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Rabbits received ibotenic acid lesions of the thalamic reticular nucleus or the basal forebrain, or sham lesions, and had multiple-unit recording electrodes implanted in the mediodorsal nucleus of the thalamus (MD). Animals were compared on four sessions of simple Pavlovian conditioning using a tone conditioned stimulus (CS) and periorbital electric shock unconditioned stimulus (US). Eyeblink (EB) and heart rate (HR) responses were recorded, as well as multiple-unit activity (MUA) from MD. MD MUA in sham-lesioned animals showed small but consistent increases in response to the CS. Lesions of either the basal forebrain or the thalamic reticular nucleus decreased the magnitude of the MUA changes recorded from MD and impaired acquisition of the EB conditioned response (CR). Reticular nucleus, but not basal forebrain, lesions slightly enhanced the magnitude of the HR CR. Since MD’s efferent projections are to the prefrontal cortex, these results support the idea that MD, possibly due to its forebrain-reticular afferent connections, may participate in a “response selection” function of the prefrontal cortex.

psychobiology

Lesions of the thalamic reticular nucleus or the basal forebrain impair Pavlovian eyeblink conditioning and attenuate learning-related multiple-unit activity in the mediodorsal nucleus of the thalamus