Behaviour-dependent variability of potentials in the somatosensory cortex evoked by stimulation of the trigeminal nuclei in freely moving rats
Rehnig, H.P.; Brankack, J.; Klingberg, F.
Biomedica Biochimica Acta 46(4): 297-300
1987
ISSN/ISBN: 0232-766X PMID: 3632654 Document Number: 288597
Nine hooded rats with chronically implanted epidural recording electrodes on the right primary somatosensory cortex, the olfactory bulb and bipolar stimulating electrodes in the left ponto-mesencephalic trigeminal nuclei and parabrachial region were investigated during different patterns of spontaneous behavior. The early positive-negative component of the TNEP with peak times P5 and N11 (ms) appeared about 1 ms earlier than after tooth pulp stimulation. The amplitude P5-N11 was slightly increased during drowsiness, decreased during slow wave sleep and was strongly decreased in behavioral patterns with movements, always compared with relaxed wakefulness. The behavior-dependent changes of cortical EP to stimulation of trigeminal nuclei (TNEP) were analogous to those after tooth pulp stimulation.