Memory Span As Structural Aspect
A structural definition of memory span is difficult to give, for one immediately is faced by the distinctions between the prerequisites for memory span, and the actual processes involved. "Associability” is required in memory span. This term refers to the ability of the subject to group the series of elements together: to perceive relationships among the series in order to better reproduce them. Still another process involved in memory span is that of imagery. The subject, in order to be able to reproduce the series presented, must be able to image the series. The actual reproducing of the series of stimuli involves the process of memory. If the individual possessed no memory at all, reproduction of the series would be impossible. It is also known that memory span and memory are different in the length of time over which reproduction is possible. Memory span is transitory; memory is fairly permanent. In addition, the amount of material involved in memory span is ordinarily much less than the amount of material involved in memory. Reproduction of the series also involves certain other "reproduction factors," such as language ability and arithmetical proficiency.
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