Jennifer Coull

22 avril 2016

Laboratoire de Neurosciences Cognitives (LNC), UMR7291, CNRS-AMU, Marseille

Dissociating fixed from dynamic temporal probabilities with fMRI

invitée par Laurent Goffart


ABSTRACT :

Being able to predict when relevant events are likely to occur improves speed and accuracy of information processing. In a series of fMRI investigations we have found that temporally informative cues consistently activate left-lateralised parietal cortex, independent of the motor requirements of the task. Such temporal cues define fixed a priori temporal predictions. Yet temporally predictive information can also be conveyed more dynamically by the unidirectional nature of the flow of time itself. As the conditional probability, and hence subjective expectancy, of event onset increases with increased waiting time (“hazard function”), activity increases not only in left inferior parietal cortex, but also in right prefrontal cortex. These data support a role for left parietal cortex in temporal prediction generally, but a more specific role for right prefrontal cortex in the updating of temporal probabilities over time. Psychopharmacological and developmental data further support a functional dissociation in these two forms of temporal predictability.

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