Psychology
Two taps can make a bug seem to crawl across your arm
HERE’S THE INTERESTING PART
Geldard's saltation completely breaks your tactile processing with a very simple trick. If someone heavily taps your wrist, then rapidly taps near your elbow, your biology incorrectly fills in the gap. It physically hallucinates a phantom tap directly in the middle of your forearm, fully convincing you that a giant, unseen bug has just aggressively hopped across your skin.
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