A 40 year old man presents to the general medicine clinic complaining of progressive hearing loss in his right ear. He says that over the past year, he has had difficulty hearing conversations in noisy places such as restaurants. In the past few months, he has experienced occasional ringing in his right ear. His hearing in his left ear has not been affected. He denies headache, veigo, otalgia, facial pain, or weakness. He has no medical problems and does not take any medications. Otoscopic examination reveals pearly gray tympanic membranes bilaterally without any bulge or retraction. A Weber's test is performed, and the patient repos hearing the vibration loudest in his left ear. Which of the following findings would MOST likely be observed in this patient?