K. LISSAK AND E. ENDROCZI 3O5 



Institute in experiments on cats after diencephalic stimulation. Further- 

 more, it was interesting to sec what changes in behaviour were elicited in 

 the dogs by stimulation outside the conditioned reflex chamber. The 

 experiments resulted in the surprising observation that in the new situa- 

 tion either a simple orientation reflex or a dominant conditioned reflex 



Fig. II 

 Schematic illustration of cross-section of dog's brain 

 at the mesencephalic level. Numbers show the points 

 of stimulation eliciting positive conditioned reactions. 

 (BIC: brachium of inferior colliculus; CC: corpus 

 callosum; H: hippocampus; LGP: lateral geniculate 

 body, pars post.; MG: Medial geniculate body; OT 

 optic tract; P: posterior nucleus and pyramid; PC 

 post, commissure; PL: pulvinar; PRE: prctectum; RN 

 red nucleus; SN: substantia nigra.) 



corresponding to the new environment appeared. Thus, the animal lay 

 down or sat down or gave its paw to the observer, which corresponded to 

 a conditioned reflex learned before. An interesting result was obtained in 

 the course of these observations by Lissak and Endroczi (1959) when 

 stimulation was carried out in the neurotic state. In animals in which 



