Turn it Up

Question:   A 34 year old patient is referred to your clinic for an incidentally discovered vestibular schwannoma on an MRI obtained for headache.  Audiometry reveals asymmetric sensorineural hearing loss.  The audiologist obtained word recognition scores at two different hearing levels.  At 40 dB HL, she scored 83%, but at 55 dB HL, she scored 69%.  What is the name of this phenomenon?   [Answer will be posted with next week's new question]

Answer to last week's question, Repeat Customer (February 29, 2016): 

Tonsillectomy.  Recurrent peritonsillar abscess is an indication for tonsillectomy.