Abstract
In an earlier work the author has examined the alarm reaction of laboratory mice in the presence of an natural stressor (a cat), finding that the stressor failed to provoke fear in Ss. Results of the same kind of test with a genetically related wild species showed that the behavioral state of the house mice in the presence of a stressor differed sharply from that of their relations insofar as the house mice became blocked under the influence of stress. The experiment was carried out by means of an escape passage constructed by the author which seems suitable for psychological and genetical analyses. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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