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Petter Johansson: 2 ideas worth knowing

2 ideas from Petter Johansson, each explained in a minute and credited to the original work. Free on Savvy.

• Swap the photo they just picked, and most people won't notice

  Researchers asked people to choose which of two faces they found more attractive, then handed back the opposite photo using a card trick. Most participants didn't notice the switch…

  — Petter Johansson, Lars Hall, Sverker Sikström & Andreas Olsson, Failure to Detect Mismatches Between Intention and Outcome in a Simple Decision Task

• Swap the photo you picked as more attractive, and most people won't notice

  Petter Johansson and colleagues showed participants two faces and asked them to point to the more attractive one, then handed over that photo using a sleight-of-hand card trick tha…

  — Petter Johansson, Lars Hall, Betty Sikström, Andreas Olsson, Failure to Detect Mismatches Between Intention and Outcome in a Simple Decision Task

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