When it comes to the theories of emotions Darwin said that our body movements and our facial expressions are used to communicate meaning. Darwin also went on to suggest are first learned, then goes on to being something that we just do without thought for survival. This can be explained easier with an example in terms of two dogs. If you have a dog at your house and somebody brings their dog over for the first time if you watch them you will see the dog that is visiting for the first time lower themselves in a submissive way, their way of telling the other that they know it is their house and that they just want to play.
Now James-Lange theory on emotion states that emotions do not happen because of the way we interpret a situation but that our emotions happen after our bodies have responded to the way we interpreted the situation. The way to be able to understand this would be explaining that if you had gotten in an argument with someone, it is not the argument that is making you feel angry but that you are feeling angry because you are responding to the reaction of your body.
We could stop there but even Cannon-Bard had their own theory about emotion. They agreed that emotion was not because of the way your body was reacting to a situation by acting with your body. For example they are saying that you are not angry because of the way your body is reacting to the argument but angry because of the argument. After learning about all those theories you then go on to learn about the Limbic system which is said to be involved in our emotions as well as our motivations.
References:
John P.J., P. (2011). Biopsychology (8th ed.). Boston, Massachusetts:
References: John P.J., P. (2011). Biopsychology (8th ed.). Boston, Massachusetts: Pearson.