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Different developmental rates of selected brain structures in humans

100%

Dambska M., Kuchna I.

Acta Neurobiologiae Experimentalis

1996

vol. 56

issue 1

83-93

Various rates of development are characteristic for particular structures of the human central nervous system (CNS). The differences of the maturing brain steam and telencephalon are evident in routine neuropathological examination. The fetal and postnatal archi- and neocortex also reveals uneven levels of maturation. In order to precisely describe those differences in humans we performed a morphological and morphometric study on the dorsal vagal nucleus of the medulla oblongata, on Ammon's horn and on neocortex from midgestation to the 18th postnatal month. The numerical density of neurones, cell perikarya andnuclear cross-sectional area, and the ratio of nucleus to perikaryon area were measured. The results demonstrate a development-dependent decrease in cell density and progressive differentiation of neurones according to their changing size. They express a process of maturation which differs in rate across the CNS structures examined.

Reduced degree of long-range phase synchrony in pathological human brain

86%

Bhattacharya J.

Acta Neurobiologiae Experimentalis

2001

vol. 61

issue 4

309-318

In this paper multivariate spontaneous EEG signals from three broad groups of human subjects - control, seizure, and mania - were studied with the aim of investigating the possible effect of these pathologies on the degree of phase synchronization between cortical areas. The degree of phase synchrony was measured by two recently developed measures which are more suitable than classical indices like correlation or coherence when dealing with nonlinear and non-stationary signals like the EEG. Signals were reduced to seven frequency bands (delta, theta, alpha-1, alpha-2, beta-1, beta-2 and gamma) which were statistically compared between the normal and the other two groups. It was found that the degree of long-range synchrony was significantly reduced for both pathological groups as compared with the control group. No clear differences were found in the degrees of short-range synchrony.

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2 Acta Neurobiologiae Experimentalis

1 2001

1 1996

1 Bhattacharya J.

1 Dambska M.

1 Kuchna I.

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Different developmental rates of selected brain structures in humans

Reduced degree of long-range phase synchrony in pathological human brain