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Alan D Baddeley1, Graham J Hitch1, Philip T Quinlan1

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Phonological similarity impairs immediate verbal recall. This study shows the effect stems from within-sequence similarity, not prior list interference, supporting traditional interpretations of short-term memory (STM) effects.

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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Psycholinguistics

Background:

  • Immediate serial recall of verbal material is sensitive to phonological similarity.
  • Traditional views attribute this to within-sequence similarity.
  • Engle (2007) proposed interference from prior sequences as an alternative explanation.

Purpose of the Study:

  • To test Engle's (2007) between-list proactive interference (PI) interpretation versus the within-sequence similarity effect.
  • To investigate the role of phonological similarity in short-term memory (STM) recall.
  • To examine release from PI paradigms in verbal recall.

Main Methods:

  • Used serial reconstruction to assess verbal recall.
  • Contrasted standard paradigms with conditions where phonological similarity switched between trials.
  • Manipulated vowel sounds to induce similarity switching, analogous to release from PI.

Main Results:

  • A substantial phonological similarity effect was observed in both standard and switched conditions.
  • A small advantage was found when switching across similar sequences.
  • No evidence supported the absence of a similarity effect in the initial sequence.

Conclusions:

  • Results support the within-sequence similarity interpretation over the between-list PI explanation.
  • Phonological similarity effects in immediate serial recall are primarily due to intra-sequence factors.
  • Findings contrast with classic Peterson short-term forgetting tasks, suggesting different underlying mechanisms.