Abstract
1. 1. The transfer of an animal from a test environment (devoid of stimulating factors) into an environment containing putrid substances (fish extract or synthetic amines) produces an “awakening reaction of olfactory origin” (A.R.O.). 2. 2. The extent of that reaction is dependent on the length of time spent by the animal in the test environment between the two stimulations. 3. 3. A prolonged stay in the stimulating environment determines the duration of the reaction obtained after a stay in the test environment and the transfer into the stimulating environment. 4. 4. These results are discussed and the conclusion drawn is that, besides the thermal environment and internal physiological state, the conditions preceding stimulation must be defined to give to the awakening reaction of olfactory origin a significant value in relation to that of the stimulus.
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