Abstract
During stereotactical procedures for the treatment of dyskinesias, pain conditions and epilepsy the anatomical localization of the tip of the stereotactical needle was controlled by bipolar stimulation. Effects on speech were frequently observed, e.g., silencing of speech in the anterior part of the corpus callosum, interruption of speech due to confusion of thinking in the posterior part of the corpus callosum, interruption of speech or compulsory speech as well as alterations in articulation during stimulation of the ventro-oral and posterior part of the thalamus. Usually compulsory speech was combined with other behavioral changes. These effects were predominantly in the dominant hemisphere. Yells and utterances of different kinds could also be evoked from the depth of the thalamus. Evidence is presented that conditioning of the patient plays an important role in the type of speech and phonemes evoked in this way.
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