Clemente C. D. et al. Postreinforcement EEG synchronization during alimentary behavior // Electroencephalography and clinical neurophysiology. 1964. № 16. P. 335–365; Chase М. H. et al. Afferent vagal stimulation: neurographic correlates of induced EEG synchronization and desynchronization // Brain research. 1967. № 5. P. 236–249.