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Titolo:
Neural consequences of acting in near versus far space: a physiological basis for clinical dissociations
Autore:
Weiss, PH; Marshall, JC; Wunderlich, G; Tellmann, L; Halligan, PW; Freund, HJ; Zilles, K; Fink, GR;
Indirizzi:
KFA Julich GmbH, Forschungszentrum, Inst Med, D-52425 Julich, Germany KFA Julich GmbH Julich Germany D-52425 Inst Med, D-52425 Julich, Germany Univ Dusseldorf, Neurol Klin, D-4000 Dusseldorf, Germany Univ Dusseldorf Dusseldorf Germany D-4000 in, D-4000 Dusseldorf, Germany Univ Dusseldorf, C & O Vogt Hirnforsch Inst, D-4000 Dusseldorf, Germany Univ Dusseldorf Dusseldorf Germany D-4000 st, D-4000 Dusseldorf, Germany Radcliffe Infirm, Dept Clin Neurol, Neuropsychol Unit, Oxford OX2 6HE, England Radcliffe Infirm Oxford England OX2 6HE ol Unit, Oxford OX2 6HE, England Univ Wales Coll Cardiff, Sch Psychol, Cardiff CF1 1XL, S Glam, Wales Univ Wales Coll Cardiff Cardiff S Glam Wales CF1 1XL 1 1XL, S Glam, Wales
Titolo Testata:
BRAIN
, volume: 123, anno: 2000,
parte:, 12
pagine: 2531 - 2541
SICI:
0006-8950(200012)123:<2531:NCOAIN>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
HUMAN EXTRASTRIATE CORTEX; LINE BISECTION; VISUAL-CORTEX; NEGLECT; ATTENTION; NEURONS; MECHANISMS; MOVEMENT; MONKEYS; SHAPE;
Keywords:
line bisection; pointing; positron emission tomography; visuomotor processing; visuoperceptual processing;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Life Sciences
Citazioni:
43
Recensione:
Indirizzi per estratti:
Indirizzo: Fink, GR KFA Julich GmbH, Forschungszentrum, Inst Med, Postfach 1913, D-52425 Julich, Germany KFA Julich GmbH Postfach 1913 Julich Germany D-52425 ch, Germany
Citazione:
P.H. Weiss et al., "Neural consequences of acting in near versus far space: a physiological basis for clinical dissociations", BRAIN, 123, 2000, pp. 2531-2541

Abstract

We used PET to determine which brain regions are implicated when normal volunteers bisect horizontal lines and point to dots in near (peripersonal) or far (extrapersonal) space. Studies of line bisection in patients with right hemisphere lesions have shown that bisection performance can be severelyimpaired in either near or far space while remaining within normal limits in the other spatial domain. Likewise, clinical dissociations between pointing to objects in near and far space have been reported. The normal functional anatomy of these dissociations has not been demonstrated convincingly. Regional cerebral blood flow measurements using PET were carried out in 12 healthy right-handed male volunteers who bisected lines or pointed to dots in near or far space, using a laser pen. Subjects performing either task innear space showed neural activity in the left dorsal occipital cortex, left intraparietal cortex, left ventral premotor cortex and left thalamus, In far space, subjects performing either task showed activation of the ventraloccipital cortex bilaterally and the right medial temporal cortex. These data provide physiological support for the clinically observed dissociationsdemonstrating that attending to and acting in near space differentially employs dorsal visuomotor processing areas, whereas attending to and acting in far space differentially draws on ventral visuoperceptual processing areas, even when the motor components of the tasks are identical when performedin the two spaces.

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Documento generato il 25/01/20 alle ore 16:19:05