Fig. 5
From: Automatic sleep stage classification based on subcutaneous EEG in patients with epilepsy
Illustration of the subcutaneous recordings system. Left: illustration of the implant and the beta-version of the external device used to collect data in the present study. The placement of the Proximal (P), Center (C) and Distal (D) electrodes are indicated by the letters. The length of the implant is approximately 11 cm. Right: illustration of the commercially available device. The device is worn under the shirt and secured in place by a magnet (gray circle)