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Stimulus orientation and the first-letter advantage.

Michele Scaltritti1, Stéphane Dufau2, Jonathan Grainger2

  • 1Dipartimento di Psicologia e Scienze Cognitive, Università degli Studi di Trento, Corso Bettini 84, I-38068 Rovereto, TN, Italy.

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Summary

This study investigated how stimulus orientation affects memory for letter and symbol strings. Results show orientation impacts the first-letter advantage, supporting letter-specific processing but also indicating a role for general attentional biases.

Keywords:
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Area of Science:

  • Cognitive Psychology
  • Visual Perception
  • Human Memory

Background:

  • The first-letter advantage describes a phenomenon where the initial item in a string is recalled better than subsequent items.
  • Prior research offers competing explanations: letter-specific processing for horizontal strings versus general attentional biases.
  • Understanding this advantage is crucial for models of visual processing and memory encoding.

Purpose of the Study:

  • To investigate the influence of stimulus orientation (horizontal vs. vertical) on serial position functions.
  • To test competing theories explaining the first-letter advantage in memory recall.
  • To differentiate between letter-specific processing and attentional bias accounts.

Main Methods:

  • A post-cued partial report experiment was conducted using strings of five consonants or five symbols.
  • Stimuli were presented in either horizontal or vertical orientations.
  • Serial position functions were analyzed across stimulus types and orientations.

Main Results:

  • A significant three-way interaction was found between stimulus type, serial position, and orientation.
  • A greater first-position advantage for letters over symbols occurred in horizontal compared to vertical presentation.
  • A first-position advantage for letters persisted in the vertical condition.

Conclusions:

  • Results support the letter-specific processing account for the first-letter advantage, particularly in horizontal arrangements.
  • Visual complexity differences between letters and symbols appear to play a minor role.
  • The persistent advantage in vertical orientation suggests attentional biases also contribute independently of orientation.