In my previous research [1], [2], I primarily focused on the acoustic features of speech. While changes in these acoustic features can be indicative of disruptions in both higher-level and lower-level processes, they offer limited access to higher-level processes. As a result, I have expanded the scope of my research in two significant ways.

Firstly, I have broadened my focus from acoustic features to encompass higher-level processes that play a crucial role in speech production. Specifically, I am conducting semantic tasks (Verbal Fluency), syntactic tasks (Word Ordering task), and phonological speech tasks (Word/Nonword Reading) to observe and analyze each of these functions during speech production.

Secondly, I have set out to investigate the neural correlates associated with speech production and how these neural mechanisms may be impacted by AD. In particular, I am collecting functional neuroimaging data using fNIRS (functional near-infrared spectroscopy), a method known for its comparative robustness to motion artifacts that are inevitable during speech production. 

This research aims to provide a comprehensive understanding of the neural mechanisms responsible for the higher-level processes involved in speech production.