Literature
For multi-media material on sensory systems
SensesWeb, which has been created by Tutis Vilis, contains fantastic animations - at a high level(!) - off all sensory systems, as well as the corresponding PDF-Files, and additional further links.
For the underlying biology
E. R. Kandel, J. H. Schwartz, and T. M. Jessell. Principles of Neural Science,
McGraw-Hill, 2000 [ISBN: 0838577016 (Hardcover), oder 0071120009 (int stud ed)]
For an Introduction to Control System
DA Robinson has provided a fantastic introduction to control systems.
Based on his lecture, we have put together an Introduction to Feecback Control Systems (846 kB).