Abstract
After septohippocampal damage in the rat, a growth of fibers of sympathetic origin is observed in the hippocampus. The time course of this growth parallels the changes in behavior seen after septal lesions. This study determined quantitatively which pattern of behavioral changes was most closely associated with the growth of sympathetic fibers. We found two patterns of behavioral change associated with the growing fibers. One pattern was of “recovery” behaviors, whereas the other was of “deficit” behaviors. The recovery behaviors included tactile reactivity and open-field activity. The deficit behaviors included shock and heat reactivity. In addition, we argue that the fluorescence intensity measure of sympathetic fibers that relates to neurotransmitter content is most appropriate to use in future studies of behavior, because this measure was consistently well correlated with behavioral changes.
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