Figure 3From: Gemvid, an open source, modular, automated activity recording system for rats using digital video Spectral analysis of two periods of data acquisition with a metronome set up at 52 oscillations per minutes = 0.8667 Hz, in a continuous experiment. Left: spectrogram from data acquired at 9:00 hr. Right: spectrogram from data acquired at 18:50 hr.Back to article page