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Related Experiment Videos

Does the previous trial affect lateralized lexical decision?

M Iacoboni1, J Rayman, E Zaidel

  • 1Department of Neurology, UCLA School of Medicine, University of California 90095, USA. iacoboni@loni.ucla.edu

Neuropsychologia
|January 1, 1997
PubMed
Summary
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Previous trial errors improve accuracy in the left visual field (LVF). Word recognition in the LVF is better after a previous LVF word target, suggesting prior trial effects influence lexical decisions.

Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Experimental Psychology

Background:

  • Understanding trial-to-trial variability is crucial for interpreting cognitive task performance.
  • Previous research has explored various factors influencing response accuracy and latency.
  • Lateralized lexical decision tasks (LLDT) are used to study hemispheric processing differences.

Purpose of the Study:

  • To investigate how variables from a previous trial impact performance in the current trial of a lexical decision task.
  • To examine the influence of previous trial correctness, visual hemifield, wordness, and presentation mode on current trial performance.
  • To explore the presence and nature of "negative priming" in lateralized lexical decision tasks.

Main Methods:

  • Participants performed a lexical decision task with unilateral or bilateral stimulus presentation.

Related Experiment Videos

  • Key variables manipulated included correctness, visual hemifield (left/right), wordness (word/nonword), and presentation mode (unilateral/bilateral) of the previous trial.
  • Response accuracy and reaction time were measured for the current trial.

    • Main Results:

    • An incorrect response in the previous trial enhanced accuracy in the current trial, but only for stimuli presented in the left visual field (LVF).
    • Previous LVF targets led to faster correct responses to subsequent LVF targets.
    • LVF word recognition was more accurate when the preceding LVF target was a word compared to a nonword.
    • No evidence of negative priming was found; target processing was not affected by the response category of the previous trial's unattended stimulus.

    Conclusions:

    • Previous trial effects in lateralized lexical decision tasks are more pronounced for word decisions in the LVF.
    • These findings may explain inconsistencies in the wordness effect observed in previous LVF lateralized lexical decision experiments.
    • Researchers conducting behavioral laterality experiments should consider using randomized sequences that vary across subjects to mitigate confounding previous trial effects.