To test this idea, Eagleman and his team designed a special digital watch, which displayed a series of numbers that flickered so quickly that they were impossible to read in normal conditions. Then he persuaded some brave volunteers to repeatedly perform scary adrenaline-loaded leaps into the void while staring at their flickering watches. If an internal clock was indeed speeding up, then—his reasoning went—the volunteers should see the blur resolve into readable numbers while in free fall. They couldn’t, so his study provided no evidence for an internal clock. Of course, absence of evidence
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