Fig. 2. Comprehensive circadian rhythm recording system with hardware and software. (A) 16 channel simultaneous HKA recording system using standard A/D converter. (B) MATLAB-based user-friendly software, Circa Analysis, optimized for circadian rhythm analysis of HKA. General process of Circa Analysis software (left top). The main window of Circa Analysis program (left bottom). Both Extract window and Display window has simple interface composed of palette, edit and file list (right).
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