𝔖 Bobbio Scriptorium
✦   LIBER   ✦

The influence of ageing on complex brain networks: A graph theoretical analysis

✍ Scribed by Sifis Micheloyannis; Michael Vourkas; Vassiliki Tsirka; Eleni Karakonstantaki; Kassia Kanatsouli; Cornelis J. Stam

Publisher
John Wiley and Sons
Year
2009
Tongue
English
Weight
165 KB
Volume
30
Category
Article
ISSN
1065-9471

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

Objective:

To determine the functional connectivity of different EEG bands at the “baseline” situation (rest) and during mathematical thinking in children and young adults to study the maturation effect on brain networks at rest and during a cognitive task.

Methods:

Twenty children (8–12 years) and twenty students (21–26 years) were studied. The synchronization likelihood was used to evaluate the interregional synchronization of different EEG frequency bands in children and adults, at rest and during math. Then, graphs were constructed and characterized in terms of local structure (clustering coefficient) and overall integration (path length) and the “optimal” organization of the connectivity i.e., the small world network (SWN).

Results:

The main findings were: (i) Enhanced synchronization for theta band during math more prominent in adults. (ii) Decrease of the optimal SWN organization of the alpha2 band during math. (iii) The beta and especially gamma bands showed lower synchronization and signs of lower SWN organization in both situations in adults.

Conclusion:

There are interesting findings related to the two age groups and the two situations. The theta band showed higher synchronization during math in adults as a result of higher capacity of the working memory in this age group. The alpha2 band showed some SWN disorganization during math, a process analog to the known desynchronization. In adults, a dramatic reduction of the connections in gray matter occurs. Although this maturation process is probably related to higher efficiency, reduced connectivity is expressed by lower synchronization and lower mean values of the graph parameters in adults. Hum Brain Mapp 2009. © 2007 Wiley‐Liss, Inc.

📜 SIMILAR VOLUMES

Heritability of “small-world” networks i
Heritability of “small-world” networks in the brain: A graph theoretical analysis of resting-state EEG functional connectivity
✍ Dirk J. A. Smit; Cornelis J. Stam; Danielle Posthuma; Dorret I. Boomsma; Eco J. 📂 Article 📅 2008 🏛 John Wiley and Sons 🌐 English ⚖ 188 KB 👁 1 views

## Abstract Recent studies have shown that resting‐state functional networks as studied with fMRI, EEG, and MEG may be so‐called small‐world networks. We investigated to what extent the characteristic features of small‐world networks are genetically determined. To represent functional connectivity

The influence of age on the associations
The influence of age on the associations between HR practices and both affective commitment and job satisfaction: A meta-analysis
✍ Dorien T. A. M. Kooij; Paul G. W. Jansen; Josje S. E. Dikkers; Annet H. De Lange 📂 Article 📅 2010 🏛 John Wiley and Sons 🌐 English ⚖ 190 KB

## Abstract Research on the association between high commitment Human Resource (HR) practices and work‐related outcomes at the individual level rarely focuses on age differences. To fill this knowledge gap, a meta‐analysis has been conducted to examine how the relationships between the availability

Influence of electromagnetic fields on t
Influence of electromagnetic fields on the efflux of calcium ions from brain tissue in vitro: A three-model analysis consistent with the frequency response up to 510 Hz
✍ Dr. C. F. Blackman; S. G. Benane; D. J. Elliott; D. E. House; M. M. Pollock 📂 Article 📅 1988 🏛 John Wiley and Sons 🌐 English ⚖ 821 KB

The frequency dependence of electromagnetic field-induced calcium-ion efflux from chicken brain tissues has been examined at 15-Hz intervals over the range 1-510 Hz. The electric field component was 15 Vrms/m and the magnetic component varied between 59 and 69 nTrms. No patterns of response as a fun

Influence of a ring substituent on the t
Influence of a ring substituent on the tendency to form H2O adducts to Ag+ complexes with phenylalanine analogues in an ion trap mass spectrometer
✍ B. A. Perera; A. L. Gallardo; J. M. Barr; S. M. Tekarli; V. Anbalagan; E. R. Tal 📂 Article 📅 2002 🏛 John Wiley and Sons 🌐 English ⚖ 309 KB

## Abstract In a previous report we showed that certain binary Ag^+^–amino acid complexes formed adduct ions by the attachment of a single water and methanol molecule when stored in an ion trap mass spectrometer: complexes with aliphatic amino acids and with 4‐fluorophenylalanine formed the adduct