Isotonic Joystick

An isotonic joystick is a type of joystick input device that moves freely in response to applied force and returns to a centre position when released. Unlike isometric (force-sensing) joysticks that remain stationary and measure the pressure applied, isotonic joysticks physically deflect in the direction of input, providing proprioceptive feedback through the displacement of the control shaft. In accessibility contexts, isotonic joysticks can serve as alternative pointing devices for users who have difficulty using a mouse, though research shows their effectiveness varies depending on the user's specific motor condition — for example, users with tremor may experience lessening of tremor when gripping the control shaft.