Psychology
Why your back can mistake two pokes for one
HERE’S THE INTERESTING PART
The two-point threshold reveals the incredibly cheap sensor layout of the human back. Because survival rarely requires complex tactile data on the mid-spine, the sensory receptors there are spaced miles apart. If two distinct objects poke your back within an inch of each other, your low-resolution hardware merges the signals, assuring you that only a single object made contact.
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