As for other neurological complications aside from septic infection and hernia formation, there are a few subjective symptoms that may necessitate the invaliding of soldiers. The most common of these is headache, usually in the form of a feeling of weight, pressure, or throbbing in the head, which headache is increased by noise, fatigue, exertion, or emotion. Attacks of dizziness also occur, and nervousness or deficient control over emotions and feelings. Changes of temperament are found in some soldiers, who become depressed, moody, irritable, or emotional, and unable to concentrate attention. Foix, under the direction of P. Marie, worked upon aphasia in 100 cases, reporting results at a surgical and neurological meeting, May 24, 1916, in Paris. Only lesions on the left side of the brain have produced important and lasting speech disorder, although lesions on the left side may leave behind them a little dysarthria or difficulty in finding words in conversation. It is, of course, hard to tell speech disorder from stupor or clouding of consciousness. Foix notes certain specialties in speech defect according to which region of the left brain is affected. First: Prefrontal lesions produce a transient dysarthria, lasting but a few weeks, and right-sided prefrontal lesions produce just as much disorder. Occipital lesions produce no speech disorder. Second: Patients with right-sided hemianopsia due to lesions of occipital regions were not aphasic and could read or write perfectly. Lesions of the left visual centers certainly do not affect reading. If, however, the injury is not to the visual centers, but is upon the lateral part of the occipital lobe, then alexic phenomena appear, and these the more the lesion approaches the temporal-parietal region. Third: Central convolutional lesion produces a variety of disorders according to the site and extent of the lesion. There is no aphasia with the crural monoplegia due to superior paracentral disorder. But slight aphasic disorder accompanies the brachial monoplegia of middle central lesion, though writing, reading, and calculation are slightly affected, and the more so the more the lesion extends posteriorly to the stereognostic regions. The lower down in the precentral region the lesion appears, the more likely is the Broca syndrome to be observed. But if the hemiplegia is chiefly a brachial monoplegia, the aphasic disorder may remain slight, involving reading, writing, understanding of words, the spoken word, articulation, and calculation.