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Updated: Jan 5, 2026
Infant Auditory Processing and Event-related Brain Oscillations
Published on: July 1, 2015
Visually Entrained Theta Oscillations Increase for Unexpected Events in the Infant Brain
Moritz Köster1,2, Miriam Langeloh2,3, Stefanie Hoehl2,4
1Institute of Psychology, Free University Berlin.
Insights
Infants
Area of Science:
- Neuroscience
- Developmental Psychology
- Cognitive Science
Background:
- Infants develop expectations about their environment.
- Understanding neural processing of unexpected events in infants is limited.
Purpose of the Study:
- Investigate the infant brain's neuronal processing of unexpected events.
- Examine the role of theta and alpha brain rhythms in response to violated expectations.
Main Methods:
- Used rhythmic visual brain stimulation in 9-month-old infants (N=38).
- Presented expected and unexpected outcomes.
- Measured scalp-recorded electroencephalogram (EEG) oscillations (theta and alpha rhythms).
Main Results:
- Visually entrained theta oscillations significantly increased for unexpected outcomes compared to expected outcomes.
- No significant difference was found in visually entrained alpha oscillations between conditions.
Conclusions:
- Theta rhythm processing of unexpected events may indicate infant learning and representation refinement.
- Visual brain stimulation is a valuable tool for studying infant brain development and oscillatory dynamics.
Abstract:
Infants form basic expectations about their physical and social environment, as indicated by their attention toward events that violate their expectations. Yet little is known about the neuronal processing of unexpected events in the infant brain. Here, we used rhythmic visual brain stimulation in 9-month-olds (N = 38) to elicit oscillations of the theta (4 Hz) and the alpha (6 Hz) rhythms while presenting events with unexpected or expected outcomes. We found that visually entrained theta oscillations sharply increased for unexpected outcomes, in contrast to expected outcomes, in the scalp-recorded electroencephalogram. Visually entrained alpha oscillations did not differ between conditions. The processing of unexpected events at the theta rhythm may reflect learning processes such as the refinement of infants' basic representations. Visual brain-stimulation techniques provide new ways to investigate the functional relevance of neuronal oscillatory dynamics in early brain development.
