Uncovering the Cognitive and Neural Mechanisms Underlying Cognitive Time

Fluorodopa labelled with fluorine 18 (physical half-life of 109.6 min) is used at a dosage of 1 to 2 MBq/kg in neuroimaging, depending on the sensitivity of the PET camera used. For these reasons, a dose of 2 MBq/kg will be administered slowly intravenously (approximately 1 minute for a maximum bolus of 10 mL). PET acquisitions will be performed at 90 minutes post-injection and will last 30 minutes. Participants will be asked to have fasted for at least 4 hours at the time of injection, with no restriction on fluid intake.

The main tasks involves the comparison of duration to assess aging effects on the precision of temporal representations

Imaging of brain structure during the completion of the time perception task

Recording of neural dynamics during the completion of the time perception task

Behavioral and EEG follow-up (for older adults only)