Subjective visual vertical in first time seafarers experiencing sea sickness

This distinctive study assessed otolith-mediated verticality perception using the SVV test in first-time seafarers experiencing sea sickness aboard a naval frigate. Our findings emphasize the functional importance of the otolith organs in maintaining spatial orientation during maritime motion exposure. The observed SVV deviations support the subjective vertical conflict theory, highlighting the role of vestibular-visual mismatch in the development of sea sickness. However, our findings more likely reflect transient functional disturbance or overstimulation rather than a pre-existing utricular asymmetry alone. Based on the pattern of SVV deviation and recovery, we propose that the utricle may play a more significant role than the saccule in inducing sea sickness.