Submission 419
A Storage-Retrieval Extension of the Two-High-Threshold Multinomial Model of Source Monitoring
SymposiumTalk-01
Presented by: Beatrice G. Kuhlmann
Source attributions, such as judging who told you something, involve item memory, source memory, and guessing processes. The two-high-threshold multinomial model of source monitoring (2HTSM; Bayen, Murnane, & Erdfelder, 1996) enables the separate measurement of these processes. However, its memory parameters do not separate storage and retrieval. In turn, lower source memory probabilities (2HTSM parameter d) may stem from failed source storage and/or failed source retrieval. Applying our novel test paradigm, where the standard source monitoring test is complemented by a source recognition test with reinstatement of source features from the study phase (Symeonidou & Kuhlmann, 2021), we propose a tailored extension of the 2HTSM to separately measure the probabilities of source storage (new parameter ds) and source retrieval (new parameter dr). In an experiment with N = 108 younger adults using words as items presented by two female speakers (source features: name + picture + voice) as sources, we show that this model fits empirical data well. Further crucial, targeted manipulations of storage (repetition at study) and retrieval (partial reinstatement of the speaker’s name + picture but not voice in the first test) selectively influenced the source storage and retrieval parameter, respectively, validating their psychological interpretation. In addition, we will present an overview of applications of this model to the study of source forgetting and age-related deficits in source memory.