Mixer Telephone Speech Study: As a MIXER Participant you will talk on the telephone with other participants –typically people you do not know– for six minutes, in either English, Arabic, Mandarin Chinese, Spanish or Russian. For this reason, as a MIXER participant, it is helpful to be fluent in English and one of the following languages: Arabic (all dialects), Mandarin, Spanish and Russian. As of March 02, 2004 (and until further notice), YOU DO NOT NEED to speak a foreign language in order to participate in MIXER. The goal number of calls for each participant is twelve (12). Visit: Linguistic Data Consortium at the University of Pennsylvania