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Neural adaptation to silence in the human auditory cortex: a magnetoencephalographic study.
- Source :
-
Brain and behavior [Brain Behav] 2014; Vol. 4 (6), pp. 858-66. Date of Electronic Publication: 2014 Sep 30. - Publication Year :
- 2014
-
Abstract
- Introduction: Previous studies demonstrated that a decrement in the N1m response, a major deflection in the auditory evoked response, with sound repetition was mainly caused by bottom-up driven neural refractory periods following brain activation due to sound stimulations. However, it currently remains unknown whether this decrement occurs with a repetition of silences, which do not induce refractoriness.<br />Methods: In the present study, we investigated decrements in N1m responses elicited by five repetitive silences in a continuous pure tone and by five repetitive pure tones in silence using magnetoencephalography.<br />Results: Repetitive sound stimulation differentially affected the N1m decrement in a sound type-dependent manner; while the N1m amplitude decreased from the 1st to the 2nd pure tone and remained constant from the 2nd to the 5th pure tone in silence, a gradual decrement was observed in the N1m amplitude from the 1st to the 5th silence embedded in a continuous pure tone.<br />Conclusions: Our results suggest that neural refractoriness may mainly cause decrements in N1m responses elicited by trains of pure tones in silence, while habituation, which is a form of the implicit learning process, may play an important role in the N1m source strength decrements elicited by successive silences in a continuous pure tone.
Details
- Language :
- English
- ISSN :
- 2162-3279
- Volume :
- 4
- Issue :
- 6
- Database :
- MEDLINE
- Journal :
- Brain and behavior
- Publication Type :
- Academic Journal
- Accession number :
- 25365810
- Full Text :
- https://doi.org/10.1002/brb3.290