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.