The role of biomechanics in enhancing spoken English proficiency through articulation and gesture analysis

This study investigates the biomechanical relationship between Articulation Clarity (AC) and gesture use in spoken English, focusing on how these elements contribute to Speech Fluency (SF), vocabulary retention, and comprehension. The research explores how the integration of articulation and gestures impacts communication effectiveness in English learners at varying proficiency levels. 78 participants were recruited, comprising intermediate and advanced English learners. The study employed a comprehensive biomechanical analysis using motion capture, acoustic analysis, and electromyography (EMG) to measure articulator movements (tongue, lips, jaw) and gesture dynamics (amplitude and frequency). The coordination between gesture and speech was analyzed through gesture-speech synchronization, while the effect of gestures on vocabulary retention and comprehension was assessed using Regression Analysis (RA). The findings revealed that advanced learners demonstrated significantly higher articulation clarity (mean amplitude of 67.9 dB) and more excellent Gesture Frequency (GF) (3.05 gestures/second) compared to intermediate learners. ANOVA results showed significant differences between proficiency levels in AC (p = 0.042) and SF (p = 0.008). RA indicated that gesture use positively impacted vocabulary retention (GF coefficient B = 2.15, p = 0.001) and comprehension (GF coefficient B = 1.98, p = 0.003). A moderate correlation was found between gesture amplitude and SF (r = 0.69) and AC (r = 0.54). Muscle activation data indicated increased effort during tasks with gestures, with significant differences in facial and upper limb muscle activation (p < 0.01). The study concludes that articulation and gestures are critical in enhancing SF, clarity, and comprehension in English learners. Advanced learners exhibit better biomechanical coordination between speech and gestures, increasing their proficiency. Gesture use supports vocabulary retention and reinforces speech articulation, making it a valuable tool in language learning. These findings suggest that integrating biomechanical training for articulation and gestures could improve spoken English proficiency, especially for second-language learners.