AUDIOMETRIC AND VISUAL PROCEDURES WERE COMPARED ANALYTICALLY AND/OR DESIGNED TO ESTABLISH TEST METHODS FOR TRAINABLE MENTAL RETARDATES IN THE IQ RANGE OF 23-47 AND BELOW THE MENTAL AGE OF 4 YEARS. THE NUMBER OF SUBJECTS WAS 26 FOR THE AUDITORY PROGRAM AND 25 FOR THE VISUAL. EACH OF THE SUBJECTS WAS STUDIED ON AN INDIVIDUAL BASIS. DATA WERE COLLECTED ON THEIR VARYING SOCIAL, MENTAL, AND PHYSICAL ABILITIES AND THEN RELATED TO THEIR AUDITORY AND VISUAL ACUITY. THE AUDIOMETRIC TESTS CONSISTED OF PURE-TONE THRESHOLD ACUITY TECHNIQUES, PSYCHOGALVANIC SKIN RESPONSE (PGSR) AUDIOMETRY, MODIFIED SPEECH RECEPTION, AND SCREENING TECHNIQUES. TWO VISUAL TEST BATTERIES WERE EMPLOYED, CONSISTING OF 8 COMMERCIALLY AVAILABLE INSTRUMENTS AND 10 MODIFIED/CONSTRUCTED TESTS PRESENTED TACHISTOSCOPICALLY WITHIN LIMITS OF EXPOSURE TIME OF .01 SECOND TO 1.0 SECOND, INCLUSIVELY. ALL TESTS WERE ADMINISTERED TO EACH CHILD ON A PRETEST, TRAINING, AND POST-TEST BASIS. THE CHILDREN IN THE AUDIOMETRIC STUDY RESPONDED MEANINGFULLY WHEN BOTH SPEECH AND PURE TONES WERE USED AS THE STIMULI. COLOR AND FORM PERCEPTION TESTS WERE CONSIDERED VERY MEANINGFUL IN THE VISUAL REALM. IMPLICATIONS FOR FURTHER STUDY WERE PROVIDED FOR BOTH THE AUDITORY AND VISUAL TEST AREAS. CONCLUSIVE TECHNIQUES ARE NEEDED TO DETECT AND REMEDY PHYSICAL DEFECTS OF THE TRAINABLE RETARDATE. (JH)