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Titolo:
Dynamics of cortical activation in a hemianopic patient
Autore:
Vanni, S; Raninen, A; Nasanen, R; Tanskanen, T; Hyvarinen, L;
Indirizzi:
Helsinki Univ Technol, Low Temp Lab, Brain Res Unit, FIN-02015 Espoo, Finland Helsinki Univ Technol Espoo Finland FIN-02015 , FIN-02015 Espoo, Finland Univ Helsinki, Inst Biomed, Dept Physiol, FIN-00014 Helsinki, Finland UnivHelsinki Helsinki Finland FIN-00014 ol, FIN-00014 Helsinki, Finland Lea Test Ltd, FIN-00100 Helsinki, Finland Lea Test Ltd Helsinki Finland FIN-00100 Ltd, FIN-00100 Helsinki, Finland Finnish Inst Occupat Hlth, Brainwork Lab, Helsinki, Finland Finnish Inst Occupat Hlth Helsinki Finland nwork Lab, Helsinki, Finland
Titolo Testata:
NEUROREPORT
fascicolo: 4, volume: 12, anno: 2001,
pagine: 861 - 865
SICI:
0959-4965(20010326)12:4<861:DOCAIA>2.0.ZU;2-D
Fonte:
ISI
Lingua:
ENG
Soggetto:
VISUAL-PERCEPTION; STRIATE CORTEX; V1; DISCRIMINATION; PARAMETERS; RESPONSES; LUMINANCE; PATTERN; VISION; MOTION;
Keywords:
hemianopia; magnetoencephalography; residual vision; superior temporal cortex; visual field defect;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
25
Recensione:
Indirizzi per estratti:
Indirizzo: Vanni, S Helsinki Univ Technol, Low Temp Lab, Brain Res Unit, POB 2200, FIN-02015 Espoo, Finland Helsinki Univ Technol POB 2200 Espoo Finland FIN-02015 , Finland
Citazione:
S. Vanni et al., "Dynamics of cortical activation in a hemianopic patient", NEUROREPORT, 12(4), 2001, pp. 861-865

Abstract

Although residual vision in patients with cortical blindness is common, its brain mechanisms are poorly known. To study these mechanisms we measured neuromagnetic responses to visual stimuli in a patient with right posteriorcerebral lesion and left visual field hemianopia. His vision had partiallyrecovered with intensive training before our measurements. Compared with the processing in the healthy side, early occipital responses were attenuated for both passive viewing of checkerboard reversal patterns and a letter identification task. In both conditions there were prominent longer-latency responses at the right superior temporal cortex. We suggest that the activation in the superior temporal cortex can partially compensate for the failure to produce synchronized population responses at the early stages of visual cortical processing. NeuroReport 12:861-865 (C) 2001 Lippincott Williams& Wilkins.

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Documento generato il 19/01/20 alle ore 20:17:35