Models of EFL Learners’ Vocabulary Development: Spreading Activation vs. Hierarchical Network Model

Document Type: Original Article

Authors

1 English, Basic Sciences, Imam Ali University

2 MA in TEFL, Faculty of Persian Literature and Foreign Languages, Islamic Azad University, South Tehran Branch, Iran

Abstract

Semantic network approaches view organization or representation of internal lexicon in the form of either spreading or hierarchical system identified, respectively, as Spreading Activation Model (SAM) and Hi- erarchical Network Model (HNM). However, the validity of either model is amongst the intact issues in the literature which can be studied through basing the instruction compatible with the principles of each model. In a bid to fill this gap, this study was designed to empirically verify the effectiveness of SAM compared to HNM in both developing and retention rate of vocabulary knowledge. To this end, 67 Ira- nian EFL learners were divided into two experimental groups (34 and 33) and one was exposed to HNM- based while the other to SAM-based vocabulary instruction for 10 sessions. In the light of group- comparison experimental design, the participants' both immediate achievement and long-term storage were measured through an immediate and a delayed post-tests, respectively. The parametric statistical analyses showed that the group being exposed to HNM-based instruction outperformed the other group in both the immediate and delayed post-tests. The findings bear two distinct messages: yielding support to more validity of HNM as a model of internal lexicon organization and supporting the educational implica- tions of cognitively compatible instruction of language components.

Keywords


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