M. PALESTINI AND W. LIFSCHITZ 43 1 



maintenance of this permanent waking EEC rhvthm, which is better observed when 

 this nucleus is less destroyed. 



LiFSCHiTZ. I think it is interesting to compare results communicated by Dr 

 Jouvet to this symposium to our own, because it appears that we are speaking in 

 favour ot two different inhibitory or synchronizing influences, one coming from 

 the caudal part of the brain stem, and the other trom higher structures. It is possible 

 that both influences act hi these processes, perhaps at different moments. During 

 habituation an internal inhibition develops which is different trom internal inhibi- 

 tion of inhibitory or negative conditioned reflexes. It is quite possible that one of 

 these is acting in one type of internal inhibition and not hi the other. 



About Dr Galambo's remark, I think that the data we have from Moruzzi 

 stating that the 'cerveau isole' gets habituated is against the idea of an action coming 

 from rhinencephalic structures. In this case pathways coming trom the rliinen- 

 cephalon to the midbrain have been also severed, but there is a different result in 

 habituation. 



