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Currently, there is limited research exploring visual-vestibular interactions under weak vestibular stimulation. This study investigates the impact of weak inertial stimulation on visual-vestibular bimodal heading perception. A translational XY-axis motion platform equipped with a 46-inch LCD TV was utilized to generate synchronized visual and inertial stimuli. The heading perception was examined under visual-only, vestibular-only, and bimodal conditions using three levels of inertial stimuli (9\u00a0mg, 14\u00a0mg, and 19\u00a0mg). In each condition, participants were tested at nine angles (\u00b116\u00b0, \u00b19.2\u00b0, \u00b13\u00b0, \u00b11.7\u00b0, and 0\u00b0 where 0\u00b0 represents forward movement), to discern left-forward or right-forward motion. The heading discrimination threshold (HDT) was derived from participants\u2019 rightward response proportions across all angles. Our findings reveal that the HDT under 14\u00a0mg bimodal conditions is significantly higher than that under visual-only conditions (with marginal significance in the 9\u00a0mg and 19\u00a0mg conditions), indicating that the presence of weak vestibular signals might decrease the precision of bimodal heading discrimination. These results contradict the prediction of Bayesian model theory that perception is more precise under bimodal compared with unimodal conditions. The results may be explained by neurological biases during Bayesian integration, the \u201creduced visual precision\u201d theory, or increased task complexity in bimodal heading discrimination. Further research with larger sample size, extending the study to varied inertial stimuli and visual coherence levels, will be beneficial for clarifying its underlying mechanisms.<\/jats:p>","DOI":"10.1177\/09574271241305019","type":"journal-article","created":{"date-parts":[[2025,2,17]],"date-time":"2025-02-17T23:37:22Z","timestamp":1739835442000},"page":"45-55","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":2,"title":["The impact of weak inertial stimulation on visual-vestibular bimodal heading perception"],"prefix":"10.1177","volume":"35","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3766-4025","authenticated-orcid":false,"given":"Yue","family":"Wei","sequence":"first","affiliation":[{"name":"Department of Basic Psychology, School of Psychology, Shenzhen University, Shenzhen, China"},{"name":"HKUST-Shenzhen Research Institute, Shenzhen, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Beisheng","family":"Bao","sequence":"additional","affiliation":[{"name":"Department of Industrial Engineering and Decision Analytics, The Hong Kong University of Science and Technology, Hong Kong, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jingyi","family":"Xie","sequence":"additional","affiliation":[{"name":"Department of Basic Psychology, School of Psychology, Shenzhen University, Shenzhen, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Richard HY","family":"So","sequence":"additional","affiliation":[{"name":"HKUST-Shenzhen Research Institute, Shenzhen, China"},{"name":"Department of Industrial Engineering and Decision Analytics, The Hong Kong University of Science and Technology, Hong Kong, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"179","published-online":{"date-parts":[[2024,12,6]]},"reference":[{"key":"e_1_3_5_2_2","doi-asserted-by":"publisher","DOI":"10.1167\/10.11.23"},{"key":"e_1_3_5_3_2","doi-asserted-by":"publisher","DOI":"10.1016\/B978-0-12-809324-5.23879-0"},{"issue":"7","key":"e_1_3_5_4_2","first-page":"629","article-title":"Visual display lowers detection threshold of angular, but not linear, whole-body motion stimuli","volume":"60","author":"Benson AJ","year":"1989","unstructured":"Benson AJ, Brown SF. 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