institute of Technology Masaryk University Kamenice 753 5 625 00 Brno Czech Republic; Department of Neurology St Anne's University Hospital and Faculty of Medicine MU Pekařská 664 53 656 91 Brno Czech Republic; National Institute of Mental Health Topolová 748 250 67 Klecany Czech Republic

Consciousness Lab Institute of Psychology Jagiellonian University Ingardena 6 30 060 Kraków Poland

References provided by Crossref.org