The report covers a series of investigations on the effects of biofeedback/muscle relaxation training on the academic achievement of learning disabled (LD) students. In the first study, 32 LD elementary school students made gains in all measures except arithmetic following electromyograph biofeedback/relaxation treatment. Implementation of the program with 30 language LD elementary school children yielded significant gains over controls on all dependent measures except Slosson IQ and auditory memory. The relaxation program was then incorporated as a major delivery system of the Diagnostic Education Center with 358 children over a 3 year period. As a result of treatment, significant gains were made on all dependent measures except arithmetic. A pilot investigation with four LD boys supported the theory that in the normally functioning child, the left hemisphere shifts as needed from the resisting state of 8-13 Hz activity to the sustained attention state involving the beta range 13-28 Hz; that children who perform poorly on verbal, logical, and sequential tasks as compared to their average level of ability to perform right hemisphere tasks involving spatial and holistic processing, would be expected to have difficulty in making this shift. Implications of a study with 20 LD Ss were that there is a specific hemispheric relationship with intellectual abilities and educational attainment. (SB)