Word-length effects in immediate memory: Overwriting trace decay theory.

Area of Science:

• Cognitive Psychology
• Neuroscience
• Memory Research

Background:

• The word-length effect, where longer words are harder to recall, is traditionally explained by time-based decay in working memory.
• Existing models often incorporate articulatory loop structures and decay mechanisms to account for memory limitations.

Purpose of the Study:

• To investigate the word-length effect in memory recall.
• To propose and test an alternative explanation for the word-length effect using a feature model.
• To challenge the necessity of time-based decay in working memory theories.

Main Methods:

• Utilized an extended version of Nairne's (1990) feature model.
• Simulated memory recall for items of varying lengths, controlling for frequency, syllables, and phonemes.
• Compared model predictions with empirical findings on modality, phonological similarity, articulatory suppression, and serial position effects.

Main Results:

• The feature model successfully replicated the linear relationship between memory span and pronunciation rate.
• The model predicted memory performance without incorporating time-based decay.
• The model accurately accounted for various factors influencing memory recall, including modality and phonological similarity.

Conclusions:

• Word-length effects in memory do not necessitate time-based decay mechanisms in working memory.
• A feature-based approach provides a viable alternative explanation for the word-length effect.
• Rethinking the role of decay is crucial for advancing memory theories.