Simultaneous and successive processing: An attempt at replication.

Abstract
J.P. Das and his co-workers claimed that Luria''s distinction between simultaneous and successive modes of information processing provided a more fruitful way of classifying cognitive processes than Burt and Vernon''s hierarchical models, or Jensen''s Levels I and II, or Paivio''s dual coding system of imagery and verbal mediation. Their published factor analyses were surveyed, and showed to yield only partial support for their views. A much broader battery of 14 tests was given to 91 university students, and analysed by principal factors, with varimax rotation. Two of the obtained factors involved various kinds of rote memorizing, and thus could be regarded as successive processing. Four other factors did not yield a g or general simultaneous factor, but classified the tests under: number-spatial, verbal-spatial, perceptual reasoning, and a specific digit memory factor. The 6 factors followed a multiple-factor, or a hierarchical model, rather than a dichotomous classification.

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