To investigate the relationship between two behavioral markers of arousal (pupil size and brain activity) and perceptual decision-making, recordings were simultaneously obtained on pupil size and brain activity using magnetoencephalography (MEG). Data was collected from a total of 24 adult participants during eyes-open rest sessions and a visual perceptual decision-making task.

Two 5-minute rest session recordings were obtained from 21 participants; 3 participants completed one rest session each. Every task trial included a prestimulus interval followed by a liminal object stimulus, then two forced-choice decisions to categorize the stimulus (i.e., face, house, object, or animal) and to indicate whether the stimulus was recognizable (i.e., yes or no). During the prestimulus interval, participants were presented with a fixation cross on a gray background for 3 to 6 seconds. A total of 360 trials were completed; 300 with meaningful stimulus and 60 with scrambled images.

The investigators have shared subject-level source data for the following analyses:

• Prestimulus baseline data for power-pupil relationship per RSN and frequency band
• Resting state power-pupil relationship per RSN and frequency band
• Perceptual behavior (hit rate, false alarms rate, reaction time, sensitivity, criterion, and accuracy) as a function of pupil size
• Post-stimulus categorization accuracy according to time point and prestimulus pupil size
• “Yes”/“No” discrimination
• Residual power’s relationship to perceptual behavior for each RSN and frequency band
• Perceptual behavior sorted by prestimulus fast pupil dynamics