Various authors have drawn attention to the fact, that alcoholic patients suffering from hallucinations behold their false perceptions increase in intensity under the influence of peripheral stimuli. This is especially the point studied by Cololian and Rodiet. Hallucinations of the various senses were thus induced: olfactory by alternate compression and relaxation of the nostrils; gustatory by lightly rubbing the upper surface of the tongue; auditory by lightly tapping the external auditory meatus; visual by compression of the eyeballs, etc. This hyperesthesia, which they believe is localised in the cortex of the brain, in the sensecentres, is, however, not limited to the brain, as we know that the peripheral nerves, the nerve-endings, are also affected; but the nature of the lesion is probably not the same, for in the latter case we know that there is evidence of peripheral neuritis, and the brain may not present any definite lesion. These phenomena are only present in a limited number of cases, and only in recent alcoholic cases, before the toxin is eliminated. In order to guard against error, they exclude all cases deeply intoxicated, with much agitation, with delirium tremens, fever, etc. Complete notes of eight cases presenting these induced hallucinations are given.
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