On the effects of cutaneous stimulations upon EEG, respiratory and muscular activities of frog.

The effects produced in the average frequency-patterns of EEGs from the olfactory bulb and forebrain of frog (Rana nigromaculata) by cutaneous pressure stimulations that are spatio-temporally constant in intensity and by repetitive tactile stimulations which are variable in intensity were observed. The changes in the respiratory movements and muscle activity produced by these stimulations were also observed and correlated with the EEG changes. In correspondence with the "inhibitory" and augmentative effects in movements, muscle tone and respiration, decrease and, respectively, increase of the EEG potentials in both the olfactory bulb and forebrain were observed during the application of the two types of stimulation. EEG potentials in the forebrain were augmented more effectively by contralateral than by ipsilateral tactile stimulation.