Auditory Acuity After Removal of the Entire Right Cerebral Hemisphere

Dr. Walter E. Dandy1has recently reported five cases in which the entire right cerebral hemisphere was removed for "the cure or attempted cure of invasive and otherwise incurable cerebral tumors." It is interesting to note that in three of these patients there was no evident mental impairment; they answered questions accurately and promptly, and showed no loss of memory. In all of the cases reported by Dr. Dandy, it was noted by gross test that the hearing was normal. Very careful tests of auditory function were made on one patient whose entire right cerebral hemisphere was removed on Oct. 25, 1927. November 29, the first attempt was made to test the hearing. It was found that she could hear and accurately repeat words whispered in each ear with the opposite ear masked. This test was repeated and verified on the following day. December 1, she heard in each ear the