Topographic aspects of photic driving in the electroencephalogram of children and adolescents.

V.V Lazarev,A.F.C Infantosi,D Valencio-De-Campos,L.C De Azevedo

doi:10.1590/s0100-879x2004000600014

V.V Lazarev, A.F.C Infantosi + Show 2 more

Open Access

https://doi.org/10.1590/s0100-879x2004000600014

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Abstract

The electroencephalogram amplitude spectra at 11 fixed frequencies of intermittent photic stimulation of 3 to 24 Hz were combined into driving "profiles" for 14 scalp points in 8 male and 7 female normal subjects aged 9 to 17 years. The driving response varied over frequency and was detected in 70 to 100% of cases in the occipital areas (maximum) and in 27 to 77% of cases in the frontal areas (minimum) using as a criterion peak amplitude 20% higher than those of the neighbors. Each subject responded, on average, to 9.7 +/- 1.15 intermittent photic stimulation frequencies in the right occipital area and to 6.8 +/- 1.97 frequencies in the right frontal area. Most of the driving responses (in relation to the previous background) were significant according to the spectral F-test (alpha = 0.05), which also detected changes in some cases of low amplitude responses not revealed by the peak criterion. The profiles had two maxima in the alpha and theta bands in all leads. The latter was not present in the background spectra in the posterior areas and was less pronounced in the anterior ones. The weight of the profile theta maximum increased towards the frontal areas where the two maxima were similar, while the profile amplitudes decreased. The profiles repeated the shape of the background spectra, except for the theta band. The interhemispheric correlation between profiles was high. The theta driving detected in all areas recorded suggests a generalized influence of the theta generators in prepubertal and pubertal subjects.

Highlights

The driving response varied over frequency and was detected in 70 to 100% of cases in the occipital areas and in 27 to 77% of cases in the frontal areas using as a criterion peak amplitude 20% higher than those of the neighbors
The driving response to intermittent photic stimulation (IPS) is an important functional test used in electroencephalography (EEG) in order to enhance the manifestation of the latent sources of rhythmic bioelectrical activity including its pathological forms [1,2]
We investigated the structural specificity of the local driving response in children and adolescents [3]

Summary

Introduction

The driving response to intermittent photic stimulation (IPS) is an important functional test used in electroencephalography (EEG) in order to enhance the manifestation of the latent sources of rhythmic bioelectrical activity including its pathological forms [1,2]. In order to integrate the reactions to different IPS frequencies and compare their amplitudes, we have proposed a “profile” of the driving reaction composed of the amplitude spectra measurements at the frequencies of stimulation from different EEG epochs matched to a range of fixed frequencies of IPS across the EEG frequency range. These profiles proved to repeat the shape of the background spectra with high Pearson correlation coefficients between them, both having the maximum peaks in the alpha frequency band. In comparison with the spectrum of the resting EEG, the driving profile suggested the possibility to provide a fuller representation of the set of potential oscillators

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