| Reference code: | PT/FB/BL-2010-037.07 |
| Location: | Arquivo PCA - Pasta 2/2010
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Title:
| Early automatic detection of intensity deviants reflected in the middle-latency range of the human electrical brain response
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| Publication year: | 2011
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URL:
| http://www.cogneurosociety.org/wordpress/wp-content/themes/CNStheme/downloads/CNS2011_Program.pdf
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| Abstract/Results: | ABSTRACT:
The violation of a regular sound pattern by irregular or novel stimuli is reflected in the mismatch negativity, a component of the human auditory evoked potential (AEP), with a latency of 100-250 ms and main sources in the auditory cortices. Evidence for auditory novelty detection however has also been reported at much shorter latencies (15 ?– 30 ms after stimulus onset) as revealed by single- and multiunit recordings in the auditory cortex and midbrain of animals. In this study, we aimed at finding traces of fast auditory novelty detection in the human AEP during a passive intensity oddball paradigm. An oddball condition using click stimuli (standard stimulus = 50 dB SL; deviant stimulus [14%] = 40 dB SL), a reversed oddball condition (standard stimulus = 40 dB SL; deviant stimulus [14%] = 50 dB SL) and a control condition (random presentation of 7 stimuli with different intensities ranging from 10-70 dB SL, 14 % probability each) were applied. The EEG was recorded from 7 scalp electrodes and the data was analyzed in the ranges of the auditory brainstem response, the middle-latency response, and the long-latency response. In the middle-latency range, deviants elicited a significantly more negative response than standards of the same intensity
at the descending slope of the Na component (21-27 ms after stimulus onset). This outcome suggests that the human auditory novelty detection system comprises fast processes which are taking place at latencies similar to those found in single- and multiunit recordings in animals.
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| Accessibility: | Document does not exist in file
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Language:
| eng
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Author:
| Althen, H.
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Secondary author(s):
| Grimm, S., Slabu, L., Escera, C.
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Document type:
| Abstract book
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Number of reproductions:
| 1
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Reference:
| Althen, H., Grimm, S., Slabu, L., & Escera, C. (2011). Early automatic detection of intensity deviants reflected in the middle-latency range of the human electrical brain response. In Abstract book of the Cognitive Neuroscience Society - 2011 Annual Meeting (pp. 35-36). San Francisco, CA.
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| Indexed document: | No
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| Keywords: | Mismatch negativity (MMN) / Auditory evoked potentials (AEPs) / Auditory novelty detection
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Early automatic detection of intensity deviants reflected in the middle-latency range of the human electrical brain response |