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  • You have to be at least 18 years old to participate in our experiments.
  • For each experiment, a certain number of registered subjects will receive an email invitation to sign up for one of the sessions.
  • In case you receive such invitation email and would like to participate, you have to open the link included in the email and sign up for one of the available sessions. Without signing up, you will not be able to participate. By opening the link, you indicate your commitment to arriving in time to the experiment site and to being able to participate for the entire duration of the session indicated on the sign-up website.
  • Do not create multiple accounts. If you do so, you will be excluded from participation in this and any future experiments that we run.
  • Please do not sign up for more than one session of the given experiment. If you do so, you will be excluded from participation in this and any future experiments that we run.
  • Please note that only the invited subjects have the right to sign up. Also note that each experimental session offers a limited number of participant slots, so if you are interested to participate, make sure to sign up early.
  • For each experimental session, an excess number of subjects will be be allowed to sign up. If more than a required number of subjects arrive on site in time, participating subjects will be selected randomly. Subjects who are not selected to participate due to such capacity constraints or due to failures on the part of the experimenter will be compensated by a show-up payment specified in the invitation email.
  • Every participant who signs up for a given session and arrives on site in time will be compensated by at least this show-up payment.
  • Please bring a picture ID with you so that we can verify your identity. This is done in order to preclude repeated participation of the same subject in a single experiment.
  • In order to participate in the experiment, you will have to sign a "Subject Consent Form" on site before the start of the session.
  • Unless specified otherwise in the invitation email, participating subjects will be paid in cash at the end of the session. Non-participating signed-up subjects who arrive on site in time will be paid in cash just before the session.

  • For questions please contact