MLD Tone

The Masking Level Difference-Tone Version 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.

The Masking Level Difference-Tone Version 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. Call 1-800-669-9065 (from US) or 314-416-1050 (outside the US) to order. FREE shipping within the contiguous US.

Masking Level Difference Tone Version; Item 206; Price $81.00 USD + S&H*
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NOTE: Online ordering cannot be used for custom CDs. If you want this recording combined on a CD with other recordings, please email with your test selections along with your state or country instead of using the “Buy Now” button. You will receive a Paypal invoice for your custom order.

*INTERNATIONAL CUSTOMERS: Online ordering does not include shipping and handling charges. Please email with your test selections along with your state or country for an exact quote. If you use online ordering, you will be invoiced later for the shipping charges.

This test is also available on the following products:

  • NCAP Battery includes Duration Pattern Sequence-Standard, Pitch Pattern Sequence – Adult & Child Versions, Random Gap Detection Test-Standard & Expanded Versions, and Masking Level Difference-Tone Version; Item CD117-9; Price $329.75 USD+ S&H


  • ACAP Battery includes Dichotic Digits-Standard, Duration Pattern Sequence-Standard, Dichotic Word Listening Test, Masking Level Difference-Tone, NU-6 Low Pass Filtered at 750 Hz, Time Compressed Sentence Test, Random Gap Detection Test, Selective Auditory Attention Test, and Competing Sentences combined on one CD; Item CD115-9; Price $549.00 USD + S&H


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