Lecture #7 was an introduction to Reactive and Hybrid Agents
Additional material is the original paper on the subsumption architecture:
Brooks, R. A. "A Robust Layered Control System for a Mobile Robot", IEEE Journal of Robotics and Automation, Vol. 2, No. 1, March 1986, pp. 14?23; also MIT AI Memo 864, September 1985.You can download it as above, or find it on Citeseer.