Spookiest of all were the clues embedded in songs played backward. On a cheap turntable, I moved the speed switch midway between 331/3 and 45 to disengage the motor drive, then manually turned the record backward and listened in wide-eared wonder. The eeriest is "Revolution 9" from the White Album, in which an ominously deep voice endlessly repeats: number nine ... number nine ... number nine.... Played backward you hear: turn me on, dead man ... turn me on, dead man ... turn me on, dead man....
... What we have here is a signal-to-noise problem. Humans evolved brains that are pattern-recognition machines, adept at detecting signals that enhance or threaten survival amid a very noisy world. This capability is association learning--associating the causal connections between A and B--as when our ancestors associated the seasons with the migration of game animals. We are skilled enough at it to have survived and passed on the genes for the capacity of association learning.
Unfortunately, the system has flaws. Superstitions are false associations--A appears to be connected to B, but it is not (the baseball player who doesn't shave and hits a home run). Las Vegas was built on false association learning.
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