视动刺激和前庭刺激对视动错觉的交互作用

Interactionofoptokineticandvestibularstimulionvection.

目的研究受试者在视动刺激和前庭刺激（头动）同时作用下视动错觉的变化规律，分析视动错觉的变化与相应诱发的运动病之间的关系。方法受试者２６名。利用视球旋转产生视动刺激和视动错觉；以头动实现前庭刺激。错觉和头动均为三个轴向，即翻转、滚转和偏转。受试者被安排参加偏转视动组、滚转视动组和翻转视动组三个试验组。按拉丁方排列试验，每次试验持续１０ｍｉｎ。结果①在同一视动刺激条件下，头动使视动错觉发生率比头静时有降低趋势。偏转视动刺激时翻转头动和滚转头动使视动错觉发生率显著降低。此时的运动病症状显著加重。②在同一头动状态下，偏转视动错觉发生率最高，滚转视动错觉居中，翻转视动错觉最低。这一顺序与头静状态时一致。③三种头动状态下，不同种类视动错觉的强弱顺序与相应的运动病严重程度基本吻合。结论头动对视动错觉发生率有明显影响。

ObjectiveThepurposeofthisstudywastoinvestigatevectionchangesunderinter-actionofoptokineticstimuli(OS)andvestibularstimuli(Headmovements,HM),andtherelationshipbetweenvectionchangesandmotionsickness(MS).MethodsTwenty-sixvolunteersservedassub-jects.OSandvectionwasinducedbyarotatingoptokineticsphere,whilevestibularstimuliwerepro-ducedbyHM.Subjectswerearrangedtoparticipatethreegroupsofexperiments,underwentpitch,rolandyawOSrespectively.Eachtestlasted10minutes.Results①HMtendedtosuppressvectionincomparisionwithhead-stilcondition,espicialypitchHMandrolHMsignificantlysuppressedvectionunderyawOS,whileMSwasmoreseriousinthesecombinations.②UndersameHMcondition,yawvectionwasstrongerthanrolvection,whichinturnwasstrongerthanpitchvection.Thisresultcoin-cidedwiththatofhead-stilcondition.③Vectionchangeinresult②wassimilartoseverityofMSun-dersameHMcondition.ConclusionHMhassignificantinfluenceonincidenceofvection.