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What do graded effects of semantic transparency reveal about morphological processing?

Laurie Beth Feldman1, Emily G Soltano, Matthew J Pastizzo

  • 1University of Albany, State University of New York, 12222, USA. lf503@albany.edu

Brain and Language
|June 3, 2004
PubMed
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Semantic transparency aids word recognition, especially with longer processing times. This effect is stronger for words with larger base morpheme families, influencing how we process related words.

Area of Science:

  • Psycholinguistics
  • Cognitive Psychology
  • Linguistics

Background:

  • Morphological facilitation explains how recognizing related word forms (e.g., 'casualness' from 'casually') is faster.
  • Semantic transparency, where the meaning of a word is clear from its parts, may influence this facilitation.
  • Previous research has explored morphological processing, but the specific role of semantic transparency requires further investigation.

Purpose of the Study:

  • To investigate how semantic transparency affects morphological facilitation in English word recognition.
  • To determine the impact of prime-target stimulus onset asynchrony (SOA) and modality on semantic transparency effects.
  • To examine if the graded effect of semantic transparency is influenced by the family size of the base morpheme.

Main Methods:

Related Experiment Videos

  • Three lexical decision experiments were conducted using visual targets (e.g., CASUALNESS).
  • Experiments varied prime modality (auditory/visual) and stimulus onset asynchrony (SOA) (48 ms, 83 ms, 250 ms).
  • Semantically transparent (e.g., CASUALLY) and opaque (e.g., CASUALTY) primes were used to assess facilitation differences.

Main Results:

  • Decision latencies were faster for targets following semantically transparent primes compared to opaque primes at a 250 ms SOA.
  • This facilitation effect was observed regardless of prime modality (auditory or visual).
  • No significant difference in latencies was found at shorter SOAs (48 ms, 83 ms) or with a forward mask.

Conclusions:

  • Semantic transparency significantly influences morphological facilitation in English word recognition, particularly at longer stimulus onset asynchronies.
  • The effect of semantic transparency is graded, with larger facilitation observed for words derived from larger base morpheme families.
  • These findings suggest that both form and meaning contribute to efficient word processing, with temporal factors playing a crucial role.