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Related Experiment Video

Updated: Jun 3, 2026

Using Practice Testing, Public Speaking, and Source Monitoring to Examine the Influences of Learning Strategies and Stress on Episodic Memory
07:59

Using Practice Testing, Public Speaking, and Source Monitoring to Examine the Influences of Learning Strategies and Stress on Episodic Memory

Published on: June 14, 2019

Contextual Variability in Free Recall.

Lynn J Lohnas1, Sean M Polyn, Michael J Kahana

  • 1Neuroscience Graduate Group, University of Pennsylvania.

Journal of Memory and Language
|March 8, 2011
PubMed
Summary
This summary is machine-generated.

Contextual variability theory suggests spaced memories are easier to recall. Replicating past research, this study found evidence supporting this theory, indicating spaced learning enhances episodic memory retrieval.

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Last Updated: Jun 3, 2026

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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Memory Research

Background:

  • Contextual-variability theory posits that memory encoding is tied to specific environmental contexts.
  • This theory predicts that items studied further apart in time (spaced) will have more distinct contextual associations than massed items.
  • Previous research by Ross and Landauer (1978) failed to support this theory, suggesting spaced retrieval cues might not be more unique.

Purpose of the Study:

  • To re-evaluate contextual-variability theory in episodic memory.
  • To determine if item spacing influences recall probability due to distinct contextual states.
  • To address the contradictory findings of Ross and Landauer (1978).

Main Methods:

  • Replication of the Ross and Landauer (1978) analysis.
  • Analysis of six independent episodic memory recall datasets.
  • Statistical examination of recall probability as a function of item spacing.

Main Results:

  • All six analyzed datasets demonstrated a pattern of results consistent with contextual-variability theory.
  • Increased spacing between studied items correlated with enhanced recall probability, contrary to previous findings.
  • The unique retrieval cues associated with spaced items appear to facilitate memory access.

Conclusions:

  • The findings provide robust support for contextual-variability theories of episodic memory.
  • This study challenges the negative conclusions drawn by Ross and Landauer (1978).
  • Spaced learning enhances memory retrieval by leveraging distinct contextual states.