Fig. 3.

EEG rack system. Each rack houses 4 cages, two on each shelf. Every 2 racks (8 cages) are monitored by one EEG recorder. We built a rack system that does not contain metal or other conductive material which provides the simplest and most efficient technique to electrically isolate rats from each other and from environmental sources of electricity. This has markedly contributed to minimizing electrical artifact, which is a challenge commonly faced when simultaneously recording multiple animals