FRESH Noise - A Fresh Approach to Pediatric Testing

Keeley Moore: FRESH noise, or frequency-specific hearing assessment noise, is a narrowband noise (NBN) stimulus designed for the purpose of measuring hearing thresholds. It is frequency specific due to extremely steep filter slopes. Because of these steeply sloping filters slopes, the stimulus does not spread beyond the desired frequency range. In addition to being frequency specific, it is appropriate for threshold testing because it is calibrated in dB HL, unlike narrowband noise. FRESH noise came about because of the realization that narrowband noise was being used as a stimulus for testing. Studies show that when you test threshold levels with different stimuli, you find approximately the same threshold results with pure tones, frequency modulated tones, and FRESH noise. However, with narrowband noise, threshold values not consistent with thresholds obtained with the other stimuli. This obviously leads to errors in testing. Narrowband noise was originally designed not as a testing stimuli but as a masking noise, in order to address the challenge of how to go about testing an individual ear.

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