INTRODUCED THE OBSERVATION TECHNIQUE FOR PROBABILITY LEARNING (PL), CHARACTERIZED BY PRESENTING OUTCOMES TO THE S WITHOUT A SIGNAL OR REQUIRING A PREDICTION RESPONSE. THIS TECHNIQUE WAS USED AS TRAINING AND WAS TESTED WITH 500 TRIALS OF TRADITIONAL PL. THE RATE OF PRESENTATION (2/SEC VS. 1 EVERY 4 SEC.) DID NOT PRODUCE DIFFERENCES IN ASYMPTOTIC RESPONDING ON TEST TRIALS. 100 OBSERVATION TRIALS APPEARED EQUIVALENT TO 100 REGULAR TRIALS. 2000 OBSERVATION TRIALS DID NOT SIGNIFICANTLY CHANGE THE ASYMPTOTIC RESPONDING. A GROUP WHICH DID NOT RECEIVE EVENTS DURING THE TEST TRIALS DID SHIFT ASYMPTOTIC RESPONDING SIGNIFICANTLY. THE ASYMPTOTE DECREASED FROM .84 TO ABOUT THE PROBABILITY OF THE REINFORCING EVENT, .81. AN ANALYSIS OF RECENCY CURVES SHOWED NO DIFFERENCES IN PROCEDURES, BUT SEQUENTIAL STATISTICS DID PRODUCE SIGNIFICANT DIFFERENCES AMONG THE VARIOUS GROUPS. (20 REF.)
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