General Neurology
Cervical disc disease
Aug. 18, 2023
MedLink®, LLC
3525 Del Mar Heights Rd, Ste 304
San Diego, CA 92130-2122
Toll Free (U.S. + Canada): 800-452-2400
US Number: +1-619-640-4660
Support: service@medlink.com
Editor: editor@medlink.com
ISSN: 2831-9125
Toll Free (U.S. + Canada): 800-452-2400
US Number: +1-619-640-4660
Support: service@medlink.com
Editor: editor@medlink.com
ISSN: 2831-9125
Nearly 3,000 illustrations, including video clips of neurologic disorders.
Every article is reviewed by our esteemed Editorial Board for accuracy and currency.
Full spectrum of neurology in 1,200 comprehensive articles.
Listen to MedLink on the go with Audio versions of each article.
(Jan 30, 1992) Canadian astronaut and neurologist Roberta L Bondar (b 1945), STS-42 Payload Specialist, gets into the Microgravity Vestibular Investigations (MVI) rotator chair to begin an experiment. The chair is mounted in the center aisle of the International Microgravity Laboratory 1 (IML-1) Spacelab module. Just above Bondar's head is the helmet assembly, which is outfitted with accelerometers to measure head movements, and with visors that fit over each eye independently to provide visual stimuli. The chair system has three movement patterns: (1) "sinusoidal" or traveling predictably back and forth over the same distance at a constant speed; (2) "pseudorandom" or moving back and forth over varying distances; and (3) "stepped" or varying speeds beginning and stopping suddenly. (Source: NASA/Johnson Space Center [Houston]. NASA ID: STS042-06-031. Public domain.)