PSYCHOPATHOLOGICAL RESEARCHES:
STUDIES IN MENTAL DISSOCIATION

Boris Sidis, M. A., Ph.D., M.D.
with
William A. White, M.D., George M. Parker, M.D.

© 1908
Boston: Richard G. Badger

Pneumographic tracings in the normal waking state. The first tracing is under perfectly normal conditions without any stimulations. The second tracing shows the same conditions with the only difference that the eyes were closed instead of being open. The rest of the tracings show the changes of the normal respirations under the influence of different stimuli, such as pleasant and unpleasant odors and pricking sensations.