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Action selection as a continuously biased process: Evidence from a rapid reaching task and a fMRI task

par Buc Calderon, Cristian ;Verguts, Tom;Gevers, Wim
Référence Cognitive Neuroscience Society 2015 annual meeting
Publication Non publié, 2015-01-15

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Résumé :

When selecting an action, traditional theories suggest acognitive architecture made of serial processing units. Other authors havesuggested instead that action selection emerges from the parallel implementationof and competition between multiple action plans. To disentanglebetween these two hypotheses, we created a reaching task allowingto assess the temporal dynamics of action selection. Crucially, contrary toprevious reaching task studies, our design did not force action selectionprocesses to operate in parallel, thus allowing an informative comparisonbetween the two theories. We manipulated the probability of congruencebetween a cue and a delayed upcoming target reach go signal. This allowedus to assess in an unbiased way if this congruence probability interacts witha subsequently selected reach trajectory (i.e. whether there is co-activationof cognition and action). We show that reach trajectories are modulatedby the probability of congruence between cue and target. Our results suggestthat action selection emerges from a competition between multipleafforded action plans, in parallel biased by relevant task factors (e.g. probabilityof reach).