Spontaneous alpha brain dynamics track the episodic "when"
Les bouffées d’ondes cérébrales dîtes « alpha » indiqueraient le temps épisodique
Résumé
We seldom intently measure how long life experiences last, yet we seemingly remember them fairly. Research has revealed, across species, the existence of neurons that can track time over the course of seconds to minutes. Herein, we asked, using magnetoencephalography (MEG), whether a neural signature of time-tracking could be found in human participants. Participants were instructed to stay quietly awake with no further instructions (retrospective timing) or to estimate how much time will pass (prospective timing). At the end of the recording, they were all asked to report how much time had passed. When not instructed to attend to the passage of time, the relative duration of α bursts (α: 7-14 Hz) during the recording linearly predicted participants’ retrospective time estimates. This relation did not hold when participants timed prospectively. In a control study, the relative duration of α bursts with retrospective timin was preserved even when participants were engaged in a visual counting task. At the time scale of minutes, we thus report evidence that the relative time of spontaneous oscillatory burstiness is a good predictor of retrospective time and conclude that in the absence of overt attention to time, α bursts embody discrete states of awareness for episodic timing.
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