Create stim1.js

Invokes gamma brain waves

stim1.js

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+let flickerRate = 40; // 40 Hz flicker rate (in frames per second)
+let frameDuration;    // Duration of each frame in milliseconds
+let isBlack = true;   // Toggle between black and white
+
+function setup() {
+  createCanvas(windowWidth, windowHeight); // Full-screen canvas
+  frameRate(flickerRate); // Set frame rate to 40 Hz
+  frameDuration = 1000 / flickerRate; // Calculate frame duration in ms (approx 25ms for 40 Hz)
+  background(0); // Start with black
+}
+
+function draw() {
+  // Alternate between black and white each frame
+  if (isBlack) {
+    background(0); // Black
+  } else {
+    background(255); // White
+  }
+  isBlack = !isBlack; // Toggle state
+  
+  // Optional: Add a simple high-contrast pattern (checkerboard)
+  let size = 50; // Size of checkerboard squares
+  for (let x = 0; x < width; x += size) {
+    for (let y = 0; y < height; y += size) {
+      if ((floor(x / size) + floor(y / size)) % 2 === 0) {
+        fill(isBlack ? 255 : 0); // Invert color based on flicker
+      } else {
+        fill(isBlack ? 0 : 255);
+      }
+      noStroke();
+      rect(x, y, size, size);
+    }
+  }
+}
+
+function windowResized() {
+  resizeCanvas(windowWidth, windowHeight); // Adjust canvas if window size changes
+}