Using Noise to create a a sporadic twitch movement

So currently working through This project, and i just have a one more major thing.

I’m trying to make it so that the head, the ears and the eyebrows of the bear that i’m drawing twitch or vibrate using noise, this movement should happen when the boolean isAngry == true once the user has brought a “pepper” to the face of the bear. once the circle collision detection has ran.

if (isAngry == true) {

	
// draw bear's head
	

	ofSetColor(255, 0, 0);
	ofDrawCircle(bearHead.x, bearHead.y, bearHeadSize);


	// draw bear eyes

	
	ofSetColor(0, 0, 0);
	ofDrawCircle(bearEye.x, bearEye.y, bearEyeSize);
	ofDrawCircle(bearEye2.x, bearEye2.y, bearEyeSize);

    

}

if (isAngry == true) {



   // draw bear's eyebrows on an angle

	ofPushMatrix();
	ofTranslate(bearEyebrow.x, bearEyebrow.y);
	ofSetColor(101, 67, 33);		
	ofRotateZ(45);
	ofDrawRectangle(bearEyebrow.x = 0, bearEyebrow.y = -35, bearEyebrowSizeW + 20, 
            bearEyebrowSizeH + 10);
	ofPopMatrix();

}

if (isAngry == true) {

	ofPushMatrix();

	ofTranslate(bearEyebrow2.x, bearEyebrow2.y);
	ofSetColor(101, 67, 33);		
	ofRotateZ(135);
	ofDrawRectangle(bearEyebrow2.x = -45, bearEyebrow2.y = -25, bearEyebrowSizeW + 20,  
            bearEyebrowSizeH +10);
            
}

What do you need help with? What is the current behavior and the desired behavior?