104 PHYSICAL EXPRESSION. 



CHAPTER VII. 



PATHOLOGICAL FACTS AND EXPRESSION IN PATHO- 

 LOGICAL STATES. 



Disease may destroy or irritate parts of the brain Destruction of 

 corpus striatum Lateral deviation of the head and eyes 

 Effects of irritation in contrast with destruction of a brain 

 area Effects of disease on different sets of muscles Facial 

 palsy Localization of disease Epilepsy Chorea Analogy 

 to movements in plants Experiments with the Mimosa The 

 study of chorea Finger-twitching in nervous children 

 Tooth-grinding Headaches in children ; the physical signs 

 Cases of athetosisDefects of development; their frequent 

 coincidence. 



THERE is no intention here to enter upon a de- 

 scription of conditions of disease from a medical 

 point of view, but as direct experiments cannot 

 be made upon the living brain of man, we avail 

 ourselves of information derived from the rough 

 kind of experiments often prepared for us when 

 conditions of disease destroy or irritate certain 

 brain areas; we thus observe the effect of de- 

 struction or direct irritation of parts of the brain. 



In a case of complete hemiplegia, or paralysis of 

 one side of the body, from a lesion destroying part 



