Abstract
An induced wave is produced in the olfactory bulb by applying odorous or electrical stimulation on the olfactory epithelium of the frog. The effect of various sensory stimulations on the induced wave was studied.
As sensory stimuli, cutaneous, visual, gustatory and auditory stimuli were used.
The following results and conclusions were obtained in these experiments:
1) The induced waves were inhibited by the application of pain and warmth to the skin, light to the eye and sound to the ear. They were also inhibited by the application of sodium chloride, cane sugar, acetic acid and quinine solution on the tongue.
2) The induced waves, on the other hand, were generally augmented by the application of touch and cold on the skin as well as distilled water on the tongue.
3) These findings support the view that there are facilitatory and inhibitory fibers in the centrifugal nervous system from the higher brain centers to the olfactoly bulb.
4) The biological function of these two fiber systems was considered. It is supposed that the inhibition found above occured because of the diversion of attention, whereas the augmentation was probably the result of the enhancement of general attention.
