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Lexical Decision Task for Studying Written Word Recognition in Adults with and without Dementia or Mild Cognitive Impairment
Published on: June 25, 2019
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Letter-sound inconsistency impacts word learning and forgetting
1Department of Language and Cognition, Division of Psychology and Language Sciences, University College London.
Summary
Letter-sound consistency significantly impacts word learning and memory. Inconsistent words are harder to learn and more prone to forgetting, affecting various aspects of lexical knowledge.
Area of Science:
- Cognitive Psychology
- Linguistics
- Neuroscience
Background:
- Alphabetic writing systems feature systematic letter-sound mappings.
- Word consistency refers to the commonality of these letter-sound relations.
- Inconsistent words utilize less frequent letter-sound mappings.
Purpose of the Study:
- To investigate the effect of letter-sound consistency on word learning.
- To examine how consistency influences the forgetting of newly learned words.
- To analyze the impact on multiple lexical knowledge components: orthography (O), phonology (P), semantics (S), and their inter-bindings (P-O, S-O, S-P).
Main Methods:
- Eighty-six adults learned novel meanings for spoken pseudowords with either consistent or inconsistent letter-sound mappings.
- Participants read sentences containing the written forms of these pseudowords.
- Knowledge was assessed immediately after learning and after a significant delay (average 77 days).
Main Results:
- Inconsistency negatively affected the learning of phonology (P), phonology-orthography (P-O), semantics-orthography (S-O), and semantics-phonology (S-P) bindings.
- Following a delay, participants exhibited greater forgetting of phonology (P) for inconsistent words.
- Interestingly, less forgetting of semantics-phonology (S-P) bindings was observed for inconsistent words post-delay.
Conclusions:
- Lexical development is a dynamic and interactive process influenced by letter-sound consistency.
- Orthographic consistency plays a crucial role in the initial learning and long-term retention of word knowledge.
- The findings highlight the complex interplay between different knowledge systems in word acquisition and memory.
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