A second note upon homonymous hemiopic hallucinations / by Frederick Peterson.

  • Frederick Peterson
Date:
[1891]
Catalogue details

Licence: Public Domain Mark

Credit: A second note upon homonymous hemiopic hallucinations / by Frederick Peterson. Source: Wellcome Collection.

Provider: This material has been provided by King’s College London. The original may be consulted at King’s College London.

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    ous parts of the occipital cortex (on one side for hemiopic auras).” As regards the hemianopsia of migraine, Dr. Seguin thinks that “spasm of the occipital artery (supplying the cuneus on one side) may quite surely be assumed to occur” (iV. Y. Med. Jour- nal, April 20, 1890, foot-note, page 450), and I am of the opinion that partial anaemias in the cortex due to the same cause may account for the hallucinatory symptoms in the same disease. YV bile irritation from organic lesions and from vascular spasrn easily makes clear the origin of homonymous hemi- opic hallucinations in most of the cases cited above, the manner of their production in a case of paranoia, such as I have described in my first note upon this subject, is rather more difficult to explain. In the periodic functional disorders migraine and epi- lePs>r> where left-sided or right-sided hallucinations and generally hemianopsia precede the attacks, there is a peri- odic occipital cortical discharge with more or less complete obscuration of the visual half fields. In the organic diseases of the brain there are two con- ditions. In Dr. Seguin’s case, simple transitory hallucina- tions announced the ouset of an organic lesion which rap- idly produced complete blindness toward the right. In Di. Y an Duyn s case and in Dr. Uenschen’s four cases—all organic cases the hemiopic hallucinations projected in the dark fields lasted from a few days to a few months. In my own case there was no reason to suspect organic disease of any kind; there was no hemianopsia, and the hallucinations had endured for months. This would be- speak a mild, chronic nutritive disturbance in the cortex, without periodicity, as in migraine and epilepsy, and not
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