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PubMed1984

The effect of lesions in the mesencephalic reticular formation upon conditioned avoidance responses in rat: I. Lesions of the nucleus commissurae posterioris.

After bilateral symmetric lesions of the n. commissurae posterioris (NCP) hooded rats of the Long-Evans strain did not acquire the conditioned avoidance response (CAR) in a jumping test. The NCP rats were rather unable to find out the escape possibility on the rod hanging in the middle of the apparatus. They did not learn the context between the conditioned stimulus (CS), the unconditioned stimulus (UCS) and the jump. In an Y-maze formation of CAR was even better in NCP rats than in sham-operated controls because of their shorter reaction times and their higher running speed. Their brightness discrimination, on the other hand, was significantly impaired and erroneous runs were only reduced to a low insignificant amount after more than 100 trials. Lesions in the NCP had no severe effects upon preoperatively learnt CARs, but brightness discrimination was still impaired. From these results it may be concluded that NCP plays a role in the formation of goal-directed behaviour depending on external cues and in actual visually guided behaviour.

Animals↗
PubMed1983

[Characteristics of the evoked electrical reactions of the nucleus lateralis posterior in the rabbit thalamus and their dependence on cortical and reticular formation function].

The electrical responses of n. lateralis posterior of the thalamus (nLP) to light stimuli of different intensity were recorded in alert rabbits, and their interrelationships with the reactions of retina, superior colliculi and visual cortex were analysed. The retina rather than superior colliculi appeared to play a major role in afferent supply of nLP in rabbit. The organized mechanism of facilitating reticular control of the nLP function was shown, with the adrenoreactive mechanism playing the most important role in the reticular influence. The inhibitory influence of visual and sensomotor cortical areas upon neuronal mechanism of nLP forming the responses to photostimuli, was revealed. The effects of visual cortex were the most expressive and stable.

Animals↗