Our laboratory is currently conducting studies of behavioral momentum in humans with mental retardation. A better understanding of momentum effects may contribute to more effective procedures for reducing or eliminating learning problems in this population (e.g., McIlvane & Dube, 2000). In our studies, we have occasionally encountered cases where even liberal baseline stability criteria were not met after a substantial number of sessions, and thus typical procedures for evaluating momentum were not appropriate. This brief report will describe an alternative testing procedure that we are examining for use in these situations
