be used to accurately establish the threshold the patient indicates detection of the tone by operating a switch device the results of such testing are conventionally recorded as an 34 audiogram 34 or a plot of hearing threshold for each ear at the test frequencies with young children as patients it is extremely difficult to attract their attention and interest in such test with the result that they may not concentrate properly and reliably respond to the test tones as each is heard during the full time required for a test sequence the present invention uses a colour video display unit crt showing a microprocessor produced image to both attract the child 39 s attention and to provide positive reinforcement to legitimate responses by the child during testing for reinforcement purposes the graphics sequence is alterable in a manner favourable to the child upon activation of the switch device within a preset time window following initiation of each tone for example a 34 moving 34 train may be displayed with children or faces displayed in an offset region of the display unit this constitutes the 34 attract 34 mode at the start of testing the trains stops at a station and the image changes to a carriage with windows a positive response from the child to a tone will cause a face to be moved into a train carriage and appear at a window further positive response will progressively move faces into the carriage other graphic sequences have been found equally satisfactory for this purpose they all essentially involve the realisation of a goal which the child finds desirable examples of.