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[Multiband spectral analysis and standardized markers of the slope of pediatric electroencephalograms]
J R Valdizán1, M A Navascués, M V Sebastián
1Servicio de Neurofisiología Clínica, Hospital Miguel Servet, Zaragoza, España. valdizan@lander.es
Insights
Electroencephalogram (EEG) studies in children show increased beta frequencies during auditory and visual cognitive tasks. Alpha frequency decreased in frontotemporal regions during auditory tasks, with significant beta frequency changes observed across cortical sites.
Area of Science:
- Neuroscience
- Cognitive Neuroscience
- Developmental Neuroscience
Context:
- The electroencephalogram (EEG) in infants is linked to cognitive disabilities.
- Cortical distribution of EEG frequencies during cognitive processes in children is less understood.
- This study focuses on healthy children's EEG during cognitive tasks.
Purpose:
- To describe the electroencephalogram (EEG) of healthy children during cognitive activities.
- To investigate the relationship between EEG frequencies and intellectual tasks in children.
- To analyze cortical EEG patterns during auditory and visual attention tests.
Summary:
- Healthy children (average age 9.3 years) underwent auditory memory and visual identification tasks.
- EEG measurements in the frequency and temporal domains were analyzed.
- Results showed increased beta frequencies across cortical sites, particularly T3, T4, O2, T6, O1, T5, and T3 during tasks.
- Alpha frequency decreased in frontotemporal regions during auditory tasks.
- Hjorth complexity values were lower than in adults.
Impact:
- Provides insights into the neurophysiological basis of cognitive processing in healthy children.
- Establishes baseline EEG patterns for attention-related tasks in pediatric populations.
- Highlights differences in EEG complexity between children and adults during cognitive tasks.
Introduction:
The infantile electroencephalogram has been studied in connection with many cognitive disabilities. Although normal resting infantile bioelectric recordings are known, the cortical distribution of electroencephalographic frequencies during other sensory and/or cognitive mental processes is less well known.
Objective:
Our interest is based on the description of EEGs of a homogeneous sample of healthy children and their relation to intellectual activities.
Material And Methods:
The sample studied was made up of 13 healthy children with an average age of 9.3 +/- 1.3 years, on whom two types of tests of attention were done. One of the tasks was a simple auditory memory test and consisted of the spoken repetition of a series of numbers previously heard, which was of variable length. The second test consisted of the identification and crossing out of one face of a series of three faces, which included one which was different from the others. The methodology chosen was electroencephalographic measurement in the frequency and temporal domains.
Results And Conclusions:
There was a relative increase in beta frequencies in all cortical sites which was significant in T3 and T4 with the auditory test and in all electrodes with the visual test. During auditory testing reduction in the alpha frequency was observed in frontotemporal regions. The greatest cortical variations of beta frequency occurred, in the facial test, in the electrodes O2, T6, O1, T5 and T3. The values of Hjorth complexity obtained varied within the interval 1 to 3, which was a considerably lower interval than that found in adult populations.