Contralateral interference reveals true thresholds about 15-20 dB below the interference level

Evidence

Once the Stenger test has identified the presence of pseudohypacusis, the principle of contralateral interference can be used in an attempt to obtain true thresholds in the feigned ear. When applying this technique, the tester presents a stimulus at 10 dB SL in the better ear, and the sound level in the poorer starts at 0 dB HL and increases in 5 or 10 dB steps until the patient stops responding. This level is the contralateral interference level. The actual threshold is then inferred as being about 15 to 20 dB lower than the contralateral interference level. — Jennifer Lentz, Psychoacoustics- Perception of Normal…, 1769