Why Some Gestures Work Better than Others: Toward a Model of Gesture-Supported Vocabulary Learning

Abstract Gesture has emerged as a powerful multimodal tool in vocabulary acquisition, with converging behavioral and neuroscientific evidence for its facilitative role in second language (L2) vocabulary learning. Yet in both instructional practice and experimental research, gestures are often treated as relatively homogeneous, despite systematic variation in their characteristics and implementation that may contribute to heterogeneous learning outcomes. In this article, we examine theoretically relevant sources of this variation and argue that gesture characteristics should be considered explicitly in L2 vocabulary instruction and research. Drawing on theoretical and empirical research on gesture-supported vocabulary learning, we identify seven dimensions hypothesized to be relevant to the mnemonic contribution of instructional gestures: iconicity, sensorimotor imagery potential, motional salience, emotional salience fit, gesture complexity fit, cultural familiarity, and enactment potential. These dimensions capture properties of instructional gestures and their relationships with the target lexical item and learning context. They are not assumed to be statistically independent or to contribute equally or additively to learning. We integrate these dimensions in the Gesture Memory Support Model (GMSM), a preliminary theoretical and operational framework for systematically characterizing instructional gestures. Rather than combining dimension ratings into an overall measure of gesture effectiveness, the GMSM retains them as a multidimensional profile. Grounded primarily in L2 research, the framework supports stimulus characterization, experimental design, and hypothesis generation without assuming that its potential applicability is restricted to L2 vocabulary learning. The framework distinguishes gesture characteristics from learner-level cognitive mechanisms and implementation conditions, such as gesture–speech temporal alignment and whether gestures are observed or actively produced. At its present stage of development, the GMSM should be regarded as a framework for characterization and hypothesis generation rather than as an empirically validated diagnostic or predictive instrument. Future research will be required to establish the reliability and empirical distinctiveness of its dimensions and determine their individual and interactive relationships with vocabulary-learning outcomes.