Abstract
Inbred mice of the C57BL/6 and DBA/2 strain differed for their spontaneous locomotor activity (Animex), reactivity (somatosensory orientation) and excitability (EEG desynchronization elicited by tactile stimuli under urethane anesthesia). The C57 strain showed higher activity and reactivity expressed by the higher percentage of precise orienting responses after von Frey hair (0.5 g and 5 g) stimulation of various body areas. On the other hand C57 mice were less excitable, as demonstrated by their lower arousability slope index. This dissociation is discussed in terms of neurophysiological and neurochemical mechanisms and of their implications in relation to learning processes.
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