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The unequal variance signal-detection model of recognition memory: Investigating the encoding variability hypothesis.

Rory W Spanton1, Christopher J Berry1

  • 1School of Psychology, University of Plymouth, Plymouth, UK.

Quarterly Journal of Experimental Psychology (2006)
|January 29, 2020
PubMed
Summary

Researchers tested the encoding variability hypothesis for recognition memory. Manipulating encoding variability did not affect memory strength variance, suggesting current methods are insufficient to test this theory.

Keywords:
Recognition memoryencoding variabilitymemory strengthold item variancesignal-detection theoryunequal variance

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Area of Science:

  • Cognitive Psychology
  • Psychophysics
  • Memory Research

Background:

  • The unequal variance signal-detection (UVSD) model is a key framework for understanding recognition memory.
  • A psychological basis for the UVSD model's unequal variance assumption, specifically the encoding variability hypothesis, remains unverified.
  • This hypothesis posits that greater variance in memory strength for old items stems from variable encoding increments.

Purpose of the Study:

  • To empirically test the encoding variability hypothesis by manipulating conditions expected to increase encoding variability.
  • To determine if increased encoding variability leads to greater memory strength variance for old items (σo) within the UVSD model.
  • To investigate the relationship between encoding variability manipulations and estimates of memory strength variance and discriminability (d').

Main Methods:

  • Three experiments were conducted manipulating encoding variability.
  • Experiment 1: Varied item presentation duration (fixed vs. variable).
  • Experiment 2: Manipulated attentional load via auditory one-back task with fixed vs. variable distractor intervals.
  • Experiment 3: Used stimuli with high vs. low word frequency variance.
  • Recognition memory performance and signal-detection parameters (σo, d') were estimated.

Main Results:

  • Attempts to manipulate encoding variability did not significantly alter estimates of σo across the three experiments.
  • The manipulations had a weak, inconsistent effect on subsequent recognition performance.
  • Estimates of σo were positively correlated with estimates of d', suggesting σo may scale with overall memory discriminability.
  • Successful manipulation of encoding variability proved difficult.

Conclusions:

  • The findings challenge the direct link proposed by the encoding variability hypothesis between manipulated encoding variability and memory strength variance.
  • Current experimental paradigms may be insufficient for effectively manipulating encoding variability in recognition memory tasks.
  • Further research is needed to refine methods for testing the encoding variability hypothesis and its implications for the UVSD model.