Abstract:This paper describes a newly designed measurement system which drives a recording electrode and analyzes the neural activity in the cerebral cortex. The system is composed of two main parts. One part, for electrode positioning, is to control the recording electrode in three-dimensions, and the other part, for data collection and processing, is to perform the signal processing of neural potentials into a digital format, the storage of experimental data, and its mathematical analysis. The system was designed to analyze slow wave-form activity such as evoked potentials and electroencephalograms (EEG). The measurement system was utilized in the experiments to record the distribution of evoked potentials in the somatosensory cortical oral area of the cat, and it was able to position the recording electrode accurately in the cerebral cortex and to reduce the time for the experiment and data processing to less than 1/10.