Pervasive influence of semantics in letter and category fluency: A multidimensional approach  

Oleh:

Schwartz, Sophie ; Baldo, Juliana ; Graves, Roger E. ; Brugger, Peter

Jenis: Article from Journal - ilmiah internasional
Dalam koleksi: Brain and Language (Full Text) vol. 87 no. 3 (2003), page 400-411.
Topik: Semantic memory; Spreading activation; Cognitive maps; Animate/inanimate; Verbal fluency; Correspondence analysis; Cluster analysis; Cognitive processes; Frontal lobe
Fulltext: 87_03_Schwartz.pdf (274.45KB)

Isi artikel

We used multidimensional statistical procedures to study semantic and lexical processes underlying word retrieval in verbalfluency performance. Forty healthy participants were given a two-choice letter task (i.e., generate items beginning with the letter 'A' or 'F', in any order) and a two-choice category task (i.e., generate animal or fruit names, in any order). Using correspondence analysis (CoA) and hierarchical clustering (HC), we found evidence of prominent semantic organization in both letter and category fluency. For example, a striking categorical segregation between animate and inanimate entities emerged during the letter task. Analysis of inter-item times revealed strong sequential priming effects in both tasks. Taken together, these results indicate that semantic facilitation is pervasive in word retrieval processes, even in the letter-fluency task, and therefore suggest that the traditional view of letter fluency as a purely phonemically based task should be revised. Finally, our findings may help explain patterns of verbal-fluency measures obtained in focal brain lesion patients.

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