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Updated: Aug 11, 2026
EEG Mu Rhythm in Typical and Atypical Development
Published on: April 9, 2014
EEG theta rhythm in infants and preschool children
E V Orekhova1, T A Stroganova, I N Posikera
1Department of Clinical Neurophysiology, Sahlgrenska University Hospital, 41345 Gothenburg, Sweden. elena@neuro.gu.se
Insights
Theta oscillations in young children are linked to attention and emotion. Their brain activity patterns change with age and behavior, offering insights into cognitive development.
Area of Science:
- Developmental Neuroscience
- Cognitive Neuroscience
- Pediatric EEG Research
Background:
- Theta oscillations are crucial for cognitive functions.
- Limited understanding of theta rhythm's developmental trajectory and behavioral correlates in early life.
- Need for research on how theta and mu rhythms change with age and behavioral states.
Purpose of the Study:
- To investigate the relationship between theta oscillations and behavior in infants and preschool children.
- To analyze age-specific changes in theta and mu rhythms.
- To explore the scalp distribution of theta spectral power during different behavioral conditions.
Main Methods:
- Electroencephalography (EEG) recorded during baseline (visual attention) and test conditions (toy exploration, social stimulation).
- Analysis of EEG spectra using narrow bin analysis to determine age-specific frequency boundaries for theta and mu rhythms.
- Comparison of theta and mu power and frequency across different age groups and behavioral states.
Main Results:
- Increased theta spectral power and decreased mu power observed under test conditions in both infants and preschoolers.
- In preschoolers, theta rhythm showed distinct anterior distribution during exploration and posterior during social attention.
- Theta frequency range shifted from 3.6–5.6 Hz in infants to 4–8 Hz in children; mu range shifted from 6.4–8.4 Hz to 8.4–10.4 Hz.
Conclusions:
- Theta oscillations in early development are strongly associated with behavioral states involving significant attentional and emotional engagement.
- The distribution of theta spectral power is dynamic, influenced by age and specific behaviors, potentially reflecting differential brain network activation.
- Findings enhance knowledge of theta rhythm development, aiding understanding of cognitive and mental processes in children, including those with neuropsychiatric conditions.
Objective:
To study behavioral correlates of theta oscillations in infants and preschool children.
Methods:
EEG was recorded during baseline (visual attention) and two test conditions--exploration of toys and attention to 'social' stimulation. Age specific frequency boundaries of theta and mu rhythms were assessed using narrow bin analysis of EEG spectra.
Results:
Theta spectral power increased whereas mu power decreased under test conditions in both age groups. In preschoolers theta rhythm increased predominantly over anterior regions during exploratory behavior and over posterior regions during attention to social stimulation. Theta frequency range changed with age from 3.6 to 5.6 Hz in infants to 4-8 Hz in children, and mu range from 6.4-8.4 Hz to 8.4-10.4 Hz.
Conclusions:
In early life, theta oscillations are strongly related to behavioral states with substantial attentional and emotional load. The scalp distribution of theta spectral power depends on age and behavioral condition and may reflect engagement of different brain networks in control of behavior.
Significance:
The findings contribute to the scanty knowledge about the developmental course of theta rhythm. Data on behavioral correlates of theta rhythm in early life may improve our understanding of cognitive and mental processes in healthy and neuropsychiatrically diseased children.
