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- W2020593025 abstract "Subjects were six women. They heard a warning click (W) followed by one of two tones (S1), followed again by one of two clicks (S2). In half the trials they made a choice key pressing response (R) to the tone; in half no response (NR) was required. Within these trials they made a further choice response to the click (S2) if the tone at S1 was high tone (continued expectancy, CE) but not if S1 was a low tone (non-continued expectancy, NCE). The CNV present at S1 was resolved towards the baseline whether or not an overt response had to be made to S1 and whether or not the information in S1 counselled continued expectancy. With CE this CNV resolution was arrested when a further CNV developed in preparation for S2. This created a sharp divergence of the CE trace from the NCE trace, the latter continuing its positive-going resolution. The latency at this point of CE/NCE divergence correlated positively with motor reaction time to S1 and was delayed when a motor response was required to S1. Conclusions: (1) The cause of return of CNV to baseline is neither the overt response nor the final decision concerning the nature of the stimulus, but probably the first coarse identification of the stimulus as one of a relevant class of stimuli. (2) The point of CE/NCE divergence may mark the completion of a second stage of finer analysis and may be an EEG index of final decision latency. (3) Inter-individual variance in reaction time is confined mainly to transactions before this point in processing. (4) The need to make an overt response may absorb processing capacity and therefore delay decision time. Les présentes expériences, effectuées sur 6 sujets femmes, ont consisté à associer les stimulus suivants: un clic signal (W) suivi d'un premier stimulus ‘impératif’ S1 qui: (a) tantôt impliquait une consigne immédiate de réponse motrice (R), tantôt non (NR) et (b) selon sa hauteur (haute ou basse) était suivi (CE) ou non (NCE) d'une nouvelle phase d'expectative d'un troisième stimulus impératif (S2). Les observations ont montré que la VCN présente lors de S1 revenait à la ligne de base de façon identique, qu'il y ait mouvement ou non (R, NR) et que S1 détermine ou non une nouvelle expectative (CE, NCE). Toutefois, en situation CE, le retour était interrompu par une seconde VCN, se développant en préparation de S2; le point de divergence entre les tracés CE et NE, ainsi observé, survenait significativement plus tard en situation R (mouvement à S1) qu'en situation NR, la latence correspondant dans le premier cas au temps de réaction de ce mouvement. En conclusion: (1) La cause du retour de la VCN à zéro n'est ni l'existence de la réponse (R), ni la décision d'action liée au stimulus, mais une première identification globale de celui-ci. (2) Le point de divergence des tracés de situation CE et NCE marque le départ d'une seconde étape d'analyse et pourrait constituer un indice électro-graphique de la latence de la décision finale. (3) Les variations interindividuelles qui marquent précisément la latence de ce point reflètent des variations du temps de réaction. (4) La nécessité d'effectuer une premiére réponse R semble retarder l'instant de décision et d'élaboration ultérieurs." @default.
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- W2020593025 title "Determinants of the post-stimulus resolution of contingent negative variation (CNV)" @default.
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- W2020593025 doi "https://doi.org/10.1016/0013-4694(73)90026-6" @default.
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