Influence of the power-spectrum of the pre-stimulus EEG on the consecutive Auditory Evoked Potential in rats.
Singapore : World Scientific
InLehnertz, K.; Elger, C.E.; Arnhold, J. (ed.), Chaos in the brain. Proceedings of the 1999 Workshop, pp. 309-312
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Lehnertz, K.; Elger, C.E.; Arnhold, J. (ed.), Chaos in the brain. Proceedings of the 1999 Workshop
Evoked Potentials (EPs) are responses that appear in the EEG due to external stimulation. Findings indicate that changes in EPs can be related to changes in frequencies of the pre-stimulus EEG. Auditory EPs of rats (n=8) were measured in reaction to tone-pip stimuli (90 dB, 10.2 kHz, ISI 2s, n=1500). Trials were ranked according to the percentage of delta (1-4 Hz), theta (5-8), alpha (9-12) or beta power (13-30 Hz) in the pre-stimulus EEG. Consecutive AEPs were computed. An increase in beta and a decrease in delta resulted both in an increase in the N60 and P70 component and a decrease in the P150-200 component. These beta and delta changes have been associated with changes in arousal. The increased N60 and P70 components with increases in beta might reflect increased attention due to an increase in arousal. We found that an increase in delta activity, leads to an increase of the late-latency P150-200 component, possibly due to an increased synchronization in the EEG.
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