Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/96334
Title: Fast Detection of Unexpected Sound Intensity Decrements as Revealed by Human Evoked Potentials
Author: Althen, Heike Corinna
Grimm, Sabine
Escera i Micó, Carles
Keywords: Percepció auditiva
Neurofisiologia
Potencials evocats (Electrofisiologia)
Electrofisiologia
Oïda
Auditory perception
Neurophysiology
Evoked potentials (Electrophysiology)
Electrophysiology
Hearing
Issue Date: 6-Dec-2011
Publisher: Public Library of Science (PLoS)
Abstract: The detection of deviant sounds is a crucial function of the auditory system and is reflected by the automatically elicited mismatch negativity (MMN), an auditory evoked potential at 100 to 250 ms from stimulus onset. It has recently been shown that rarely occurring frequency and location deviants in an oddball paradigm trigger a more negative response than standard sounds at very early latencies in the middle latency response of the human auditory evoked potential. This fast and early ability of the auditory system is corroborated by the finding of neurons in the animal auditory cortex and subcortical structures, which restore their adapted responsiveness to standard sounds, when a rare change in a sound feature occurs. In this study, we investigated whether the detection of intensity deviants is also reflected at shorter latencies than those of the MMN. Auditory evoked potentials in response to click sounds were analyzed regarding the auditory brain stem response, the middle latency response (MLR) and the MMN. Rare stimuli with a lower intensity level than standard stimuli elicited (in addition to an MMN) a more negative potential in the MLR at the transition from the Na to the Pa component at circa 24 ms from stimulus onset. This finding, together with the studies about frequency and location changes, suggests that the early automatic detection of deviant sounds in an oddball paradigm is a general property of the auditory system.
Note: Reproducció del document publicat a: http://dx.doi.org/10.1371/journal.pone.0028522
It is part of: PLoS One, 2011, vol. 6, num. 12, p. e28522
Related resource: http://dx.doi.org/10.1371/journal.pone.0028522
URI: http://hdl.handle.net/2445/96334
ISSN: 1932-6203
Appears in Collections:Articles publicats en revistes (Psicologia Clínica i Psicobiologia)

Files in This Item:
File Description SizeFormat 
614641.pdf609.35 kBAdobe PDFView/Open


This item is licensed under a Creative Commons License Creative Commons