...Hassin’s key experiment involved presenting arithmetic questions unconsciously. The questions would be things like "9 - 3 - 4 = " and they would be followed by the presentation, fully visible, of a target number that the participants were asked to read aloud as quickly as possible. The target number could either be the right answer to the arithmetic question (so, in this case, "2") or a wrong answer (for instance, "1"). The amazing result is that participants were significantly quicker to read the target number if it was the right answer rather than a wrong one. This shows that the equation had been processed and solved by their minds – even though they had no conscious awareness of it – meaning they were primed to read the right answer quicker than the wrong one.
The result suggests that the unconscious mind has more sophisticated capacities than many have thought. Unlike other tests of non-conscious processing, this wasn’t an automatic response to a stimulus – it required a precise answer following the rules of arithmetic, which you might have assumed would only come with deliberation. The report calls the technique used "a game changer in the study of the unconscious", arguing that "unconscious processes can perform every fundamental, basic-level function that conscious processes can perform".
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