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Fujii S, Motomura E, Inui K, Watanabe T, Hakumoto Y, Higuchi K, Kawano Y, Morimoto M, Nakatani K, Okada M. Weaker prepulse exerts stronger suppression of a change-detecting neural circuit. Neurosci Res 2020; 170:195-200. [PMID: 32702384 DOI: 10.1016/j.neures.2020.07.007] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2020] [Revised: 05/26/2020] [Accepted: 07/13/2020] [Indexed: 11/19/2022]
Abstract
Change-N1 peaking 90-180 ms after changes in a sound feature of a continuous sound is clearly attenuated by a preceding change stimulus (called a "prepulse"). Here, we investigated the effects of a preceding decrease in sound pressure on the degree of inhibition of the subsequent Change-N1 amplitude. Using 100-Hz click train sounds, we obtained Change-N1s from 11 healthy volunteers. The two types of test stimuli were an abrupt 10-dB increase from the baseline (70 dB) and the insertion of a 0.45-ms inter-aural time difference in the middle of the sound. Three consecutive clicks at 30, 40, and 50 ms before the change onset that was used as a prepulse were weaker than the background by 5 or 10 dB. The Change-N1 elicited by the two test stimuli was attenuated more strongly by the weaker prepulse, which was not congruent with the theory that the inhibition of the subsequent sensory/sensory-motor processing depends on the sound pressure level of a prepulse. These results suggest that a change in any type of sound feature elicits a change-related response that is inhibited by any type of preceding change stimulus, which reflects auto-inhibition of the change-responding circuit.
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Affiliation(s)
- Shinobu Fujii
- Department of Central Laboratories, Mie University Hospital, Tsu, Mie 514-8507, Japan
| | - Eishi Motomura
- Department of Neuropsychiatry, Mie University Graduate School of Medicine, Tsu, Mie 514-8507, Japan.
| | - Koji Inui
- Department of Functioning and Disability, Institute for Developmental Research, Aichi Developmental Disability Center, Kasugai, Aichi 480-0392, Japan
| | - Takayasu Watanabe
- Department of Central Laboratories, Mie University Hospital, Tsu, Mie 514-8507, Japan
| | - Yuhei Hakumoto
- Department of Central Laboratories, Mie University Hospital, Tsu, Mie 514-8507, Japan
| | - Keiichi Higuchi
- Department of Central Laboratories, Mie University Hospital, Tsu, Mie 514-8507, Japan
| | - Yasuhiro Kawano
- Department of Neuropsychiatry, Mie University Graduate School of Medicine, Tsu, Mie 514-8507, Japan
| | - Makoto Morimoto
- Department of Central Laboratories, Mie University Hospital, Tsu, Mie 514-8507, Japan
| | - Kaname Nakatani
- Department of Central Laboratories, Mie University Hospital, Tsu, Mie 514-8507, Japan
| | - Motohiro Okada
- Department of Neuropsychiatry, Mie University Graduate School of Medicine, Tsu, Mie 514-8507, Japan
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