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Implicit-statistical learning in aphasia and its relation to lesion location.

Veronika Vadinova1, Olga Buivolova2, Olga Dragoy3

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Neuropsychologia
|September 5, 2020
PubMed
Summary

Implicit-statistical learning (ISL) mechanisms are impaired in people with aphasia (PWA), regardless of lesion location. ISL deficits correlate with syntactic, not lexical, impairments, suggesting ISL’s role in language processing.

Keywords:
AphasiaGrammarImplicit learningStatistical learningStrokeSyntax

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Linguistics

Background:

  • Implicit-statistical learning (ISL) research explores domain-general mechanisms in linguistic processing.
  • Aphasia, resulting from left hemisphere brain damage, often involves syntactic deficits.
  • Previous research linked frontal lobe lesions in aphasia to impaired ISL, but posterior lesions were understudied.

Purpose of the Study:

  • To investigate the anatomical distribution of ISL deficits in aphasia.
  • To determine if ISL impairments correlate with specific linguistic deficits in people with aphasia (PWA).
  • To examine the role of ISL in syntactic processing and its potential domain-general nature.

Main Methods:

  • Tested 13 PWA (5 frontal, 8 posterior lesions) and 11 controls on a visual statistical learning (VSL) task.
  • Analyzed reaction times from the VSL task using linear mixed-effects models.
  • Assessed correlations between VSL performance and linguistic task outcomes in PWA.

Main Results:

  • ISL mechanisms were impaired in PWA with both frontal and posterior lesions, refuting the anatomical hypothesis.
  • ISL deficits were present but not absent in aphasia.
  • A significant correlation was found between ISL impairment and syntactic deficits, but not lexical deficits.

Conclusions:

  • ISL mechanisms are vulnerable in aphasia, potentially due to broader cognitive issues or posterior brain involvement.
  • ISL plays a role in syntactic processing, supporting its involvement in language.
  • Findings have implications for understanding ISL domain-specificity and for developing implicit language therapies for aphasia.