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Wang S, Han J, Xiao M, Shi P, Chen H. Changes in functional connectivity and structural covariance between the fronto-parietal network and medial orbitofrontal cortex are associated with disinhibition in restrained eaters. Cereb Cortex 2024; 34:bhae314. [PMID: 39073380 DOI: 10.1093/cercor/bhae314] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2024] [Revised: 06/30/2024] [Accepted: 07/12/2024] [Indexed: 07/30/2024] Open
Abstract
Disinhibition, characterized by a loss of dietary control, is a significant risk factor for diet failure and the onset of eating disorders in restrained eaters. This study employs resting-state functional connectivity and structural covariance network analyses to explore the neural associations underlying this behavior. By analyzing functional MRI data from 63 female college students, we found that increased disinhibition correlates with enhanced functional connectivity between the medial orbitofrontal cortex and key components of the inhibition system, particularly within the fronto-parietal network. Moreover, we observed a relationship between the structural covariance of the medial orbitofrontal cortex and the inferior parietal lobule and the severity of disinhibition. Importantly, the functional connectivity between the medial orbitofrontal cortex and the inferior parietal lobule predicts the severity of binge eating symptoms in these individuals. These findings indicate that imbalances in the interaction between the brain's reward and inhibition systems can lead to dietary failures and eating disorders, emphasizing the need for targeted interventions.
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Affiliation(s)
- Shaorui Wang
- Key Laboratory of Cognition and Personality (Ministry of Education), Southwest University, No. 2 Tiansheng Road, Beibei District, Chongqing, 400715, China
- School of Psychology, Southwest University, No. 2 Tiansheng Road, Beibei District, Chongqing, 400715, China
| | - Jinfeng Han
- Key Laboratory of Cognition and Personality (Ministry of Education), Southwest University, No. 2 Tiansheng Road, Beibei District, Chongqing, 400715, China
- School of Psychology, Southwest University, No. 2 Tiansheng Road, Beibei District, Chongqing, 400715, China
| | - Mingyue Xiao
- Key Laboratory of Cognition and Personality (Ministry of Education), Southwest University, No. 2 Tiansheng Road, Beibei District, Chongqing, 400715, China
- School of Psychology, Southwest University, No. 2 Tiansheng Road, Beibei District, Chongqing, 400715, China
| | - Pan Shi
- Key Laboratory of Cognition and Personality (Ministry of Education), Southwest University, No. 2 Tiansheng Road, Beibei District, Chongqing, 400715, China
- School of Psychology, Southwest University, No. 2 Tiansheng Road, Beibei District, Chongqing, 400715, China
| | - Hong Chen
- Key Laboratory of Cognition and Personality (Ministry of Education), Southwest University, No. 2 Tiansheng Road, Beibei District, Chongqing, 400715, China
- School of Psychology, Southwest University, No. 2 Tiansheng Road, Beibei District, Chongqing, 400715, China
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Li W, Chen X, Luo Y, Xiao M, Liu Y, Chen H. Altered connectivity patterns of medial and lateral orbitofrontal cortex underlie the severity of bulimic symptoms. Int J Clin Health Psychol 2024; 24:100439. [PMID: 38226007 PMCID: PMC10788814 DOI: 10.1016/j.ijchp.2024.100439] [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: 09/26/2023] [Accepted: 01/03/2024] [Indexed: 01/17/2024] Open
Abstract
Objective Compared to clinical bulimia nervosa, sub-threshold bulimic symptoms are becoming more prevalent in non-clinical or general population, which is repeatedly linked with the connectivity in orbitofrontal cortex (OFC), including functionally heterogeneous the medial and lateral OFC (mOFC; lOFC). However, the specific connectivity patterns of the mOFC and lOFC in individuals with severe or mild bulimic symptoms (SB; MB) remain poorly understood. Methods We first utilized resting-state functional connectivity (FC) and spectral dynamic causal modeling (spDCM) to investigate abnormal functional and effective connectivity (EC) of OFC subregions in adults with different severity of bulimic. The SB group (n = 21), MB group (n = 114), and healthy controls (HC, n = 91) underwent rs-fMRI scans. A generalized linear model was applied to determine the OFC-seeded whole-brain FC across the three groups. Subsequently, spDCM was used to estimate differences in EC among the three groups based on the FC results. Results We observed a shared neural basis for SB and MB groups (i.e., weaker lOFC-superior parietal lobule connectivity), which may support the role of dysfunctional inhibitory control in general bulimic symptomatology. Whereas, SB group displayed greater lOFC-occipital pole connectivity than MB group, suggesting the specificity of the neural correlates of full-threshold/severe bulimia. The directional links from the mOFC to lOFC and amygdala could further explain the aberrant interactions of reward sensitivity with inhibitory control and homeostatic energy in sub-threshold/mild condition. Conclusion The current study provides novel evidence that divergent connectivity patterns of the lOFC and mOFC may contribute to different severities of bulimia, which will expands our understanding of the neurobiological substrates underlying bulimia across a spectrum from healthy to unhealthy.
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Affiliation(s)
- Wei Li
- Key Laboratory of Cognition and Personality, Ministry of Education, Faculty of Psychology, Southwest University, Chongqing 400715, China
- Faculty of Psychology, Southwest University, Chongqing 400715, China
| | - Ximei Chen
- Key Laboratory of Cognition and Personality, Ministry of Education, Faculty of Psychology, Southwest University, Chongqing 400715, China
- Faculty of Psychology, Southwest University, Chongqing 400715, China
| | - Yijun Luo
- Key Laboratory of Cognition and Personality, Ministry of Education, Faculty of Psychology, Southwest University, Chongqing 400715, China
- Faculty of Psychology, Southwest University, Chongqing 400715, China
| | - Mingyue Xiao
- Key Laboratory of Cognition and Personality, Ministry of Education, Faculty of Psychology, Southwest University, Chongqing 400715, China
- Faculty of Psychology, Southwest University, Chongqing 400715, China
| | - Yong Liu
- Key Laboratory of Cognition and Personality, Ministry of Education, Faculty of Psychology, Southwest University, Chongqing 400715, China
- Faculty of Psychology, Southwest University, Chongqing 400715, China
| | - Hong Chen
- Key Laboratory of Cognition and Personality, Ministry of Education, Faculty of Psychology, Southwest University, Chongqing 400715, China
- Faculty of Psychology, Southwest University, Chongqing 400715, China
- Research Center of Psychology and Social Development, Faculty of Psychology, Southwest University, Chongqing 400715, China
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