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Causal Role of Noradrenaline in the Timing of Internally Generated Saccades in Monkeys

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Title: Causal Role of Noradrenaline in the Timing of Internally Generated Saccades in Monkeys
Other Titles: Causal role of noradrenaline in the timing of internally-generated saccades in monkeys
Authors: Suzuki, Tomoki W. Browse this author
Tanaka, Masaki Browse this author →KAKEN DB
Keywords: saccade
temporal information processing
interval timing
non-human primate
Issue Date: 16-Dec-2017
Publisher: Elsevier
Journal Title: Neuroscience
Volume: 366
Start Page: 15
End Page: 22
Publisher DOI: 10.1016/j.neuroscience.2017.10.003
PMID: 29024784
Abstract: We recently found that when monkeys performed an oculomotor version of the time production task, the trial-by-trial latency of self-timed saccades was negatively correlated with pupil diameter just before the delay period (Suzuki et al, 2016). Since pupil diameter has been shown to correlate with neuronal activity in the locus coeruleus, the level of noradrenaline (NA) in the brain might regulate the subjective passage of time. To examine this, we orally administered a selective noradrenaline reuptake inhibitor (reboxetine, 0.4-0.8 mg) when animals made a self-initiated memory-guided saccade >1 s following the appearance of a brief visual cue. We found that reboxetine delayed self-timed saccades, while the latency of visually triggered saccades remained unchanged. Because the changes in proportions and latencies of early impulsive saccades were comparable between conditions with and without drug administration, alteration of self-timing might not result from reduced impulsivity. We also assessed other behavioral parameters (saccade accuracy, velocity, and latency variance), but failed to find any drug effect except for the accuracy of visually triggered saccades in the high-dose condition, indicating that reboxetine specifically altered self-timing under our experimental conditions. Our results suggest that NA-related internal states may causally regulate temporal information processing in the brain.
Rights: © 2017. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
Type: article (author version)
Appears in Collections:医学院・医学研究院 (Graduate School of Medicine / Faculty of Medicine) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 田中 真樹

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