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- The contingent negative variation (CNV) is a negative slow surface potential, as measured by electroencephalography (EEG), that occurs during the period between a warning stimulus or signal and an imperative ("go") stimulus. The CNV was one of the first event-related potential (ERP) components to be described. The CNV component was first described by W. Grey Walter and colleagues in an article published in Nature in 1964. The importance of this finding was that it was one of the first studies which showed that consistent patterns of the amplitude of electric responses could be obtained from the large background noise which occurs in EEG recordings and that this activity could be related to a cognitive process such as expectancy. (en)
- La variación negativa contingente (VNC) es un cambio de potencial [evocado promediado] negativo lento y de larga duración que se desarrolla sobre la región frontocentral del cerebro durante el intervalo entre dos estímulos, el primero que sirve de aviso y el segundo que sirve de estímulo imperativo y al que el sujeto debe responder de forma externa o encubierta. La VNC comienza después del último componente positivo del potencial evocado correspondiente al primer estímulo (E1) -entre 200 y 400 milisegundos- y termina abruptamente con la presentación del segundo estímulo (E2). La amplitud máxima alcanzada es superior a la de otros componentes de los potenciales evocados, aproximadamente entre 20 y 40 microvoltios. La duración y topografía depende del lapso que separa los dos estímulos. Generalmente es de un segundo, aunque se han observado VNC incluso con lapsos entre estímulos de 20 segundos.
* Datos: Q5165363 (es)
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- The contingent negative variation (CNV) is a negative slow surface potential, as measured by electroencephalography (EEG), that occurs during the period between a warning stimulus or signal and an imperative ("go") stimulus. The CNV was one of the first event-related potential (ERP) components to be described. The CNV component was first described by W. Grey Walter and colleagues in an article published in Nature in 1964. The importance of this finding was that it was one of the first studies which showed that consistent patterns of the amplitude of electric responses could be obtained from the large background noise which occurs in EEG recordings and that this activity could be related to a cognitive process such as expectancy. (en)
- La variación negativa contingente (VNC) es un cambio de potencial [evocado promediado] negativo lento y de larga duración que se desarrolla sobre la región frontocentral del cerebro durante el intervalo entre dos estímulos, el primero que sirve de aviso y el segundo que sirve de estímulo imperativo y al que el sujeto debe responder de forma externa o encubierta. La VNC comienza después del último componente positivo del potencial evocado correspondiente al primer estímulo (E1) -entre 200 y 400 milisegundos- y termina abruptamente con la presentación del segundo estímulo (E2). (es)
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- Variación contingente negativa (es)
- Contingent negative variation (en)
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