Their "spontaneous activity" is not the result of "a dominating emotion" but of a desire to present dramatically certain mental pictures.

This is particularly true of dances which form a part of religious ceremonials.

As a consequence, none of these dances are improvised.

All follow forms that have been handed down through generations and have become more or less conventionalized.
When the dance portrays a personal experience the dancer is allowed a freedom of invention not elsewhere permitted.

Even in this case the dancer is obliged to follow certain conventional forms, as in the sign language; otherwise his story would not be understood.
On the eastern continent the peoples from whom we are descended had songs and dances peculiar to their different vocations, so on this western continent the song and dance were the accompaniment of the Native industries.
A study of the Indian dramatic dances shows that by means of them the vocations of men and women were lifted out of drudgery, made types of activity and allied to the forces recognized in the religious beliefs of the people.