This chapter summarizes our research on axonal electrical stimulations described in Part II. It presents the critical role of axonal responses in brain stimulations, discusses the high-frequency stimulation (HFS)-induced axonal block and its resulting neuronal responses, analyzes the effects of different time-varying stimulations under the situation of axonal block, and explores the potential post-stimulation effects of DBS, applications of closed-loop stimulations, and the relations between DBS and brain-computer interfaces.