The Role of Input Frequency and Different Proficiency Levels on the Perception of English Nominal Suffixes by L1 Thai Learners: A Case of the Usage-Based Account

Main Article Content

Chanikarn Thatchatham
Nattama Pongpairoj

Abstract

This study investigated how input frequency (i.e., type frequency and token frequency) and proficiency levels enhanced the perception of English nominal suffixes by first language (L1) Thai learners. Based on the Usage-based Account (Tomasello, 2003), it was hypothesized that input frequency, i.e., token frequency (frequency of derived forms containing the particular suffix) and type frequency (suffix frequency), facilitates SLA. A Grammaticality Judgement Test (GJT) was administered to 60 L1 Thai learners at the intermediate and the advanced proficiency levels, 30 per group. The four frequency conditions were as follows: Condition 1 (HH) – high type and high token frequency (e.g., ‘alteration’); Condition 2 (HL) – high type and low token frequency (e.g., ‘chemist’); Condition 3 (LH) – low type and high token frequency (e.g., ‘dependence’); and Condition 4 (LL) – low type and low token frequency (e.g., ‘partnership’). The results showed significant effects of input frequency and proficiency levels. However, the interaction between them was not significant. The study also revealed that the intermediate group perceived Condition 3 (LH) most accurately, whereas Condition 1 (HH) was perceived most accurately by the advanced group. The findings supported the Usage-based Account, indicating that input frequency influenced SLA of English nominal suffixes, with token frequency having a greater impact than type frequency.

Article Details

How to Cite
Thatchatham, C., & Pongpairoj, N. (2025). The Role of Input Frequency and Different Proficiency Levels on the Perception of English Nominal Suffixes by L1 Thai Learners: A Case of the Usage-Based Account. LEARN Journal: Language Education and Acquisition Research Network, 18(1), 883–913. https://doi.org/10.70730/VDET8305
Section
Research Articles
Author Biographies

Chanikarn Thatchatham, English as an International Language, Graduate School, Chulalongkorn University, Thailand

A Ph.D. candidate in English as an International Language Program, Graduate School, Chulalongkorn University, Thailand. Her research interests include second language acquisition, morphology, corpus linguistics, and English language teaching.

Nattama Pongpairoj, English as an International Language, Graduate School, Chulalongkorn University, Thailand

An associate professor in English as an International Language Program, Graduate School, Chulalongkorn University, Thailand. Her research interests lie in second language acquisition, particularly L2 representations and cognitive processing.

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