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Titolo:
THE PRESACCADIC CORTICAL NEGATIVITY PRIOR TO SELF-PACED SACCADES WITHAND WITHOUT VISUAL GUIDANCE
Autore:
KLOSTERMANN W; KOMPF D; HEIDE W; VERLEGER R; WAUSCHKUHN B; SEYFERT T;
Indirizzi:
UNIV LUBECK,DEPT NEUROL,ALLEE 160 D-23538 LUBECK GERMANY
Titolo Testata:
Electroencephalography and clinical neurophysiology
fascicolo: 3, volume: 91, anno: 1994,
pagine: 219 - 228
SICI:
0013-4694(1994)91:3<219:TPCNPT>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
SUPPLEMENTARY MOTOR AREA; FRONTAL EYE FIELDS; MOVEMENT-RELATED POTENTIALS; POSTERIOR PARIETAL CORTEX; FINGER MOVEMENT; CEREBRAL POTENTIALS; PREFRONTAL NEURONS; VOLUNTARY SACCADES; TRIGGERED SACCADES; GUIDED SACCADES;
Keywords:
SACCADIC EYE MOVEMENTS; PRESACCADIC POTENTIALS; BEREITSCHAFTSPOTENTIAL; SELF-PACED; OCULAR MOTOR CORTICAL AREAS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
53
Recensione:
Indirizzi per estratti:
Citazione:
W. Klostermann et al., "THE PRESACCADIC CORTICAL NEGATIVITY PRIOR TO SELF-PACED SACCADES WITHAND WITHOUT VISUAL GUIDANCE", Electroencephalography and clinical neurophysiology, 91(3), 1994, pp. 219-228

Abstract

The presaccadic negativity (PSN) of the scalp EEG potential prior to self-initiated saccades aimed either at a visual target or at the remembered position of that target in total darkness was analysed in 10 normal subjects. Under both conditions a PSN with a negligible EOG contamination was found, showing 4 characteristics: (1) In both conditions,the PSN maximum is localized at the vertex, probably containing the activity of the supplementary motor area. (2) At an electrode placed over the frontal eye field (FEF) contralateral to the saccade direction.there is a temporary, circumscribed maximum prior to saccades to the visual target, thus probably reflecting activity of the FEF. (3) Priorto saccades to the visual target, there is a statistically significant interhemispheric difference of the PSN over the parietal cortex witha larger amplitude over the hemisphere contralateral to the saccade direction; this might be attributed to directed visual attention. (4) Prior to saccades without visual guidance in darkness there is a statistically significant interhemispheric difference of the PSN over the frontal cortex with a larger amplitude over the hemisphere contralateralto the saccade direction. The amplitude of the PSN decreased in the course of the experiment: probably due to psychological factors such asattention and motivation. Our results suggest that the PSN is a readiness potential preceding voluntary saccades, containing activity related both to unspecific psychological processes and to specific movementpreparation in the frontal and parietal ocular motor areas.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 16/07/20 alle ore 16:21:49