Behavioral Phenotype Associations With Resting State EEG Signal Complexity and Power Spectral Density in Fragile X...

Area of Science:

• Neuroscience
• Genetics
• Clinical Psychology

Background:

• Fragile X Syndrome (FXS) is an X-linked genetic disorder causing intellectual disability, autism spectrum disorder (ASD), and attention deficit hyperactivity disorder (ADHD).
• Individuals with FXS exhibit distinct electrophysiological (EEG) alterations in resting state measures like signal complexity and power spectral density (PSD).
• The precise association between these EEG markers and specific behavioral phenotypes in FXS requires further comprehensive investigation.

Purpose of the Study:

• To investigate the relationship between resting state EEG markers and common symptoms in individuals with FXS.
• To determine if EEG biomarkers correlate with the severity of core FXS symptoms.

Main Methods:

• Collected EEG and behavioral data from 41 individuals diagnosed with FXS, aged 7 to 34 years.
• Employed correlational analyses to examine associations between EEG markers (signal complexity, PSD) and behavioral symptomatology.
• Focused on key phenotypes including intellectual disability, ASD traits, ADHD symptoms, and social behaviors.

Main Results:

• Positive correlations were found between higher EEG signal complexity and non-verbal intelligence quotient (NVIQ).
• Reduced alpha power, a known FXS biomarker, was associated with increased social avoidance.
• Decreased high gamma power correlated with the presence of hyperactive symptoms.

Conclusions:

• Significant relationships exist between established EEG biomarkers and core symptoms of FXS.
• EEG biomarkers demonstrate correspondence with symptom severity in FXS.
• These findings underscore the potential of EEG markers as objective measures for treatment outcomes in FXS research.