allow the use of specialized controllers such as steering wheels, foot pedals or joysticks. Certain game controllers designed in recent years have employed haptic technology to provide realtime, tactile feedback to the user in the form of vibration from the controller. A motion simulator takes the next step by providing the player full-body tactile feedback. Motion gaming chairs can roll to the left and right and pitch forward and backward to simulate turning corners, accelerations and decelerations. Motion platforms permit a more stimulative and potentially realistic gaming experience, and allow for even greater physical correlation to sight and sound in game play. How human physiology processes and responds to motion The way we perceive our body and our surroundings is a function of the way our brain interprets signals from our various sensory systems, such as sight, sound, balance and touch. Special sensory pick-up units (or sensory "pads") called receptors translate stimuli into sensory signals. External receptors (exteroceptors) respond to stimuli that arise outside the body, such as the light that stimulates the eyes, sound pressure that stimulates the ear, pressure and temperature that stimulates the skin and chemical substances that stimulate the nose and mouth. Internal receptors (enteroceptors) respond to stimuli that arise from within blood vessels. Postural stability is maintained through the vestibular reflexes acting on the neck and limbs. These reflexes, which are key to successful motion synchronization, are under the control of three classes of sensory input: Proprioceptors are receptors located in muscles, tendons, joints and the gut, which send signals to the brain regarding the body's position. Aircraft pilots sometimes refer to this type of sensory input as the “seat of the pants”, for instance increase pressure on the body felt in looping manoeuvres, pull-ups and in steep turns. The vestibular system consists of the left and right organs of the "inner ear", each of which has semicircular canals and otoliths. Rotational accelerations in pitch, roll and yaw are sensed through movement of fluid in the three semicircular canals. Linear accelerations in heave, sway and surge are sensed by the "otoliths" which are sensory hairs with a small mass of calcium carbonate on top, so that they bend under linear acceleration. Visual input from the eye relays information to the brain about the craft's position, velocity, and altitude relative to objects in the outside-world (OTW) visual scene. The rate of change of perspective of a