Darwin has given the field of emotional expressions with five major contributions. It is suggested that possible explanations be given as to why he made such important and lasting contributions. Some important issues that are not considered are described. At least two of the questions have been answered in part; one remains a major void in our understanding of emotion.
The expression of feelings in humans and animals was published in 1872, a year after the descent of humans. It was originally meant as a chapter in lineage, which grew for a very long time and needed a book of its own. Darwin had begun to write the expression 2 days after correcting the pages of trials to land, and finished it in 4 months, before the sixth and final edition was compiled out of the species. Many central ideas appear in his books 1838-1839.
Before the expression, the face was primarily in the interest of those who claimed that they could read the personality or intelligence of facial attributes. Darwin ignored the characteristics and focused on visible but temporary changes in appearance.
Darwin saw emotional expression as an outward communication of an inner state and often carries the form of that expression beyond its original adaptive use. For instance, Darwin remarks that when sneering in anger, humans frequently show their canine teeth, and he suggests that this indicates that a human ancestor likely used their teeth in violent action.
It is undoubtedly a wonderful book, predicting many basics not only facial expressions but the passion itself. The expression is the first pioneering study of emotion, and in my opinion, the book should be considered what psychology has begun.
REFERENCE AND BIBLIOGRAPHIES: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2781895/