Crouching as an index of fear.
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[1] F. Colman,et al. Activity and different types of electric shock stimuli , 1967 .
[2] D. Blanchard,et al. Prolonged aftereffects of a single foot shock , 1968 .
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[1] F. Colman,et al. Activity and different types of electric shock stimuli , 1967 .
[2] D. Blanchard,et al. Prolonged aftereffects of a single foot shock , 1968 .