oculogyral illusion
noun
                                                                                                                            
                                                            oc·u·lo·gy·ral illusion
                    
                                                                                                              
                                                                                                                                  ˌäk-yə-lō-ˌjī-rəl-  
                                                      
                                                          
            
                                
              
          
                                                      : the apparent motion of an object that is fixed in relation to an observer whose semicircular canals have been stimulated by rotational motion                                      
                
called also oculogyric illusion
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  Merriam-Webster unabridged




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