THE MEXICAN JOURNAL OF BEHAVIOR ANALYSIS (MJBA), (ISSN -0185-4534) is published twice a year (June and December) by the Mexican Society for Behavior Analysis. Since 1975, MJBA publishes original basic or applied research reports relevant to the behavior of nonhuman animals and humans. Review or theoretical articles, and technical notes are also considered for publication. The MJBA is a bilingual journal, publishing papers in either Spanish or English. Abstracts in both languages are also included for each article. Copyright of the papers published in the MJBA is held by the Mexican Society for Behavior Analysis. Any person wishing to reprint a paper in full or portion must secure written permission of the Editor and must give full credit to the copyright holder.

Editor in Chief:

Dr. Carlos J. Flores-Aguirre

ISSN: 0185-4534

ISSN Electrónico: 2007-0802