Spontaneous Entry into an "Offline" State during Wakefulness: A Mechanism of Memory Consolidation?

Journal of Cognitive Neuroscience
Erin J Wamsley, Theodore Summer

Abstract

Moments of inattention to our surroundings may be essential to optimal cognitive functioning. Here, we investigated the hypothesis that humans spontaneously switch between two opposing attentional states during wakefulness-one in which we attend to the external environment (an "online" state) and one in which we disengage from the sensory environment to focus our attention internally (an "offline" state). We created a data-driven model of this proposed alternation between "online" and "offline" attentional states in humans, on a seconds-level timescale. Participants (n = 34) completed a sustained attention to response task while undergoing simultaneous high-density EEG and pupillometry recording and intermittently reporting on their subjective experience. "Online" and "offline" attentional states were initially defined using a cluster analysis applied to multimodal measures of (1) EEG spectral power, (2) pupil diameter, (3) RT, and (4) self-reported subjective experience. We then developed a classifier that labeled trials as belonging to the online or offline cluster with >95% accuracy, without requiring subjective experience data. This allowed us to classify all 5-sec trials in this manner, despite the fact that subjective exp...Continue Reading

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