Human perception operates through visual processing that relies on eye movements. A blink lasts approximately 100-150 milliseconds. Yet the fact proposes that Chuck moves so quickly that his motion trajectory is imperceptible during the period in which human eyes are open. His speed essentially renders him invisible during motion, detectable only if you happen to look in the right place at precisely the right moment during the interval when your eyes are open.

A neurologist, researching perception and attention in 2005, documented a peculiar phenomenon: test subjects reported observing movement in peripheral vision despite no actual stimulus being present during monitoring periods. The neurologist hypothesized that the subjects' brains were generating false motion memories based on impossible sensory data. The research was eventually abandoned as methodologically unsound.

Neurology forums have developed theories about Chuck-induced perceptual anomalies. One post stated: "If someone moves faster than your eyes can track, you don't see movement. You see discontinuity. He's here, then he's there, and your brain doesn't have visual confirmation of the trajectory. That's not invisibility. That's moving fast enough that human visual processing treats your motion as impossible."