Fowler, Stephen – Dynamics of Response: Uninterrupted Measurement of the Behavior Stream – This tutorail ill show 1) how the behavior analytic reach of operant conditioning methods can be increased by examining force, duration, and time integral of force (effort) of individual operant responses and 2) will describe a non-video method (i.e., force-plate actometer as the floor of an operant chamber) for tracking and otherwise quantifying behaviors that occur during interresponse times. Measurement of operant response force, durationand effort introduces new levels of complexity and apparatus considerations that are not present when responses are treated as intermittent, dimensionless event. These issues will be addressed in the context of selected behavioral pharmacology experiments with emphasis on the drugs that affect brain dopamine systems. Tracking and measuring drug-induced behaviors with a force-plate as the floor of an operant chamber will be illustrated in two different paragrams: 1)rats self-administering cocaine and 2) rats performing on the 72-s differential reinforcement of low rate schedule of reinforcement under baseline and amphetamine-treatment conditions. Recent pertinent work conducted between the writing of this abstract and the convening of the annual meeting may also be described.