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On testing the strength independence assumption in retrieval-induced forgetting.
1Department of Psychology, University of Amsterdam, Nieuwe Achtergracht 129B, 1018 WS, Amsterdam, The Netherlands. j.g.w.raaijmakers@uva.nl.
Psychonomic Bulletin & Review
|January 13, 2016
Summary
Simulations show that correlations between retrieval-induced forgetting effects do not reliably distinguish between inhibitory and non-inhibitory memory accounts. These findings challenge the strength independence assumption as a key differentiator for retrieval-induced forgetting theories.
Area of Science:
- Cognitive Psychology
- Memory Research
- Computational Neuroscience
Background:
- Retrieval-induced forgetting (RIF) is a memory phenomenon where recalling specific information can impair recall of related information.
- The strength independence assumption posits that the enhancement of practiced items (RP+) is unrelated to the impairment of inhibited items (RP-).
- Previous studies used subject-level correlations between RP+ and RP- to test this assumption, favoring inhibitory accounts when no correlation was found.
Purpose of the Study:
- To investigate whether subject-level correlations in RIF paradigms effectively test the strength independence assumption.
- To evaluate if the absence of correlation supports inhibitory over non-inhibitory explanations of RIF.
- To determine if computational models can predict RIF effects and their correlations.
Main Methods:
- Large-scale simulation studies were conducted using a simplified version of the SAM (Search of Associative Memory) model.
- The simulations aimed to predict performance changes for practiced (RP+) and inhibited (RP-) items under RIF conditions.
- Correlations between RP+ and RP- measures were analyzed across simulated subjects.
Main Results:
- The SAM model simulations predicted no significant subject-level correlation between RP+ enhancement and RP- impairment.
- This lack of correlation emerged even when theoretical probabilities clearly indicated a relationship.
- Further simulations confirmed this outcome as a general property of non-inhibitory models, not specific to SAM.
Conclusions:
- Subject-level correlations in RIF paradigms are not a valid test of the strength independence assumption.
- The absence of such correlations does not provide evidence for or against inhibitory accounts of RIF.
- Future research should employ alternative methods to differentiate between inhibitory and non-inhibitory explanations of retrieval-induced forgetting.
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