Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Tonic and phasic alertness - One or two right hemispheric cortico-subcortical networks?
Autore:
Hildebrandt, H; Schwendemann, C;
Indirizzi:
Univ Oldenburg, FB Psychol 5, D-26111 Oldenburg, Germany Univ Oldenburg Oldenburg Germany D-26111 l 5, D-26111 Oldenburg, Germany Zent Krankenhaus Bremen Ost, Neurol Klin, Bremen, Germany Zent KrankenhausBremen Ost Bremen Germany Neurol Klin, Bremen, Germany
Titolo Testata:
AKTUELLE NEUROLOGIE
fascicolo: 5, volume: 28, anno: 2001,
pagine: 219 - 227
SICI:
0302-4350(200106)28:5<219:TAPA-O>2.0.ZU;2-1
Fonte:
ISI
Lingua:
GER
Soggetto:
POSITRON EMISSION TOMOGRAPHY; SUSTAINED ATTENTION DEFICITS; NEURAL MECHANISMS; BASAL GANGLIA; REACTION TIME; LESIONS; BRAIN; TASK; ACTIVATION; BEHAVIOR;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Citazioni:
32
Recensione:
Indirizzi per estratti:
Indirizzo: Hildebrandt, H Univ Oldenburg, FB Psychol 5, Postfach 2503, D-26111 Oldenburg, Germany Univ Oldenburg Postfach 2503 Oldenburg Germany D-26111 any
Citazione:
H. Hildebrandt e C. Schwendemann, "Tonic and phasic alertness - One or two right hemispheric cortico-subcortical networks?", AKT NEUROL, 28(5), 2001, pp. 219-227

Abstract

The functional role of the right hemisphere for sustained attention and vigilance is well-known. This investigation focusses on the localisation of different components of sustained attention. We analysed visual simple reaction time with and without acoustic warning for 63 patients with infarcts inthe right hemisphere and compared the results with a control group of 30 patients with lesions in the cerebellum. Moreover we calculated a value which indicated how much the patients profited by the warning tone. We argue that this value is a good indicator for sustained attention. The involved brain areas were transferred into a standardized brain atlas blinded for the results of the neuropsychological investigation. The neuropsychological results of the patients with right hemisphere brain damage, as a whole, were then compared with the control group. We compiled the mean reaction time for overlapping lesion areas and after sub-grouping the 63 right hemisphere patients according to different infarct patterns, we tested the statistical differences between the lesion locations. As a result we found a general slowing in right hemisphere patients. This was most pronounced for lesions involving the right frontal and the posterior parietal areas. But only patientswith lesions involving the white matter of the corona radiata (including the corpus of the caudatum) and patients with lesions involving the insular cortex were impaired in sustained attention, as operationalized by our calculation. The results of the patients with fronto-parietal lesions fit recent PET studies which give evidence to the meaning of these areas for simple reaction tasks. On the other hand. there may be a second network responsible for sustaining attention in the absence of external arousal signals.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 19/01/20 alle ore 09:32:04