Stance, the extent writers intervene in a text to convey their personal attitudes and assessments, has long been a topic of interest to researchers of academic communication. Less studied, however, is how stance functions in spoken discourse. This would seem to be a particularly important issue in the Three Minute Thesis presentation (3MT), a relatively new genre which captures the competitive and high pressure atmosphere of the modern academy. In these competitions doctoral students present their research using only one static slide in just 180s to a panel of judges and non-specialist audience. Using Hyland’s (2005a) model, we explore speakers’ interactional and evaluative positions in a corpus of 140 3MT presentations from the physical and social sciences. Our findings show that this monologic genre is heavily stance laden and that speakers from the hard and social sciences adopt different stance positions. Hard science students take a stance by casting doubt or asserting certainty in the reliability of information while social scientists claim an authorial self through a more visible personal presence and explicit affective commentary. Our findings have important implications for understanding academic speech genres and for EAP teachers preparing students to orally present their research.

姿态（Stance）是作者干预文本以表达其个人态度和评估的程度，长期以来一直是学术交流研究人员感兴趣的话题。但是，关于言语中姿态如何发挥作用的研究较少。在三分钟论文演示（3MT）中，这似乎是一个特别重要的问题，这是一种相对较新的体裁，它捕捉了现代学院的竞争和高压氛围。在这些竞赛中，博士生仅在180秒钟内就使用一张静态幻灯片向法官和非专业观众展示了他们的研究成果。使用Hyland（2005a）的模型，我们在来自物理和社会科学的140个3MT演讲的语料库中探讨了演讲者的互动和评估立场。我们的研究结果表明，这种单一论类型很重，而来自硬科学和社会科学领域的演讲者则采取不同的立场立场。硬科学的学生采取的态度是对信息的可靠性提出疑问或主张确定性，而社会科学家则通过更明显的个人存在和明确的情感评论来宣称自己是作者。我们的发现对理解学术演讲体裁和EAP教师准备学生进行口头陈述他们的研究具有重要意义。