¶ Recording EEG Data with Stream App
The Stream application from Instinct is a pivotal tool for professionals seeking sophisticated EEG data visualization, analysis, and recording. Designed specifically for the Nexstem Instinct device, the Stream app offers a robust suite of features that enhance the usability and functionality of EEG data management. This article explores how to leverage the Stream application effectively for real-time data streaming, applying filters, recording data, and playback of recorded sessions.
¶ Key Features of the Stream Application
¶ Multiple Visualization Graphs
The Stream app supports various types of visualization graphs, enhancing the analysis of EEG data:
- Real-Time Stream: Displays all 19 channels, with each data point sampled at 1000 Hz, providing a comprehensive view of brain activity in real-time.
- FFT (Fast Fourier Transform): Allows the analysis of the EEG signal in the frequency domain, which is essential for identifying specific frequency components.
- Bandpower Graph: Shows real-time EEG frequency band data (Alpha, Gamma, Beta, Delta, and Theta waves), crucial for monitoring different states of brain activity.
- Time-Frequency Spectrogram: Offers a detailed view of the power spectrum over time, helping in the analysis of changes in brain activity across different states.
¶ Filtering Options
The Stream app includes both IIR (Infinite Impulse Response) and FIR (Finite Impulse Response) filters, which users can apply to the EEG data during live streaming. These filters include:
- Low-pass, High-pass, Band-pass, and Band-stop: Each filter serves to isolate specific frequency ranges or remove unwanted noise from the EEG signals, enhancing the clarity and relevance of the data being analyzed.
¶ Visualizing and Recording EEG Data Using the Stream Application
¶ Getting Started
- Launch the Application: Open the Stream application on your Nexstem Instinct device connected to your visual monitor.
- Login: If prompted, log in using the Nexstem Authenticator app. Follow the on-screen instructions to securely access your device and data.
¶ Streaming EEG Data
- Start the Stream: Click on 'Start Plot' to begin streaming EEG data. The real-time data from all 19 channels will be displayed.
- Select Graphs and Channels: Customize your view by selecting specific graphs and channels that you are interested in monitoring. This customization allows for focused analysis on areas of particular interest or concern.
¶ Recording EEG Data
- Start Recording: To begin recording the EEG data, click the 'Record' button located at the top right of the application interface. This action captures all 19 channels of raw EEG data without any applied filters to maintain consistency in the recording.
- Stop Recording: When you wish to end the recording session, click on the 'Stop Record' button. The recorded data is saved for later review and analysis. Note that only one recording session can be conducted at a time.
¶ Playback and Review
- View Recordings: To review past recordings, click on the 'View Recordings' button on the top left of the application interface.
- Playback: Click the play button associated with a recording file to replay the recorded data in the Stream app.
- Recording Info: The info button next to each recording provides details about the configurations applied before the recording started, helping you understand the context of the data.
¶ Conclusion
The Nexstem Stream application is an invaluable resource for anyone utilizing EEG technology within the Nexstem Instinct ecosystem. By understanding and utilizing its full range of features—from data visualization to sophisticated filtering and straightforward recording mechanisms—users can significantly enhance their ability to monitor, analyze, and understand brain activity effectively and efficiently. Whether for research, clinical analysis, or educational purposes, the Stream app empowers users to leverage EEG data to its fullest potential.