1. An audiometer for use with young children comprising: (a) a frequency and level programmable tone generator; (b) an electric-acoustic transducer driven by said tone generator to supply sound to the child whose hearing is being tested; (c) a two-state response switch operated by the child in response to detected acoustic tones; (d) a microprocessor having input-output ports to which the response switch and tone generator are connected; (e) a video display unit for viewing by the child; (f) a graphics controller which drives said display unit connected to a further input-output port of said microprocessor; said microprocessor being programmed to cause a first picture sequence to be displayed, to activate said tone generator at predetermined frequencies and levels, including levels deliberately inaudible to the child, and to alter the first picture sequence to a more favorable picture sequence upon detecting a change of state of the response device within a time window subsequent in time to each tone period.