Abstract
Two experiments are reported that test the hypothesis that the serial position effect in comparative judgment of ordinal position in arbitrary serial lists results from differential memory or associative strength among list items. The serial position effect in comparative judgment is typically a pattern in which pairs that contain a term from one of the two extremes of the list are processed faster and more accurately than pairs that contain no end terms. The experiments show that a new term added to either the end or the middle of a well-practiced fourterm series behaves almost immediately like the end or central term, respectively, of a well-practiced five-term series. Furthermore, when the added term is removed, the list reverts immediately to the position effect obtained in a four-term series. Theories that explain the position effect by differential build-up of item strength or of interitem associative strength over practice cannot explain these effects. We propose instead that learning of a serial list is accomplished by assigning list members to positions in a general-purpose linear order schema and that subjects can make these assignments rapidly and flexibly.
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This research was supported partly by NSF Grant BNS 78-17442 and partly by NIH Grant 1 R01 MH33279-01, both to W. P. Banks.
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Banks, W.P., White, H. & Mermelstein, R. Position effects in comparative judgments of serial order: List structure vs. differential strength. Memory & Cognition 8, 623–630 (1980). https://doi.org/10.3758/BF03213782
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DOI: https://doi.org/10.3758/BF03213782