PT  - JOURNAL ARTICLE
AU  - Sneha Shashidhara
AU  - Yaara Erez
TI  - Reward motivation does not modulate coding of behaviorally relevant category distinctions across the frontoparietal cortex
AID  - 10.1101/609537
DP  - 2019 Jan 01
TA  - bioRxiv
PG  - 609537
4099  - http://biorxiv.org/content/early/2019/12/09/609537.short
4100  - http://biorxiv.org/content/early/2019/12/09/609537.full
AB  - Selection and integration of information based on current goals is a fundamental aspect of flexible goal-directed behavior. Motivation has been shown to improve behavioral performance across multiple cognitive tasks, yet the underlying neural mechanisms that link motivation and control processes, and in particular its effect on context-dependent information processing, remain unclear. Here, we used functional magnetic resonance imaging (fMRI) in 24 human volunteers to test whether reward motivation enhances the coding of behaviorally relevant category distinctions across the frontoparietal cortex, as would be predicted, based on previous experimental evidence and theoretical accounts. In a cued-detection categorization task, participants detected whether an object from a cued visual category was present in a subsequent display. The combination of the cue and the visual category of the object determined the behavioral status of the presented objects. To manipulate motivation, half of all trials offered the possibility of a substantial reward. We observed an increase with reward in overall activity across the frontoparietal control network when the cue was presented, reflecting cognitive effort when the context is set for a task. Multivariate pattern analysis (MVPA) further showed that behavioral status information for the objects presented was conveyed across the network. However, in contrast to our prediction, reward did not increase the discrimination between behavioral status conditions in the stimulus epoch of a trial when object information was processed depending on a current context. In the high-level general object visual region, the lateral occipital complex, the representation of behavioral status was driven by visual differences and was not modulated by reward. Our study provides another tier of evidence for the interaction between cognitive control and motivation to further inform computational models of reward and contribute to the understanding of the underlying neural mechanisms.