Create stim2.js

Induce gamma brain waves

stim2.js

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+let flickerRate = 40; // 40 Hz flicker rate
+let angle = 0;        // For rotation
+let isBright = true;  // Toggle between bright and dark states
+
+function setup() {
+  createCanvas(windowWidth, windowHeight);
+  frameRate(flickerRate); // Set to 40 Hz
+  rectMode(CENTER);       // Center shapes for rotation
+  background(0);
+}
+
+function draw() {
+  // Flicker between two states
+  if (isBright) {
+    background(255); // Bright background
+  } else {
+    background(0);   // Dark background
+  }
+  isBright = !isBright; // Toggle
+
+  // Add rotating grid of shapes
+  let gridSize = 80; // Size of grid cells
+  translate(width / 2, height / 2); // Move to center
+  rotate(angle); // Apply rotation
+  angle += 0.02; // Slow rotation speed
+
+  for (let x = -width; x < width; x += gridSize) {
+    for (let y = -height; y < height; y += gridSize) {
+      // Alternate colors based on flicker state and position
+      if ((floor(x / gridSize) + floor(y / gridSize)) % 2 === 0) {
+        fill(isBright ? 0 : 255); // Inverse of background
+      } else {
+        fill(isBright ? 255 : 0);
+      }
+      noStroke();
+
+      // Draw rotating rectangles and circles
+      push();
+      translate(x, y);
+      rotate(angle * 0.5); // Additional rotation for each shape
+      rect(0, 0, gridSize * 0.6, gridSize * 0.6); // Square
+      pop();
+
+      // Overlay smaller flickering circles
+      fill(isBright ? 255 : 0); // Opposite color for contrast
+      ellipse(x, y, gridSize * 0.3); // Circle
+    }
+  }
+}
+
+function windowResized() {
+  resizeCanvas(windowWidth, windowHeight);
+}