Abstract
Short-term activity level was tested with inbred mice of four genotypes in an open-field apparatus. These data supplement earlier results for long-term exploratory activity using the same genetic stocks. The results indicate that the effects of Ay in suppressing locomotor activity are not restricted to long-term experimentation nor to a specific apparatus in mature (125 day old) Ss. Different results are found at each of the three age levels studied, however. The interpretation utilizes indirect evidence from earlier strain-difference studies and is open to experimental challenge. It is also noted that components of sexual and agonistic behavior patterns may provide stable phenotypes for behavior-genetic investigation.
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