--Disease Characteristics-- Diagnostically proven panic disorders with or without moderate or severe agoraphobia and anxiety disorders without panic or agoraphobia Panic disorder may be accompanied by a secondary Axis 1 diagnosis of another disorder, such as depression, generalized anxiety disorder, or dependent, histrionic, or compulsive personality disorder --Prior/Concurrent Therapy-- Surgery: No prior ear surgery Other: No concurrent medication for medical or psychiatric conditions At least 2 weeks since prior medication No ototoxic drug intake --Patient Characteristics-- No medical disorders At least 2 weeks since prior upper respiratory tract infection and recovered No history of migraine No head trauma No scoliosis No alcoholism No drug abuse No family history of schizophrenia