The threshold-of-interference test: a new test of interhemispheric suppression in brain injury.

A new procedural version of the Willeford competing sentences test (Willeford. Audiol Hear Educ 1976;2:12-20) is introduced here for use with brain damaged patients. The threshold-of-interference test seeks the minimal level of the competing sentences at which the patient can no longer repeat the message at the test ear.