In an ESP experiment, people are asked to use their gut / intuition to predict which of five Zener cards was selected for that trial. First, you will complete 5 trials in which you try to predict which card was selected.

In the following exercise, you will be presented with five Zener cards. You will have to predict which of those cards will show up on the screen. Once you select a card, you will be asked if it is your final selection. If it is, click "Yes" and you will be shown the card. You will not be able to change your answer at this point. If it is not, click "No" and you will be able to select a new card.

When you finish this exercise, you will be given your score out of five to be shown your accuracy on guessing the cards.

Can you guess which card I'm thinking of?

Is this your final choice?

YES

NO

Congratulations! You guessed correctly!

You guessed incorrectly. Sorry!

Congratulations! You guessed correctly!

You guessed incorrectly. Sorry!

Congratulations! You guessed correctly!

You guessed incorrectly. Sorry!

Congratulations! You guessed correctly!

You guessed incorrectly. Sorry!

Congratulations! You guessed correctly!

You guessed incorrectly. Sorry!

Results - Round One

In this task, statistically we would expect you to have a score of 1 correct answer (there is a 1 in 5 chance at being correct in 5 trials). Most of you probably scored a 0, 1, or 2, which would be expected by chance (most scores should be at or near statistical chance). However, some of you may have scored higher. You may think that this suggests you have ESP, but because we only looked at 5 trials, you may have simply had a few lucky guesses.

To check for this, you will repeat the exercise with additional trials. When you finish this exercise, you will be given your score out of twenty-five to be shown your accuracy on guessing the cards.

Results - Round Two

With 25 trials, statistical chance performance would be approximately 5 correct answers (give or take a few). As you probably noticed, most (if not all) of you likely scored between 1 and 9 correct answers, which would be expected by statistical chance. Also, some of you who scored above chance on the first test may have scored lower than chance on the second test (or vice versa).

This demonstrates that people's performance is due to statistical chance / probabilities, and not ESP. As a final note, if any of you scored higher than 12, please let me know as I would like your help choosing some lottery numbers (just kidding!).