Abstract
36 adult [male] and [female] rats taken from the 7th and 8th generations of 2 strains, one selectively bred for timidity, the other selectively bred for fearlessness, were measured for persistence using the paper barrier test. No differences between the 2 strains were found. Persistence and emotionality (timidity) are not related temperamental traite. The paper barrier test was shown to possess high reliability.

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