Coughing is a simple vocal tic
Grunting is a simple vocal tic
Humming is a simple vocal tic
Whistling is a simple vocal tic
Tongue clicking is a simple vocal tic
Throat clearing is a simple vocal tic
Stuttering is a complex vocal tic
Coprolalia is a complex vocal tic
Echolalia is a complex vocal tic
Palilalia is a complex vocal tic
Muttering to oneself is a complex vocal tic
Talking to oneself is a complex vocal tic