Abstract
Foreknowledge about upcoming events may be exploited to optimize behavioural responses. In a previous work, using an eye movement paradigm, we showed that different types of partial foreknowledge have different effects on saccadic efficiency. In the current study, we investigated the neural circuitry involved in processing of partial foreknowledge using functional magnetic resonance imaging. Fourteen subjects performed a mixed antisaccade, prosaccade paradigm with blocks of no foreknowledge, complete foreknowledge or partial foreknowledge about stimulus location, response direction or task. We found that saccadic foreknowledge is processed primarily within the well-known oculomotor network for saccades and antisaccades. Moreover, we found a consistent decrease in BOLD activity in the primary and secondary visual cortex in all foreknowledge conditions compared to the no-foreknowledge conditions. Furthermore we found that the different types of partial foreknowledge are processed in distinct brain areas: response foreknowledge is processed in the frontal eye field, while stimulus foreknowledge is processed in the frontal and parietal eye field. Task foreknowledge, however, revealed no positive BOLD correlate. Our results show different patterns of engagement in the saccade-related neural network depending upon precisely what type of information is known ahead.
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Acknowledgments
MA was supported by the Swiss National Science Foundation. JB was supported by a Canada Research Chair and the Marianne Koerner Chair in Brain Diseases. This work was supported by CIHR grant MOP-81270.
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Bär, S., Hauf, M., Barton, J. .S. et al. The neural network of saccadic foreknowledge. Exp Brain Res 234, 409–418 (2016). https://doi.org/10.1007/s00221-015-4468-5
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DOI: https://doi.org/10.1007/s00221-015-4468-5