Biomedical subjects
K Poeck
Publications and source records attributed to K Poeck.
Aphasia with exclusively consonant-vowel recurring utterances: tan-tan revisited.
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Computed tomography localization of standard aphasic syndromes.
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[Results of a multicenter study on the spontaneous prognosis of aphasias of vascular etiology].
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[Local fibrinolysis therapy in subtotal stenosis of the median cerebral artery].
In a 60-year-old female patient with clinical symptoms of progressive left-sided apoplexia and subtotal stenosis of the middle cerebral artery local fibrinolysis via a floating balloon catheter was successfully used for recanalisation of the vessel leading to marked clinical improvement.
Ideational apraxia.
Ideational apraxia is a rare behavioural disturbance observed in patients with a lesion in the posterior part of the hemisphere dominant for language. The main feature is an impairment in carrying out sequences of actions requiring the use of various objects in the correct order necessary to achieve an intended purpose. The syndrome cannot be explained as being due to paresis, aphasia, impaired visual recognition, mental deterioration or a combination of these disorders. It must be considered as a higher order motor disturbance. Perservation plays an important role but can not explain the syndrome. Evidence is presented to suggest that ideational apraxia is a disturbance in the conceptual organization of actions. Lines of future research are indicated.
Ideomotor apraxia and aphasia: an examination of types and manifestations of apraxic symptoms.
Eighty-eight aphasic patients with the four standard syndromes as well as two control groups, 10 right-sided brain damaged patients and 10 patients without brain damage were examined for ideomotor apraxia by means of 200 tasks. The tasks required oral, arm, leg and bimanual movements, both on verbal command and on imitation. The limb movements were half meaningful, half meaningless. Performances were evaluated according to five response categories: correct, fragmentary, augmentative, perseveratory, other errors. The aim of the investigation was to ascertain whether there are apractic syndromes which are either related to the aphasic syndromes or are characterized by certain types of errors or by manifestation on certain parts of the body. The findings were negative in all three respects. The meaning of these findings for the organization of praxis and language is discussed. The performances of the control groups were consistently higher than those of the aphasic patients.
Facet theory applied to the construction and validation of the Aachen Aphasia Test.
The linguistic performance of 120 aphasic patients of the four standard syndromes assessed by the Aachen Aphasia Test (AAT) is analyzed by a nonmetric (ordinal) multidimensional scaling procedure (Smallest Space Analysis, SSA1). The linguistic structure of the test items is characterized within the framework of L. Guttman's facet theory. Three systematic components (facets) are discerned: linguistic modality, unit, and regularity. Properties of the facets as well as their relations are assessed and tested empirically by analyzing the interrelations among different items or sets of items. The spatial configurations obtained by the scaling procedure fit only partially the expectations derived from the facet-theory model. The modality facet was found to have a strong overriding influence on the aphasic test performance. The facets unit and regularity were only found for the most rigorously designed subtests. Written Language and Comprehension. The results suggest the introduction of a new combined facet linguistic complexity which reflects the dependency of the facets regularity and unit.
What do we mean by "aphasic syndromes?" A neurologist's view.
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Treatment of acquired aphasia: speech therapists and volunteers compared.
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Stereographic reconstruction of human brain CT series.
A relatively simple method for the three-dimensional reconstruction of brain contours from a series of CT scans is presented. A procedure is described for storing the structural information obtained from the CT series and for organizing and displaying the data. Furthermore, it is shown how additional features such as standardized artery information taken from an atlas can be superimposed on the spatially reconstructed brain model. It is proposed that three-dimensional representations in the form of computed stereo pairs are quite suitable for morphological documentation of specific neuropsychological issues, such as the localization of aphasic syndromes.
[Local fibrinolysis in basilar artery thrombosis (author's transl)].
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Axial movements in ideomotor apraxia.
Non-symbolic axial movements were examined and compared to oral and limb movements in a group of 60 aphasic patients (15 of each major subgroup) with exclusively left-sided brain damage. The contention in the literature that axial movements are preserved in patients with ideomotor limb apraxia was not confirmed.
The two types of motor apraxia.
Ideomotor and ideational apraxia are higher motor disturbances at two different levels. In ideomotor apraxia the execution of simple and complex, meaningful and meaningless movements with the orofacial musculature and/or with the limbs, is impaired in a very distinct way, as has been described in detail. The parapraxic distortions of movements occur, when the movement is required out of context. The recognition of movements and gestures is intact. In ideational apraxia, in contrast, there is a disturbance in the conceptual organization of complex actions requiring the use of various objects. The syndrome is observed already in the spontaneous behaviour of the patients. There are indications that these patients are also impaired in the recognition of actions.
The influence of stretched speech presentation on token test performance of aphasic and right brain damaged patients.
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A disturbance in the conceptual organization of actions in patients with ideational apraxia.
Patients with ideational apraxia (i.a.) performed significantly worse than patients without i.a. in a task where they had to arrange pictures in correct order illustrating actions requiring the use of various objects. There was no influence of severity of aphasia nor presence or severity of ideomotor apraxia. In two similar pictorial tasks, where consecutive stages of common events are illustrated, which, however, did not include manipulation of objects, there was no difference in performance of patients with and without i.a. It is concluded that i.a. is a disturbance in the conceptual organization of actions.
[The Aachen Aphasia Test: reliability and inter-rater agreement (author's transl)].
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Ideatory apraxia in a left-handed patient with right-sided brain lesion.
A case is described of a left-handed patient with a circumscribed right-sided posterior brain lesion, who presented with a neuro-psychological syndrome of Wernicke's aphasia, ideomotor and ideatory apraxia. The aphasia and ideomotor apraxia cleared within 10 days, while ideatory apraxia persisted. Ideatory apraxia therefore was not dependent on the language disorder, nor was it related to ideomotor apraxia. On the basis of various neuropsychological examinations, the nature of the apraxic movement disorder in this case is discussed. To our knowledge, this is the first case of ideatory apraxia with right-sided brain damage described in the literature. A particular feature of this patient is that obviously language and the motor functions underlying performance in tests for ideomotor apraxia had a bilateral hemispheric representation whereas a unilateral lesion was sufficient to bring about persistent ideatory apraxia.