Effect of lateral hypothalmic lesion on sleep-waking pattern and EEG power spectra in the rat

• Authors: E. Jurkowlaniec , T. Pracki , W. Trojniar , J. Tokarski
• Languages of publication: EN

Abstracts

EN

Bilateral, electrolytic lesion of the lateral hypothalamus (LH) in rats produces hyposomnia and qualitative EEG changes which are difficult to assess by convencional visual inspections of electroencephalograms. In the present study the spectral analysis of EEG was applied in LH-lesioned rats and confronted with standart visual scoring method. One-hour samples of hippocampal and cortical EEG were taken from the light part of the circadian cycle before and after electrolytic or sham LH damage. In half of the LH-lesioned rats a power spectral analysis was performed using a Fast Fourier Transform routine at 1 Hz bands from 0.5 to 25 Hz; in the other half, as well as in the sham-lesioned group, EEG records were visually scored for the amount of waking, slow wave sleep and paradoxical sleep. Significant hyposomnia effects were found in LH-lesioned rats. Power spectral analysis of hippocampal EEG revealed a significant increase in power density at 4-6 Hz and reduction at 7-10, 14-17, 19-22 and 23-24 Hz. In neocortical EEG there was a significant increase in power density at 5-6 Hz band and reduction at 7-8 Hz. The results are discussed in the context of the effects of selective desrtuction of the specific neurotransmitter systems occupying the LH area.

Keywords

EN

EEG; HYPOSOMNIA; POWER SPECTRAL ANALYSIS

Discipline

• EXPERIMENTAL_BIOLOGY_&_MEDICINE: EXPERIMENTAL BIOLOGY & MEDICINE

• Publisher: Marceli Nencki Institute of Experimental Biology, Polish Academy of Sciences
• Journal: Acta Neurobiologiae Experimentalis
• Year: 1996
• Volume: 56
• Issue: 1
• Pages: 249-253

Contributors

author

E. Jurkowlaniec

author

T. Pracki

author

W. Trojniar

author

J. Tokarski

• Document Type: proceeding
• Publication order reference: E.Jurkowlaniec