Head pitch movement and vestibular neuronal activity in response to otolith stimulation of monkeys in space.

Head pitch movement and vestibular neuronal activity of two Bion 11 monkeys exposed to otolith stimulation were investigated. During flight both parameters went through facilitation and inhibition followed by enhancement. The resultant data suggest involvement of the visual input in the above changes.

Cardiac rhythm responses to otolith stimulation of monkeys in microgravity.

Cardiac rhythm responses to otolith stimulation were investigated in two Bion 11 monkeys during flight (Z axis) and before and after flight (X axis). Cardiac rhythm responses were found to change in microgravity due to variations in the excitation of vestibular structures and vagal control of cardiac function.