Masking Level Difference-Tone©

The Masking Level Difference-Tone© is an auditory processing disorder test. It is considered a binaural interaction test sensitive to low brainstem. The MLD Tone (500Hz) uses nonverbal stimuli. It is a short test in which both hetero- and homo-phasic trials are contained.  A release from masking is expected in the heterophasic conditions. This test was designed and recorded by Richard Wilson. Test administration is approximately five minutes.

The Masking Level Difference-Tone© includes a) audio recording, and b) instructions and score form as printable pdf files. The one-page instructions contain administration, scoring, and interpretation information. Normative data is included, but it is not age-specific. Available from Auditec, Inc. Use the “Buy Now” button below or call 1-800-669-9065 (from US) or 314-416-1050 (outside the US) to order. FREE shipping within the contiguous US. INTERNATIONAL CUSTOMERS: Importers are responsible for duties and taxes. Auditec advises your organization to contact your government to estimate tax prior to ordering.

Masking Level Difference-Tone© (CD Format); Item 206; Price $81.00 USD + S&H*
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This recording is available in other formats. Email questions regarding copyright or other formats to

©COPYRIGHT NOTICE: Auditec’s recordings are protected by copyright. Sharing, uploading to servers, publishing to the internet, and all other forms of distribution are prohibited.

This test also appears on the NCAP Battery and the APD Battery.


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