Abstract
Eight sexually inexperienced male rats were exposed to odors from female urine in 12 sessions. The stimulation was quantified and timed by letting an air stream pass over the female urine at a constant speed into a constant stream of air flowing from top to bottom through a cylindrical rat cage. The rats showed an orienting reaction to the stimulus, characterized by sniffing and directing the head and body upward into the vertical air stream. The latency of the reaction corresponded to the air travel times indicating that the response was not due to artefacts. This test procedure makes it very easy to observe the responses to changes in the olfactory quality of the air. The odor presentations were repeated until no movements appeared in three consecutive trials. Habituation occurred regularly at an average of 4 or 5 trials, with no significant change across sessions.
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