TO DETERMINE WHETHER SELECTIVE REINFORCEMENT OF PURSUIT ROTOR PERFORMANCE FACILITATES ACQUISITION OF SKILL AND PROMOTES ITS RETENTION, FIVE GROUPS OF SUBJECTS WERE INDIVIDUALLY TRAINED FOR TEN SESSIONS OF 15 TRIALS EACH. SELECTIVE REINFORCEMENT OF LONGER THAN AVERAGE TARGET CONTACTS WAS INTRODUCED FOR ONE GROUP OF SUBJECTS DURING SESSIONS SIX AND SEVEN AND FOR ANOTHER DURING SESSIONS FOUR TO SEVEN. CONTINUOUS REINFORCEMENT OF TARGET CONTACTS WAS INTRODUCED FOR TWO OTHER GROUPS. A CONTROL GROUP RECEIVED NO REINFORCEMENT. DEPENDABLE IMPROVEMENTS IN TIME-ON-TARGET SCORES WERE OBTAINED FOR ALL FOUR SESSIONS, BUT THE SUPERIOR PERFORMANCES WERE NOT MAINTAINED WHEN REINFORCEMENT WAS WITHDRAWN. THE RESULTS SUGGEST THAT THIS IMPROVEMENT AS A FUNCTION OF FEEDBACK WAS ATTRIBUTABLE TO MOTIVATIONAL RATHER THAN LEARNING OR INFORMATIONAL EFFECTS. THIS DOCUMENT, AD 638 015, IS AVAILABLE FROM THE CLEARINGHOUSE FOR FEDERAL SCIENTIFIC AND TECHNICAL INFORMATION, SPRINGFIELD, VA. 22151. MICROFICHE $.65. HARDCOPY $3.00. 24 PAGES. (AUTHOR)