Show Brain Wave Studies of Sleep Process New York Different parts of the brain apparently go to sleep separately sep sep- arat ly and to different degrees Drs Dra H. H Davis and P. P A. A Davis of Harv Harvard Medical school and Drs A. A L. L Loomis E. E N. N Harvey and G. G Hobart Bobart of the Loomis laboratory at Tuxedo N N. N Y have found in brainwave brain brainwave brainwave wave studies reported to the journal jour nal Science Their studies also suggest th that lt clues to the C cause luse of many mental dise diseases or abnormalIties abnormalIties' abnormalIties abnormal- abnormal lies may be found in studies of the norm normal ll falling asleep process Four kinds of br brain lin waves or electrical patterns appear during the going to sleep process they found First there is the st state l te when the person is at rest but awake Next follow different kinds of waves in the drowsy floating state A second intermediate state is characterized characterized characterized char char- by a still different brain brainwave brainwave brainwave wave pattern and this merges into the fourth pattern found in real sleep Of practical importance they point out is the f fact lct that the patterns patterns patterns pat pat- terns of early sleep in in normal persons per sons are strikingly like those seen In some mentally sick or otherwise abnormal persons Scientists makIng making mak mak- ing brain wave studies should not be misled by the pattern of an unsuspected un tin- suspected dozing or floating state into diagnosing a state of mental abnormality This similarity suggests that many abnormal ment mental ll conditions may depend on gener general ll modIfications modifications of brain function which are fundamentally like those of norm normal ll sleep |