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Results for “Cortical Synchronization”

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At least 1,531 records · Page 85Linked to original sources
PubMed1985

[Interhemispheric phase relations in children of early school age].

The cross-correlation method was used to measure interhemisphere phase differences over four areas of the brain in 22 healthy children aged between 7 and 10 years. Apart from defining normal values, the authors describe age-dependent characteristics and changes that take place as a result of mental stress.

Cerebral Cortex↗
PubMed1977

[Spontaneous and evoked EEG-activity during one-second light-stimulation (author's transl)].

EEG data were recorded in 13 students during one-second light-stimulation with eyes closed and sometimes eyes opened, from central and occipital regions. The background EEG was computer-analyzed in the alpha-band using the power time course where a short decrease in power was indicative of a phasic desynchronization of the rhythmic activity within the alpha-band. The maximal desynchronization was observed in the occipital region independent of eyes-opened or eyes-closed conditions. With eyes closed a reinforced power decrease was found 0.25-0.5 sec after the on- and offset of light-stimulation, which was interpreted as "on"- and "off"- effect of the background EEG activity. Parallel with the on- and off-effect a slow potential change occurred in the evoked responses. The behaviour of the background activity during 1 sec light-stimulation was intramodality specific in contrast to the evoked response which showed an intramodality unspecific behaviour with maximal amplitude in the central region.

Computers↗
PubMed1973

Power spectra of cortical electric activity in the rabbit in relation to conditioned reflexes.

In chronic experiments on rabbits spectral and correlation characteristics of cerebral cortical potentials were computed to study the elaboration of a conditioned defense reflex. was found that the frequency spectra of the EEG are subject to consistent changes: a narrow-band frequency constantly developing in the theta range. During exposure to a positive conditioned stimulus, the maximum of this frequency increased relative to the pre-stimulus period and a maximal coherence of electrical processes was observed in a narrow theta range between the electrical processes of the cortical analyzers to which the conditional and unconditional stimuli were addressed. Different relationship was noted in the theta range during presentation of a differential or extinguishing stimuli: it became slightly slower than in the pre-stimulus period, and the coherence of the theta rhythms was less than maximal, remaining high at the other frequencies. It was concluded that the presence of highly coherent electrical processes in the theta range is important for the formation of conditioned reflex in the rabbit cerebral cortex. The processes of internal inhibition are characterized electrographically by disagreement of electrical processes in the theta range in respect to phase or frequency.

Animals↗