[Critical remarks on the interpretation of the thermal reaction of the labyrinth to weightlessness and evidence for the validity of the extended Bárány theory].

The literature on the biophysics of the vestibular apparatus in weightlessness is reviewed. The results of caloric in the prone position are compared to those in the supine position. The rate of convection and expansion of the endolymph are evaluated. Bárány's theory continues to be valid, because the rate of convection forms a greater proportion of the effective total stimulus than expansion.