Neurofeedback option implementation

This graphing library and the lower-level Brain library would certainly make it possible and relatively simple to implement what you've described, but I hope you can understand that implementing every possible use-case is outside of the scope of both a software library's purpose and its maintainer's responsibilities.

You are free and encouraged to implement the feedback loop you've described. GPT 4 can give you a rough starting point:

To create a neurofeedback implementation that modulates music volume or produces a tone based on gamma wave activity, you'll need to integrate and process EEG data in real-time. Given the specifications and the tools mentioned, here's a high-level approach using the Arduino for EEG data collection and Processing for data analysis and audio feedback.

1. Collecting EEG Data

You'll use an EEG headset that outputs brainwave data and an Arduino board as an interface. The Arduino Brain Library will help you capture the EEG signals.

Arduino Setup: Connect your EEG device to the Arduino. Depending on your EEG device, you might need to configure the connection properly (e.g., via analog pins for raw signal output).

Brain Library: Utilize the Arduino Brain Library to read the EEG data. This library will help you interpret the signals from the EEG device, focusing on extracting gamma wave information.

2. Processing and Analysis

Processing will be used for the analysis of gamma waves and the audio feedback mechanism. You'll need the Processing environment and the BrainGrapher (or a similar library) for visualizing EEG data, although for this project, the visualization part may be secondary to the audio feedback logic.

Data Transfer: Send the EEG data from Arduino to Processing. This can usually be done over a serial connection. Ensure the baud rates of Arduino and Processing match.

Gamma Wave Analysis: Implement a moving average filter for gamma waves over a 30s window, updated every 0.125s. You will calculate the average power of gamma waves and adjust the audio feedback based on this moving average.

Threshold Logic: Define a threshold based on the power level surpassed 75% of the time during the preceding 30s. If the current average power exceeds this threshold, trigger the audio feedback (increase volume or play a tone).

Rate Limit for Tones: Ensure the tone's maximum rate is capped at one per second to avoid overwhelming the user.

Implementation Sketch

Arduino Code (Data Collection)
#include <Brain.h>

Brain brain(Serial);

void setup() {
  Serial.begin(9600);
}

void loop() {
  if (brain.update()) {
    Serial.println(brain.readGamma()); // Send gamma wave data to Processing
  }
}
Processing Code (Analysis and Feedback)
import processing.serial.*;

Serial myPort;
String portName = "COM3"; // Update with your COM port
float gammaValue = 0;
int lastToneTime = 0;

void setup() {
  size(400, 300);
  println(Serial.list());
  myPort = new Serial(this, portName, 9600);
}

void draw() {
  if (myPort.available() > 0) {
    gammaValue = myPort.parseFloat(); // Read gamma wave value
    processGamma(gammaValue);
  }
}

void processGamma(float gamma) {
  // Implement moving average calculation over 30s with updates every 0.125s
  // This is a simplified placeholder for the actual logic

  // Example condition to increase volume or play tone
  if (millis() - lastToneTime > 1000 && gamma > threshold) { // Assuming 'threshold' is defined
    playTone(); // Define this function to play a tone or adjust volume
    lastToneTime = millis();
  }
}

void playTone() {
  // Code to play a tone or adjust music volume
}
This is a simplified implementation. The actual logic for calculating the moving average, determining the threshold, and controlling the audio output will need to be developed based on your specific requirements and the capabilities of your audio system.

Remember, this approach requires you to handle serial communication effectively, manage timing for data processing and feedback, and implement the signal processing logic accurately to ensure meaningful neurofeedback.

Best of luck with your project.

Closing this issue since it's a request to implement a different project, and not an issue with BrainGrapher.

kitschpatrol / BrainGrapher

Neurofeedback option implementation #7

1. Collecting EEG Data

2. Processing and Analysis

Implementation Sketch

Arduino Code (Data Collection)

Processing Code (Analysis and Feedback)