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Retrospective confidence rating about memory performance is affected by both retrieval fluency and non-decision time

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Abstract

Many previous studies observed that higher retrospective confidence ratings about memory performance were associated with shorter response times in memory test. Researchers often interpret response time as a measure of retrieval fluency which is an important cue utilized in confidence formation process. However, the drift diffusion model (DDM) indicates that response time in recognition memory test includes both a decision component representing memory retrieval, and a non-decision component unrelated to retrieval process. Few previous studies have investigated whether retrospective confidence in recognition test is related to the speed of both retrieval and non-decision processes. To address this question, the current study first analyzed data from six published experiments, and found that higher retrospective confidence ratings were associated with both higher drift rate (indicating retrieval fluency) and shorter non-decision time in DDM. Then we manipulated the ease of perception in two new experiments, and the results consistently indicated that difficulty in stimulus perception increased non-decision time in recognition test, which affected retrospective confidence. Furthermore, the documented results also suggest drift rate could partly account for the positive relationship between confidence and memory performance, while the reliance of confidence on non-decision time negatively affected confidence accuracy.

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Notes

  1. In the Confidence Database, there are also experiments with study materials other than single words (e.g., word pairs or pictures). However, fitting the Bayesian model to data in each experiment was computationally expensive (see below). Here we only analyzed the experiments asking participants to learn single words, which are one of the most commonly used materials in recognition test and also used in the two experiments of the current study.

  2. The transformation of confidence scale implemented here was based on a simplified assumption that participants considered the intervals between neighboring scale points were equal across the whole scale. Some studies provided evidence against this assumption (Hanczakowski, Zawadzka, et al., 2013; Zawadzka & Higham, 2015), which might be considered in future studies.

  3. Although many previous studies on metamemory use Gamma correlation to measure confidence accuracy (for a review, see Masson & Rotello 2009), there are some studies using Kendall’s τb (Dougherty et al., 2018; Robey et al., 2017). Here we use Kendall’s τb as the measure of confidence accuracy because it is easy to compute semi-partial Kendall’s τb correlation.

  4. The Kendall’s τb correlation could not be computed in hard-to-perceive condition for one participant in Experiment 1b, because all of the trials were correctly answered in recognition test.

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Acknowledgements

This study was supported by the Natural Science Foundation of China (32171045, 32000742).

Data and code availability.

Data and analysis code for the current study are available at Open Science Framework (https://osf.io/kd3f8/).

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Correspondence to Liang Luo.

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Hu, X., Yang, C. & Luo, L. Retrospective confidence rating about memory performance is affected by both retrieval fluency and non-decision time. Metacognition Learning 17, 651–681 (2022). https://doi.org/10.1007/s11409-022-09303-0

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  • DOI: https://doi.org/10.1007/s11409-022-09303-0

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