 The Johnston's organ is an example of an amphinematic chordotonal organ.The functional significance of the morphological differences of the two forms is unknown, but may confer different viscoelastic properties on the sensory units.In a chordotonal organ, individual sensory neurons can respond to different types of mechanosensory stimuli (for example, sound vs gravity), and those that respond to a particular stimulus can have different tuning properties (for example, tuned to different position of a joint).