# Xiangying Jiang, Ph.D.

Xiangying Jiang is a Lead Learning Scientist at Duolingo. She holds a Ph.D. in Applied Linguistics. Her work on Duolingo efficacy has appeared in several peer-reviewed journals.

Jun 9  [Audrey Kittredge, Ph.D.](https://blog.duolingo.com/author/audrey/)

[**연구 보고서: 듀오링고의 영상통화 기능은 학습자의 말하기 스킬을 향상시켜요**](https://blog.duolingo.com/speaking-skills-research-video-call/)

Jun 9  [Audrey Kittredge, Ph.D.](https://blog.duolingo.com/author/audrey/)

[**リサーチで検証⁠～「⁠ビ⁠デ⁠オ通⁠話⁠」で会⁠話⁠力向⁠上**](https://blog.duolingo.com/research-for-video-call-feature/)

May 26  [Audrey Kittredge, Ph.D.](https://blog.duolingo.com/author/audrey/)

[**C’est prouvé : les Appels vidéo boostent vos compétences en expression orale**](https://blog.duolingo.com/les-appels-video-rapport-de-recherche/)

May 26  [Lucy Portnoff](https://blog.duolingo.com/author/lucy/)

[**D⁠u⁠o⁠l⁠i⁠ng⁠oで中級の読解力とリスニング力を身につけられる⁠？**](https://blog.duolingo.com/intermediate-proficiency-research/)

May 21  [Audrey Kittredge, Ph.D.](https://blog.duolingo.com/author/audrey/)

[**Informe de investigación: nuestra función de videollamadas mejora las habilidades de expresión oral de los estudiantes**](https://blog.duolingo.com/informe-investigacion-videollamadas/)

May 21  [Audrey Kittredge, Ph.D.](https://blog.duolingo.com/author/audrey/)

[**Forschungen bestätigen: Unser Feature „Videocall“ verbessert die Sprechfertigkeit der Lernenden**](https://blog.duolingo.com/forschung-videocall-verbessert-sprechfertigkeit/)