First, please make sure that your question has not already been answered in the FAQ for Participants or FAQ for Researchers pages.

Please allow a few business days for reply, due to the high volume of emails received in the Xlab inbox.

We will not respond to emails after 5pm on Friday until the following Monday at the earliest.


For questions contact Rowilma del Castillo at

Xlab Participants (Students and Staff)

Contact the administrative assistants at (preferred) or leave a telephone message at (510) 642-9578 with your full name and Cal ID number (we may respond via email).

Mailing Address

Experimental Social Science Lab (Xlab)
Hearst Gymnasium, Suite 2
University of California, Berkeley
Berkeley, CA 94720-1900

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