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201162 https://hdl.handle.net/2286/R.2.N.201162 http://rightsstatements.org/vocab/InC/1.0/ All Rights Reserved 2025 2027-05-01T10:58:24 64 pages Masters Thesis Academic theses en Kang, Jihee Daliri, Ayoub Rogalsky, Corianne Merrikhiahangarkolaee, Yaser Arizona State University Partial requirement for: M.S., Arizona State University, 2025 Field of study: Speech and Hearing Science Decision-making has been a topic of interest in various fields and areas. Among a range of research topics, decision making under uncertainty and under time pressure has its significant implications in our daily life. Previous studies have investigated people’s performance tendency and decision-making processes on the task where they are asked to change their movement plans suddenly, without knowing it in advance. These topics have been studied in the past, yet it was limited to the field of motor movement and works on speech domain remains underdeveloped. To fill in this research gap, current study looked at the topic in the field of speech. The purpose of this study was to gain understanding on how people would decide to react when a sudden change of speech planning is required. Would they ignore the suddenly presented change and decide to produce speech response using the initially created speech plan, or would they decide to build a new speech plan? During these processes, would their speech responses show different speech characteristics compared to those response when the target words did not change suddenly? The experiment collected speech responses of participants in two types of conditions, Non-switch and Switch trials. In the Non-switch trial, the target word that participants have to produce did not change. On the other hand, in the Switch trials the ultimate target word that participants have to produce suddenly changed and thus wasdifferent from the initially presented word, so participants were required to quickly change their speech plan and produce new target word based on their new speech plan. I measured and analyzed participants’ reaction time in each of the experiment conditions, error rate in 8 distinct categories, and formants of the vowels in their responses. The results from this study showed that participants tended to make errors in the Switch trials, with different types of error categories for the four experiment conditions. Reaction time decreased as the experiment proceeded, as the participants completed subsequent blocks. Formants of the vowels demonstrated differences in between the ones in Switch and Non-switch conditions. Neurosciences Decision-Making Hearing Neuroscience Speech uncertainty Investigating Decision-Making Processes in Speech Production