Special Audiological Tests

To Differentiate Cochlear versus Reterocochlear Site of lesions, we need special audiological tests

Tone Decay Test (TDT)

Principle of TDT is based upon Auditory Adaptation Phenomenon and is diagnostic procedure for identifying Retrocochlear pathology.

Short Increment Sensitivity Index (SISI)

This test is based on Difference Limen of Intensity (DLI) which refers to ability of the ear to detect the smallest change in intensity (as small as 1 dB change) and is diagnostic procedure for identifying Cochlear Pathology.