https://j.ideasspread.org/index.php/mhs <p>Modern Health Science (MHS) is an international, double-blind peer-reviewed, open-access journal, published by IDEAS SPREAD INC. It publishes original research, applied, and educational articles in all areas of health science. It provides an academic platform for professionals and researchers to contribute innovative work in the field.<br>Authors are encouraged to submit complete, unpublished, original works that are not under review in any other journals.<br>The journal is published in both print and online versions. The online version is free access and download.</p> IDEAS SPREAD INC en-US Modern Health Science 2576-7291 <p>Copyright for this article is retained by the author(s), with first publication rights granted to the journal.<br>This is an open-access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/4.0/).</p> https://j.ideasspread.org/index.php/mhs/article/view/1578 <p class="text">Objective:</p> <p class="text">The utricle is commonly understood to detect gravity and horizontal linear acceleration. We hypothesized that it may also respond to vertical linear acceleration, horizontal angular acceleration, and centrifugal force.</p> <p class="text">Methods:</p> <p class="text">We performed six physical analogy experiments using deformable media, spring-mounted masses, and human squatting tasks (five healthy humans). Observations included deformation patterns and eye movement recordings.</p> <p class="text">Results:</p> <p class="text">(1) Submerged lead deformed the pudding, modeling gravitational deformation. (2–3) Spring-mounted masses deflected opposite to the direction of acceleration. (4) Human vertical motion did not elicit nystagmus. (5) Sudden rotation caused tangential deflection. (6) Constant-speed circular motion led to outward (centrifugal) deflection.</p> <p class="text">Conclusion:</p> <p class="text">The utricle can detect four distinct forces—gravity, horizontal and vertical linear acceleration, tangential angular acceleration, and centrifugal force—which suggests broader roles in postural control. Although utricular hair cells are continuously stimulated by Earth’s gravity, no nystagmus is observed under static conditions. Thus, static utricular activation alone does not elicit nystagmus. However, further studies are needed to quantify these effects and determine their physiological significance.</p> Hiroaki Ichijo Hisako Ichijo ##submission.copyrightStatement## http://creativecommons.org/licenses/by/4.0 2025-05-31 2025-05-31 8 3 p1 p1 10.30560/mhs.v8n3p1