The open-field behavior of male and female guinea pigs of heterogeneous stock and age was studied in one experiment; in a second experiment six-week-old male pigs of the Hartley strain were observed. In both experiments the open-field situation tended to inhibit elimination in the open field, and in the first experiment the open-field experience also delayed elimination in the home cage after observation in the open field. Manipulation without open-field experience did not have this effect. In both studies, the animals tended to stay in the center of the open-field enclosure as the trials progressed and there was little locomotion in the open field.
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