Anchor, contrast, and paradoxical distance effects.

Abstract
"Eight groups of five Ss each judged seven sets of weights first by method of single stimuli and second after intervals of one or two weeks following either a very light or very heavy background or anchor stimulus. Two types of shifts in judgment due to introduction of the anchor stimuli were found . . ‥ It is shown that both classical contrast effects and paradoxical distance effects may be accounted for in terms of the adaptation-levels arising from interactions between series and background stimuli and between residuals from previous stimulation and present stimulation." (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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