Related Experiment Video
Updated: Oct 18, 2025
EEG Mu Rhythm in Typical and Atypical Development
Published on: April 9, 2014
The Effect of Baseline on Toddler Event-Related Mu-Rhythm Modulation
Caterina Piazza1, Eleonora Visintin2, Gianluigi Reni1
1Bioengineering Laboratory, Scientific Institute, IRCCS E. Medea, Bosisio Parini, 23842 Lecco, Italy.
Insights
Choosing the right baseline is crucial for accurately measuring mu-rhythm activity (mu-ERD/ERS) in toddlers during action observation and execution tasks. A static image baseline (BL1) appears more sensitive for eliciting significant mu-rhythm modulations in this population.
Area of Science:
- Neuroscience
- Developmental Psychology
- Cognitive Science
Background:
- Event-related mu-rhythm activity is widely used to study socio-cognitive processes in children.
- Mu-rhythm desynchronization/synchronization (mu-ERD/ERS) is typically calculated relative to a baseline condition.
- The choice of baseline can influence the interpretation of mu-ERD/ERS findings in pediatric research.
Purpose of the Study:
- To investigate the impact of different baseline conditions on mu-ERD/ERS during action observation and execution tasks in toddlers.
- To compare mu-ERD/ERS values obtained using a static image baseline (BL1) versus a stillness baseline (BL2).
Main Methods:
- Participants: Toddlers.
- Task: Action observation (AO) and action execution (AE).
- Analysis: Comparison of mu-ERD/ERS calculated against two distinct baseline conditions (BL1: static image; BL2: stillness).
Main Results:
- Most toddlers exhibited mu-rhythm suppression during the task, indicating significant mu-ERD.
- The magnitude of mu-ERD varied depending on the baseline used; one baseline sometimes failed to yield significant results.
- A static image baseline (BL1) was generally more sensitive for detecting mu-rhythm modulations in toddlers, though individual differences were noted.
Conclusions:
- The selection of an appropriate baseline is critical for reliable mu-ERD/ERS measurements in pediatric populations.
- Researchers should consider verifying baseline mu-rhythm activity, employ single-subject analyses, and potentially use multiple baselines.
- Careful consideration of baseline choice and result interpretation is recommended for studies on pediatric mu-rhythm activity.
Abstract:
Event-related mu-rhythm activity has become a common tool for the investigation of different socio-cognitive processes in pediatric populations. The estimation of the mu-rhythm desynchronization/synchronization (mu-ERD/ERS) in a specific task is usually computed in relation to a baseline condition. In the present study, we investigated the effect that different types of baseline might have on toddler mu-ERD/ERS related to an action observation (AO) and action execution (AE) task. Specifically, we compared mu-ERD/ERS values computed using as a baseline: (1) the observation of a static image (BL1) and (2) a period of stillness (BL2). Our results showed that the majority of the subjects suppressed the mu-rhythm in response to the task and presented a greater mu-ERD for one of the two baselines. In some cases, one of the two baselines was not even able to produce a significant mu-ERD, and the preferred baseline varied among subjects even if most of them were more sensitive to the BL1, thus suggesting that this could be a good baseline to elicit mu-rhythm modulations in toddlers. These results recommended some considerations for the design and analysis of mu-rhythm studies involving pediatric subjects: in particular, the importance of verifying the mu-rhythm activity during baseline, the relevance of single-subject analysis, the possibility of including more than one baseline condition, and caution in the choice of the baseline and in the interpretation of the results of studies investigating mu-rhythm activity in pediatric populations.
