Developmental changes in the alpha response system.
- Authors
- Yordanova, J Y; Kolev, V N
- Year
- 1996
- Journal
- Electroencephalography and clinical neurophysiology
- PMID
- 9020812
- DOI
- 10.1016/s0013-4694(96)95562-5
Evoked and event-related brain potentials (ERPs) may be regarded as originating from the reorganization of the spontaneous EEG rhythms. The main objective of the present research was to study the alpha responses in 6-11 year old children to determine whether the ability to reorganize alpha activity after external stimulation demonstrates developmental changes that could reflect variations in information processing with increased age. A total of 50 children aged 6-11 years, divided into 5 age groups, and 10 young adults were assessed in a passive and an oddball condition. Alpha responses in the passive and non-target ERPs at Fz, Cz and Pz were analyzed to assess quantitatively the repeatability (phase-locking) of the evoked alpha oscillations. The alpha responses in 6-11 year old children were different from those in adults: (1) adults had significantly lower amplitude and stronger phase-locking than children; (2) adults had maximal alpha amplitudes and phase-locking over the vertex, whereas children displayed maximal responses over the parietal site; (3) the phase-locking of eldest (10-11 year old) children was as strong as in adults. These findings indicate that the alpha response system is functionally involved in 6-11 year old children, though its development is not complete at the age of 11, and the magnitude and the phase-locking parameters may relate to different functional aspects of the alpha response system. Thus, younger children do produce alpha responses during information processing, but are not able to engage this system as strongly as older children and adults.
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