Dynamic characteristics of visual evoked potentials in the dog. II. Beta frequency selectivity in evoked potentials and background activity

doi:10.1016/0013-4694(70)90138-0

Electroencephalography and Clinical Neurophysiology

Volume 29, Issue 3, September 1970, Pages 260-268

https://doi.org/10.1016/0013-4694(70)90138-0 Get rights and content

Abstract

1.
1. Sinusoidally modulated light (SML) evoked potentials recorded from the posterior marginal gyrus were described as generated by a beta frequency selective system.
2.
2. The beta resonance is related to the dominant mode of spontaneous activity recorded from the same brain area and characterized by means of power spectra.
3.
3. The resonance behaviour of cortical SML evoked potentials was dependent on the state of the animal and disappeared during light Nembutal anaesthesia.
4.
4. A linear model including resonance was devised to account for the cortical frequency selective system. The model was tested experimentally by obtaining the system's impulse response by means of cross-correlating the input and output of the system excited with noise modulated light.
5.
5. The implications of beta selectivity in terms of neural pathways and networks are discussed.

Résumé

1.
1. Les potentiels évoqués par lumière sinusoïdalement modulée (LMS) au niveau du gyrus marginal postérieur sont décrits comme produits par un système sélectif de fréquence bêta.
2.
2. La résonance bêta est liée au mode dominant d'activité spontanée enregistrée au niveau de la même aire cérébrale, caractérisée au moyen de spectres de puissance.
3.
3. Le comportement de résonnance des potentiels évoqués corticaux à la LMS dépend de l'état de l'animal et disparaît lors d'une anesthésie légère au Nembutal.
4.
4. Un modèle linéaire comportant la résonannce a été élaboré pour rendre compte du système sélectif de fréquence bêta corticale. Ce modèle a été testé expérimentalement en obtenant les réponses d'impulsion du système au moyen d'une cross-corrélation de l'entrée et de la sortie du système excité par une lumière modulée par un signal de bruit.
5.
5. Les implications de la sélectivité bêta en termes de voies et de réseaux neuroniques sont discutées.

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Consequently, the field potentials seen on the scalp is a spatial average of many components, and the presence of an alpha rhythm of a particular type depends on which component happens to be the most highly synchronized process over the largest superficial area. Seminal works (Lopes da Silva et al., 1970a,b, 1973a,b) suggest that, in the parieto-occipital cortex, many small generators are present which, in healthy conditions, are largely in synchrony, although they may vary considerably from moment to moment. This kind of variability holds for the generators at different brain depths as well as for the generators distributed over the cortex.
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Dynamic characteristics of visual evoked potentials in the dog. II. Beta frequency selectivity in evoked potentials and background activityCaracteristiques dynamiques des potentiels evoques visuels chez le chien. II. Selectivite de la frequence beta dans les potentiels evoques et l'activite de fond

Abstract

Résumé

Exp. Neurol.

Exp. Neurol.

Electroenceph. clin. Neurophysiol.

Electroenceph. clin. Neurophysiol.

Int. Rev. Neurobiol.

Electroenceph. clin. Neurophysiol.

Electroenceph. clin. Neurophysiol.

Electroenceph. clin. Neurophysiol.

Atlas of the dog's brain

COBRA computer of binary, relay and analogue correlation function

Network analysis and feedback amplifier design