Meny

Du är här

Atypical associations to abstract words in Broca's aphasia

Publiceringsår: 2012
Språk: Engelska
Sidor: 1068-1072
Publikation/Tidskrift/Serie: Cortex
Volym: 48
Nummer: 8
Dokumenttyp: Artikel
Förlag: Elsevier

Sammanfattning

Introduction
Left frontal brain lesions are known to give rise to aphasia and impaired word associations. These associations have previously been difficult to analyze. We used a semantic space method to investigate associations to cue words. The degree of abstractness of the generated words and semantic similarity to the cue words were measured.
Method
Three subjects diagnosed with Broca’s aphasia and twelve control subjects associated freely to cue words. Results were evaluated with latent semantic analysis (LSA) applied to the Swedish Parole corpus.
Results
The aphasic subjects could be clearly distinguished from controls by a lower degree of abstractness in the words they generated. The aphasic group’s associations showed a negative correlation between semantic similarity to cue word and abstractness of cue word.
Conclusions
By developing novel semantic measures, we showed that Broca’s aphasic subjects’ word production was characterized by a low degree of abstractness and low degree of coherence in associations to abstract cue words. The results support models where meanings of concrete words are represented in neural networks involving perceptual and motor areas, whereas the meaning of abstract words is more dependent on connections to other word forms in the left frontal region. Semantic spaces can be used in future developments of evaluative tools for both diagnosis and research purposes.

Disputation

Nyckelord

  • Medicine and Health Sciences
  • Languages and Literatures
  • aphasia
  • latent semantic analysis
  • LSA
  • concreteness
  • abstractness

Övriga

  • Vetenskapsrådet
Published
  • Cognition, Communication and Learning
  • Abstrakta, emotionella och konkreta ord i det mentala lexikonet
Yes
  • ISSN: 0010-9452

Box 117, 221 00 LUND
Telefon 046-222 00 00 (växel)
Telefax 046-222 47 20
lu [at] lu [dot] se

Fakturaadress: Box 188, 221 00 LUND
Organisationsnummer: 202100-3211
Om webbplatsen