The emergence of virtual avatars provides innovative opportunities for remote conferencing, education, and more. Our study investigates how the realism of avatars, used by native English speakers, impacts the anxiety levels of English as a Second Language (ESL) speakers during interactions. ESL participants engaged in conversations with native English speakers represented through cartoonish avatars, realistic-like avatars, or actual video streams. We measured both the ESL speakers' self-reported anxiety and their physiological indicators of anxiety. Our findings show that interactions with native speakers using cartoonish avatars or direct video lead to reduced anxiety levels among ESL participants. However, interactions with avatars that closely resemble humans heightened these anxieties. These insights are critically important for the design and application of virtual avatars, especially in addressing cross-cultural communication barriers and enhancing user experience.

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