Septal influences on operant responding in the rat

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In 3 experiments with a total of 74 male albino Sprague-Dawley rats, the afferent and efferent connections of the septum with the hippocampus (fornix) or with the hypothalamus and lower brain stem (medial forebrain bundle) were transected by means of an encephalotome near the point where these pathways enter or leave the septal area. A transection of the fornix that produced minimal direct damage to cellular components of the septum or hippocampus reproduced the effects of large septal lesions on responding in several temporally defined paradigms that involve periods of response suppression (DRL, discriminated Sidman avoidance, FI). Transection of the medial forebrain bundle fibers that interconnect the septum with the hypothalamus and lower brain stem did not affect behavior in any of these paradigms. It is suggested that these observations be viewed in the context of the results of earlier investigations by the authors (see record 1974-27002-001), R. J. Carey (see record 1969-13784-001), and J. M. McDougall et al (see record 1969-13791-001), which showed that transection of the medial forebrain bundle reproduces several other components of the septal lesion syndrome. (28 ref) (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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