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Inui K, Takeuchi N, Borgil B, Shingaki M, Sugiyama S, Taniguchi T, Nishihara M, Watanabe T, Suzuki D, Motomura E, Kida T. Age and sex effects on paired-pulse suppression and prepulse inhibition of auditory evoked potentials. Front Neurosci 2024; 18:1378619. [PMID: 38655109 PMCID: PMC11035799 DOI: 10.3389/fnins.2024.1378619] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2024] [Accepted: 03/28/2024] [Indexed: 04/26/2024] Open
Abstract
Responses to a sensory stimulus are inhibited by a preceding stimulus; if the two stimuli are identical, paired-pulse suppression (PPS) occurs; if the preceding stimulus is too weak to reliably elicit the target response, prepulse inhibition (PPI) occurs. PPS and PPI represent excitability changes in neural circuits induced by the first stimulus, but involve different mechanisms and are impaired in different diseases, e.g., impaired PPS in schizophrenia and Alzheimer's disease and impaired PPI in schizophrenia and movement disorders. Therefore, these measures provide information on several inhibitory mechanisms that may have roles in clinical conditions. In the present study, PPS and PPI of the auditory change-related cortical response were examined to establish normative data on healthy subjects (35 females and 32 males, aged 19-70 years). We also investigated the effects of age and sex on PPS and PPI to clarify whether these variables need to be considered as biases. The test response was elicited by an abrupt increase in sound pressure in a continuous sound and was recorded by electroencephalography. In the PPS experiment, the two change stimuli to elicit the cortical response were a 15-dB increase from the background of 65 dB separated by 600 ms. In the PPI experiment, the prepulse and test stimuli were 2- and 10-dB increases, respectively, with an interval of 50 ms. The results obtained showed that sex exerted similar effects on the two measures, with females having stronger test responses and weaker inhibition. On the other hand, age exerted different effects: aging correlated with stronger test responses and weaker inhibition in the PPS experiment, but had no effects in the PPI experiment. The present results suggest age and sex biases in addition to normative data on PPS and PPI of auditory change-related potentials. PPS and PPI, as well as other similar paradigms, such as P50 gating, may have different and common mechanisms. Collectively, they may provide insights into the pathophysiologies of diseases with impaired inhibitory function.
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Affiliation(s)
- Koji Inui
- Department of Functioning and Disability, Institute for Developmental Research, Aichi Developmental Disability Center, Kasugai, Japan
- Section of Brain Function Information, National Institute for Physiological Sciences, Okazaki, Japan
| | | | - Bayasgalan Borgil
- Department of Functioning and Disability, Institute for Developmental Research, Aichi Developmental Disability Center, Kasugai, Japan
| | - Megumi Shingaki
- Department of Functioning and Disability, Institute for Developmental Research, Aichi Developmental Disability Center, Kasugai, Japan
| | - Shunsuke Sugiyama
- Department of Psychiatry, Gifu University Graduate School of Medicine, Gifu, Japan
| | - Tomoya Taniguchi
- Department of Anesthesiology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Makoto Nishihara
- Multidisciplinary Pain Center, Aichi Medical University, Nagakute, Japan
| | - Takayasu Watanabe
- Department of Clinical Laboratory, Mie University Hospital, Tsu, Japan
| | - Dai Suzuki
- Department of Neuropsychiatry, Mie University Graduate School of Medicine, Tsu, Japan
| | - Eishi Motomura
- Department of Neuropsychiatry, Mie University Graduate School of Medicine, Tsu, Japan
| | - Tetsuo Kida
- Department of Functioning and Disability, Institute for Developmental Research, Aichi Developmental Disability Center, Kasugai, Japan
- Section of Brain Function Information, National Institute for Physiological Sciences, Okazaki, Japan
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Takeuchi N, Fujita K, Taniguchi T, Kinukawa T, Sugiyama S, Kanemoto K, Nishihara M, Inui K. Mechanisms of Short- and Long-Latency Sensory Suppression: Magnetoencephalography Study. Neuroscience 2023; 514:92-99. [PMID: 36435478 DOI: 10.1016/j.neuroscience.2022.11.016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2022] [Revised: 11/13/2022] [Accepted: 11/17/2022] [Indexed: 11/24/2022]
Abstract
Prepulse inhibition (PPI) is sensory suppression whose mechanism (i.e., whether PPI originates from specific inhibitory mechanisms) remains unclear. In this study, we applied the combination of short-latency PPI and long-latency paired pulse suppression in 17 healthy subjects using magnetoencephalography to investigate the mechanisms of sensory suppression. Repeats of a 25-ms pure tone without a blank at 800 Hz and 70 dB were used for a total duration of 1600 ms. To elicit change-related cortical responses, the sound pressure of two consecutive tones in this series at 1300 ms was increased to 80 dB (Test). For the conditioning stimuli, the sound pressure was increased to 73 dB at 1250 ms (Pre 1) and 80 dB at 700 ms (Pre 2). Six stimuli were randomly presented as follows: (1) Test alone, (2) Pre 1 alone, (3) Pre 1 + Test, (4) Pre 2 + Test, (5) Pre 2 + Pre 1, and (6) Pre 2 + Pre 1 + Test. The inhibitory effects of the conditioning stimuli were evaluated using N100m/P200m components. The results showed that both Pre 1 and Pre 2 significantly suppressed the Test response. Moreover, the inhibitory effects of Pre 1 and Pre 2 were additive. However, when both prepulses were present, Pre 2 significantly suppressed the Pre 1 response, suggesting that the Pre 1 response amplitude was not a determining factor for the degree of suppression. These results suggested that the suppression originated from a specific inhibitory circuit independent of the excitatory pathway.
