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Kim CH, Jin SH, Kim JS, Kim Y, Yi SW, Chung CK. Dissociation of Connectivity for Syntactic Irregularity and Perceptual Ambiguity in Musical Chord Stimuli. Front Neurosci 2021; 15:693629. [PMID: 34526877 PMCID: PMC8435864 DOI: 10.3389/fnins.2021.693629] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2021] [Accepted: 07/30/2021] [Indexed: 11/18/2022] Open
Abstract
Musical syntax has been studied mainly in terms of “syntactic irregularity” in harmonic/melodic sequences. However, “perceptual ambiguity” referring to the uncertainty of judgment/classification of presented stimuli can in addition be involved in our musical stimuli using three different chord sequences. The present study addresses how “syntactic irregularity” and “perceptual ambiguity” on musical syntax are dissociated, in terms of effective connectivity between the bilateral inferior frontal gyrus (IFGs) and superior temporal gyrus (STGs) by linearized time-delayed mutual information (LTDMI). Three conditions were of five-chord sequences with endings of dominant to tonic, dominant to submediant, and dominant to supertonic. The dominant to supertonic is most irregular, compared with the regular dominant to tonic. The dominant to submediant of the less irregular condition is the most ambiguous condition. In the LTDMI results, connectivity from the right to the left IFG (IFG-LTDMI) was enhanced for the most irregular condition, whereas that from the right to the left STG (STG-LTDMI) was enhanced for the most ambiguous condition (p = 0.024 in IFG-LTDMI, p < 0.001 in STG-LTDMI, false discovery rate (FDR) corrected). Correct rate was negatively correlated with STG-LTDMI, further reflecting perceptual ambiguity (p = 0.026). We found for the first time that syntactic irregularity and perceptual ambiguity coexist in chord stimulus testing musical syntax and that the two processes are dissociated in interhemispheric connectivities in the IFG and STG, respectively.
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Affiliation(s)
- Chan Hee Kim
- Interdisciplinary Program in Neuroscience, College of Natural Science, Seoul National University, Seoul, South Korea.,Department of Neurosurgery, MEG Center, Seoul National University Hospital, Seoul, South Korea
| | - Seung-Hyun Jin
- Department of Neurosurgery, MEG Center, Seoul National University Hospital, Seoul, South Korea
| | - June Sic Kim
- Department of Neurosurgery, MEG Center, Seoul National University Hospital, Seoul, South Korea.,Research Institute of Basic Sciences, Seoul National University, Seoul, South Korea
| | - Youn Kim
- Department of Music, School of Humanities, The University of Hong Kong, Hong Kong, Hong Kong SAR China
| | - Suk Won Yi
- College of Music, Seoul National University, Seoul, South Korea.,Western Music Research Institute, Seoul National University, Seoul, South Korea
| | - Chun Kee Chung
- Interdisciplinary Program in Neuroscience, College of Natural Science, Seoul National University, Seoul, South Korea.,Department of Neurosurgery, MEG Center, Seoul National University Hospital, Seoul, South Korea.,Department of Brain and Cognitive Science, College of Natural Science, Seoul National University, Seoul, South Korea.,Department of Neurosurgery, Seoul National University Hospital, Seoul, South Korea
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