f numbers is inversely proportional to the number of intervening items between the first presentation and repetition" (Buschke, p. 229).
Buschke, a clinical psychologist experimental-minded, used what was called the missing scan method in his 1960 experiment. In this experiment, Buschke presented the subject with one to 16 digits and asked that he recall all of them without regard to order of presentation. He found that the subject recalled correctly 5.5 items. Buschke then presented another set of random numbers, removed these, and then displayed all but one of them, at which time he asked the subject to recall the missing digit. In this case, the subject recalled 8.5 of the items. In the 1962 experiment, Buschke compared the storage ability of character of the visual and auditory channels. The experiment to be described is a modification of this second Buschke experiment, as modified by Bieder and Szafran.
Several differences among the three experiments follow: Buschke used a projector and tape-recorder, Bieder and Szafran used cards and face-to-face presentation, the experimenters in this study used cards and a tape recorder; the first two used a control group, but the latter did not; Buschke did not vary the information content, but the others did. As stated earlier, the results of the experiment to be described are to be compared to the results of the Bieder-Szafran experiment. Following their example, a single-digit series with an information content of 3.3 bits, a single- and a double-digit series with an information content of 6.45 bits per stimulus were presented to each subject. All three of the experiments under discussion at present involved a matching process in the central nervous system, calling for registration, recall and shifting of information. In the Bieder-Szafran experiment, cross-modal
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