Here a few general ones that are good starting points will soon be added. In April 1998, NASA's STS-90 mission sent a payload that included a series of experiments about the vestibular system in humans and animals. NASA's Press kit for STS-90 gives a textual overview of the entire mission that included experiments on autonomic nervous system functioning, vestibular system, sleep, mammalian development, neuronal plasticity, etc. The mission's payloads include NeuroLab itself, a remarkable collection of different experiments. Unfortunately, I don't know where the results of the studies are published.
Leads are welcome.
Medical effects of spaceflight , especially for the proposed Mars journey, include vestibular problems. The laboratory of James F. Baker at Northwestern University studies various aspects of the vestibular system. The Parmly Hearing Institute also has researchers devoted to vestibular system investigations. Oregon Health Sciences University houses links to various vestibular diseases, including motion sickness . A list of medical vestibular disorders and laws , with links to further descriptions and background, is maintained at Johns Hopkins University.