[The spontaneous and evoked neuronal activity of the parietal associative cortex in cats during motion sickness]

In the experiments with the cats a spontaneous and induced activity of the neurons (57) of parietal associated cortex during motion sickness was studied. It was found that after a 15 min motion sickness 54 percent of the examined neurons displayed suppression, 20 percent of neurons did an increase of spontaneous activity. Twenty-six percent of neurons did not respond to motion sickness. The dynamics of induced neuronal responses under motion sickness effect was complex, a direction of the changes in induced responses frequently did not agree with that of alterations in a spontaneous cellular activity. The more stable changes of induced responses have been in the neurons with phase responses to the fight and electrocutaneous stimulation. After 45-min effect of motion sickness, the light-stimulated responses were characterized by an increase of early and suppression of late components of a response, and the responses to electrocutaneous stimulation displayed mainly a suppression of the early components of the responses.