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2011-12-06

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cc-by (c) Althen, H. et al., 2011
Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/96334

Fast Detection of Unexpected Sound Intensity Decrements as Revealed by Human Evoked Potentials

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http://dx.doi.org/10.1371/journal.pone.0028522

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.

Subject

Percepció auditiva, Neurofisiologia, Potencials evocats (Electrofisiologia), Electrofisiologia, Oïda

Subject (English)

Auditory perception, Neurophysiology, Evoked potentials (Electrophysiology), Electrophysiology, Hearing

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Articles publicats en revistes (Psicologia Clínica i Psicobiologia)

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ALTHEN, Heike Corinna, GRIMM, Sabine and ESCERA I MICÓ, Carles. Fast Detection of Unexpected Sound Intensity Decrements as Revealed by Human Evoked Potentials. PLoS One. 2011. Vol. 6, num. 12, pags. e28522. ISSN 1932-6203. [consulted: 12 of August of 2026]. Available at: https://hdl.handle.net/2445/96334

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