A variety of different memory tasks have revealed that not all items in a list were equally likely to be remembered. For instance, a very common method used to study memory was the free recall experiment. In this kind of experiment, subjects are presented a list of to-be-remembered items, which could be digits, words, or nonsense syllables. At the end of the list, subjects are given a set period of time (e.g., two minutes) in which they write down as many of the presented items as they recall. They can write these items down in any order, which is why the method is called free recall. While the subject can recall items in any order that he or she pleases, the experimenter generally plots the probability that an item is correctly recalled as a function of its position in the list, producing what is known as a serial position curve (see Figure 5-1). All things being equal, serial position curves routinely demonstrate, regardless of list length, a primacy effect in which the first three or four items in the list are better recalled than the middle items of the list. The scenario for free recall set out in Laming (2009) is developed to provide models for the serial position curves from 5 selected sets of data, for final free recall, and for multitrial free recall. The 5 sets of data reflect the effects of rate of presentation, length of list, delay of recall. This is known as serial position effect. The improved recall of words at the beginning of the list is called the primary effect; that at the end of the list, the recency effect. This recency effect exists even when the list is lengthened to 40 words. Serial position curves also typically reveal a recency effect in which the last three or four items in the list are also better recalled than the middle items (e.g., Glanzer & Cunitz, 1966, Exp. 1; Postman & Phillips, 1965). References: • Glanzer, M., & Cunitz, A. Two storage mechanisms in free recall. Journal of Verbal Learning and Verbal Behavior, 5(4), 351-360. • Postman, L., & Phillips, L. Short-term temporal changes in free recall. Quarterly journal of experimental psychology, 17, 132-138. (Revised October 2010).
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Март 2019
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