کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
3042821 | 1184965 | 2015 | 8 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: MMN and P300 are both modulated by the featured/featureless nature of deviant stimuli MMN and P300 are both modulated by the featured/featureless nature of deviant stimuli](/preview/png/3042821.png)
• Mismatch negativity (MMN), P3a and P3b evoked by featured deviants containing a frequency sweep within a tone were much larger than those evoked by featureless deviants.
• Behavioral discrimination performances, collected during the neurophysiological recording, were at ceiling level, even at the lowest MMN/P300 amplitudes.
• Automatic, involuntary as well as voluntary neurophysiological processes are impacted by the featured/featureless nature of the deviant stimulus.
ObjectiveThis study was designed to test the effect of the featured/featureless nature of deviant stimuli on mismatch negativity (MMN), P300 (P3a and P3b) and on behavioral discrimination performances.MethodsTen healthy adults were submitted to stimuli contrasted by the presence or absence of a frequency sweep. Discrimination performances were collected during the neurophysiological sessions.ResultsMMN, P3a and P3b were much larger for featured deviants than for featureless ones. Behavioral data (d’, at ceiling level, and reaction times) were not affected by the featured/featureless nature of the deviant stimulus.ConclusionBehavioral results and MMN amplitudes are in accordance with our previous study, using the same design albeit in an ignore condition and with collection of the behavioral data deferred until after the neurophysiological sessions. The present study strengthens previous evidence suggesting that two mechanisms contribute to the MMN evoked by featured deviants: the memory comparison process and the adaptation/fresh-afferent phenomenons.SignificanceWe here demonstrate that the neurophysiological processes underlying P300 generation are also impacted by the featured/featureless nature of the deviant stimulus and that the dissociation from behavioral data, which are not impacted, is also observed when both types of data are recorded simultaneously.
Journal: Clinical Neurophysiology - Volume 126, Issue 9, September 2015, Pages 1727–1734