About Perceptual Control Theory (PCT), some history, status, and what you will experience when studying PCT. Highlights from an introductory essay William T. (Bill) Powers wrote in May, 1980
Joseph W. Barter, Suellen Li, Tatyana Sukharnikova, Mark A. Rossi, Ryan A. Bartholomew, and Henry H. Yin (2015) https://www.researchgate.net/profile/Mark-Rossi-5/publication/272165203_Basal_Ganglia_Outputs_Map_Instantaneous_Position_Coordinates_during_Behavior/links/54dcbf590cf25b09b912c829/Basal-Ganglia-Outputs-Map-Instantaneous-Position-Coordinates-during-Behavior.pdf
The Study of Living Control Systems, a handbook of research methodology in psychology by Richard S. Marken is available from Cambridge University Press and from booksellers (February 2021).