Die Physiologie und Psychologie des Lachens und des Komischen. / Ein Beitrag zur experimentellen Psychologie für Naturforscher, Philosophen und gebildete Laien.

Investigates the physiological and psychological bases of laughter and what is perceived as comic, treating laughter both as a reflexive response to skin stimulation (tickling) and as a reaction to mental incongruities that affect ease of assimilation. Presents experimental observations on vascular responses and cerebral blood-pressure fluctuations, explains how rhythmic respiratory movements during laughter mitigate circulatory risks, and examines facial expression, comparative and developmental perspectives, and statistical and experimental methods to connect pathological cases with normal affective processes.