This lecture covers the design and applications of miniaturized CMOS interfaces for neural recording, focusing on technologies such as Utah arrays, Michigan probes, and Neuropixels. It discusses the spatial and temporal resolution of neural recording techniques like EEG, ECOG, and LFPs, as well as the advantages of ECOG over EEG. The lecture also delves into spike sorting methods and the circuit block diagram of a neural interface, highlighting the importance of wireless neural-interface-on-chip systems.