A system for evoking somatosensory EEG-responses in the chronically instrumented fetal lamb : T. Claesson, K.H. Hokegard, T. Olsson, J. Sellgren and K.G. Rosen, Department of Physiology, University of Göteborg and Department of Applied Electronics, School of Electrical Engineering, Chalmers University of Technology, Göteborg, Sweden.