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A Semantic Priming Event-related Potential ERP Task to Study Lexico-semantic and Visuo-semantic Processing in Autism Spectrum Disorder
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Is the LAN effect in morphosyntactic processing an ERP artifact?

Sendy Caffarra1, Martha Mendoza1, Doug Davidson1

  • 1BCBL, Basque Center on Cognition, Brain and Language, Mikeletegi 69, 20009 Donostia, Spain.

Brain and Language
|February 8, 2019
PubMed
Summary
This summary is machine-generated.

The left anterior negativity (LAN) ERP component may exist, as analyses across participants, items, and trials confirm its presence in some cases, challenging prior doubts about its validity in morphosyntactic processing.

Keywords:
ERPIndividual differencesLANMorphosyntax

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Area of Science:

  • Cognitive Neuroscience
  • Psycholinguistics
  • Electrophysiology

Background:

  • The Left Anterior Negativity (LAN) is an ERP component linked to morphosyntactic processing.
  • Recent studies have questioned the existence and nature of the LAN effect.
  • Potential overlap with N400 and P600 components complicates interpretation.

Purpose of the Study:

  • To investigate the reality of the LAN effect in response to local agreement violations.
  • To determine if the grand average LAN is an artifact of overlapping ERPs (N400, P600).
  • To analyze the LAN effect at subject, item, and trial levels.

Main Methods:

  • Analysis of event-related potentials (ERPs) between 300 and 500 ms.
  • By-subject, by-item, and by-trial analyses were conducted.
  • Mixed-linear models were employed to assess effect sizes and variability.

Main Results:

  • A LAN effect was observed in 55% of participants, 46% of items, and 49% of trials.
  • Biphasic LAN-P600 responses were frequently noted.
  • Mixed-linear models indicated that subject variability did not diminish the LAN effect size.

Conclusions:

  • The grand average LAN effect can reflect genuine brain responses at individual levels (subject, item, trial).
  • The findings support the existence of the LAN component in specific instances.
  • This research clarifies the nature of the LAN effect in morphosyntactic processing.