Alexia and left homonymous hemianopia in a non-right-hander.
A non-right-handed patient developed alexia without agraphia from a right occipital lobe infarction. An intracarotid amobarbital test showed left hemispheric dominance for speech. The cause of alexia in this patient could not be explained simply by the accepted disconnection hypothesis, which proposes that speech, handedness, and reading functions reside in the same hemisphere. The findings in this patient suggest that his speech function is located on the left, whereas his functions for reading and writing are located in the right hemisphere.
D004292:Dominance, Cerebral; D004411:Dyslexia, Acquired / Q000209:etiology / Q000503:physiopathology*; D006423:Hemianopsia / Q000503:physiopathology*; D006801:Humans; D008297:Male; D008606:Mental Processes; D008875:Middle Aged; D009778:Occipital Lobe / Q000503:physiopathology; D011932:Reading; D013060:Speech; D014110:Touch; D014796:Visual Perception