M. PALESTINI AND W. LIFSCHITZ 



421 



and Hagbarth, 1955), lateral geniculate body (Hernandez-Peon, Scherrer 

 and Velasco, 1956) and retina (Granit, 1955; Dodt, 1956). Experiments with 

 anaesthetics (Hernandez-Peon, Guzman, Alcaraz and Fernandez-Guar- 



HABITUATION 



NORMAL CAT 



11' FLASHES 



PRETRGEMINAL CAT 



1»J FLASHES 



FLASHES 



V-* 



'\yv-w>-^y \/-**v.*--*^l / V^ 



100 >/V 



Fig. 3 



Change in habituation rate by nndpontine transscction 



Control before the lesion in the same animal. Primary cortical photic potentials. 



Note lack of habituation and potentiation after lesion. EEG records. Time calibration 



0.5 seconds. 



diola, 1958) or mesencephalic lesions (Hernandez-Peon, 1955) also 

 showeti the reticular mesencephalic meclianisms as responsible for these 

 phenomena. 



