EEG data in time and frequency domains

general: Channel Number, Window Size, Scroll

iEEG Spectrum Visualization Application

Welcome to the iEEG Spectrum Visualization Application! This specialized tool offers an intuitive interface to visualize intracranial EEG data, both in the time and frequency domains.


Output Visualizations

Key Insights

While raw signals in the time domain might appear indistinguishable, processing and filtering them can bring out distinctive features. The differences become especially pronounced in the frequency domain, where variations in EEG segments become evident. Moreover, by utilizing a simple metric such as the band energy ratio, users can quickly determine the EEG state.

Technical Details

The application employs Butterworth bandpass filters, set at a default 2nd order. For spectral analysis, the FFT (Fast Fourier Transform) is used in conjunction with a Hanning window. RMS averaging, exponential weighting, and a set number of averages (10) further enhance the analysis.

Data Source

This application utilizes intracranial EEG data from NeuroVista, which is publicly available at

Closing Note

By transforming and categorizing the raw EEG data, this application offers a profound understanding of the underlying neural activities. Whether you're a researcher, student, or just curious, the tool will provide invaluable insights into the intricacies of EEG recordings.