One trial learning and the suppression of interference

An experiment was made to investigate the conditions under which a subject who has learned a series of items in one order can relearn the same items in a different order in one trial. The hypothesis tested was that one-trial learning is ensured in this situation if interference between the two tasks is reduced to zero. It is shown that complete suppression of such interference, obtained by overtraining on the task which is learned first, is not sufficient to ensure the learning of the second in one trial. Comparison of the present experiment with a similar one reported by Mandler and Heinemann (1956) suggests the hypothesis that the discovery of order in the stimulus situation is necessary, in addition to the suppression of interference, if one trial learning is to occur. The relation of the results to the problem of negative transfer is also discussed.