The purpose of this study was to measure and analyze viewers' electroencephalographic reactions to motion and still pictures, and to increase knowledge on the differential impact of the two modes on brain wave production. Since beta brain wave indicates focused attention, an additional purpose was to determine whether the two media differed significantly in their potential as teaching devices as measured by the viewers' beta brain wave production. Portable biofeedback equipment was used to collect data on 60 randomly selected subjects. Treatments were either a motion picture or a slide tape presentation, alternately shown to each subject. Using a two-way analysis of variance and a post hoc analysis, no significant main effects or interactions were identified. Neither motion nor still pictures differentially affected the production of beta waves, which are necessary for focused attention and mental concentration. The experiment did demonstrate the successful use of a psychophysiological measuring device which offers the opportunity to measure an individual's reactions to instructional media unobtrusively. (LMM)