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Correlation between Pupil Size and Subjective Passage of Time in Non-Human Primates

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Title: Correlation between Pupil Size and Subjective Passage of Time in Non-Human Primates
Authors: Suzuki, Tomoki W. Browse this author
Kunimatsu, Jun Browse this author →KAKEN DB
Tanaka, Masaki Browse this author →KAKEN DB
Keywords: eye movements
pupil diameter
temporal processing
Issue Date: 2-Nov-2016
Publisher: Society for Neuroscience
Journal Title: Journal of neuroscience
Volume: 36
Issue: 44
Start Page: 11331
End Page: 11337
Publisher DOI: 10.1523/JNEUROSCI.2533-16.2016
PMID: 27807173
Abstract: Our daily experience of time is strongly influenced by internal states, such as arousal, attention, and mood. However, the underlying neuronal mechanism remains largely unknown. To investigate this, we recorded pupil diameter, which is closely linked to internal factors and neuromodulatory signaling, in monkeys performing the oculomotor version of the time production paradigm. In the self-timed saccade task, animals were required to make a memory-guided saccade during a predetermined time interval following a visual cue. We found that pupil diameter was negatively correlated with trial-by-trial latency of self-timed saccades. Because no significant correlation was found for visually guided saccades, correlation of self-timed saccades could not be explained solely by the facilitation of saccade execution. As the reward amount was manipulated, pupil diameter and saccade latency altered in opposite directions and the magnitudes of modulation correlated strongly across sessions, further supporting the close link between pupil diameter and the subjective passage of time. When the animals were trained to produce two different intervals depending on the instruction, the pupil size again correlated with the trial-by-trial variation of saccade latency in each condition; however, pupil diameter differed significantly for saccades with similar latencies generated under different conditions. Our results indicate that internal brain states indexed by pupil diameter, which parallel noradrenergic neuronal activity (Aston-Jones and Cohen, 2005), may bias trial-by-trial variation in the subjective passage of time.
Type: article
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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