A Method to Measure the Discriminability of Spatial Cues

The discriminability of spatial cues refers to the ability of the auditory system to catch any change of sounds. For half a century there were many methods to measure the Just Noticeable Difference(JND) which represents the sensitivity of spatial cue by audio system. The JND should be obtained by a large number of experiments and the results were much various by different people in different experiment condition. This article describes a new method which is an adaptive procedure implemented by computer. The test value can approach the target value fast according to the response of subjects by this adaptive mechanism. This method was adopted in two experiments in order to obtain the JNDs of ILD and ITD. We also compare with the method we proposed and others in speed to target value.