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Affiliation(s)
- Nobuyuki Takeuchi
- Neuropsychiatric Department, Aichi Medical University, Nagakute 480-1195, Japan; Department of Psychiatry, Okazaki City Hospital, Okazaki 444-8553, Japan.
| | - Kohei Fujita
- Neuropsychiatric Department, Aichi Medical University, Nagakute 480-1195, Japan
| | - Tomoya Taniguchi
- Department of Anesthesiology, Nagoya University, Nagoya 466-8550, Japan
| | - Tomoaki Kinukawa
- Department of Anesthesiology, Nagoya University, Nagoya 466-8550, Japan
| | - Shunsuke Sugiyama
- Department of Psychiatry and Psychotherapy, Gifu University, Gifu 501-1193, Japan
| | - Kousuke Kanemoto
- Neuropsychiatric Department, Aichi Medical University, Nagakute 480-1195, Japan
| | - Makoto Nishihara
- Neuropsychiatric Department, Aichi Medical University, Nagakute 480-1195, Japan; Multidisciplinary Pain Center, Aichi Medical University, Nagakute 480-1195, Japan
| | - Koji Inui
- Department of Functioning and Disability, Institute for Developmental Research, Aichi Developmental Disability Center, Kasugai 480-0392, Japan
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Fujita K, Takeuchi N, Sugiyama S, Inui K, Fujita Y, Yamaba A, Kamiya T, Kanemoto K, Nishihara M. Relationship of loudness-dependent auditory evoked potentials with change-related cortical responses. PLoS One 2022; 17:e0277153. [PMID: 36342917 PMCID: PMC9639826 DOI: 10.1371/journal.pone.0277153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2022] [Accepted: 10/20/2022] [Indexed: 11/09/2022] Open
Abstract
Previous studies have suggested that change-related cortical responses are phenomena similar to the onset response and could be applied to the loudness dependence of auditory evoked potential (LDAEP) paradigm. In the present study, we examined the relationship between LDAEP and the change-related response using electroencephalography findings in 50 healthy subjects. There were five conditions (55, 65, 75, 85, and 95 dB) for LDAEP and five similar conditions (abrupt sound pressure increase from 70 to 75, 80, 85, 90, and 95 dB) for the change-related response. Both the onset and abrupt sound pressure increase evoked a triphasic response with peaks at approximately 50 (P50), 100 (N100), and 200 (P200) ms. We calculated the peak-to-peak amplitudes for P50/N100 and N100/P200. Medians and slopes for P50/N100 and N100/P200 amplitudes were calculated and compared between the two measures. Results revealed a significant correlation for both the slope and median for P50/N100 (r = 0.36, 0.37, p = 1.0 × 10−2, 7.9 × 10−3), N100/P200 (r = 0.40, 0.34, p = 4.0 × 10−3, 1.6 × 10−2), and P50/N100/P200 (r = 0.36, 0.35, p = 1.0 × 10−2, 1.3 × 10−2). These results suggested that the change-related response and LDAEP shared generation mechanisms at least partially.
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Affiliation(s)
- Kohei Fujita
- Neuropsychiatric Department, Aichi Medical University, Nagakute, Japan
- * E-mail:
| | | | - Shunsuke Sugiyama
- Department of Psychiatry and Psychotherapy, Gifu University, Gifu, Japan
| | - Koji Inui
- Department of Integrative Physiology, National Institute for Physiological Sciences, Okazaki, Japan
- Department of Functioning and Disability, Institute for Developmental Research, Aichi Developmental Disability Center, Kasugai, Japan
| | - Yuki Fujita
- Central clinical laboratory, Aichi medical university Hospital, Nagakute, Japan
| | - Ami Yamaba
- Central clinical laboratory, Aichi medical university Hospital, Nagakute, Japan
| | - Taeko Kamiya
- Central clinical laboratory, Aichi medical university Hospital, Nagakute, Japan
| | - Kousuke Kanemoto
- Neuropsychiatric Department, Aichi Medical University, Nagakute, Japan
| | - Makoto Nishihara
- Neuropsychiatric Department, Aichi Medical University, Nagakute, Japan
- Department of Psychiatry, Kamibayashi memorial Hospital, Ichinomiya, Japan
- Multidisciplinary Pain Center, Aichi Medical University, Nagakute, Japan
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