The Kuleshov Effect is a film editing effect that makes the audience think that the actress in the first scene is somehow impacted from what he sees.
Basically, the actress is shot in front of a plain background so that the attention will not be lost. All she does is to look with empty and emotionless eyes.She stands still and her eyes are only thing that move. Then, some other shots are taken which they have emotion in them (like a happy child, an injured cat or a beautiful girl). Between each desire creating shot, the actress is shown.
When the scenes moves through a emotional one to the actress, each time the actress seems to feel for what she saw.
For instance, after the first scene of happy child, and then the actress, the audience assumes that the actress looked happy. Infact, the actress has shot just once in the beginning of the movie and the same shots are used between the emotion rising scenes. Thus, even though the actress has looked with a blank face, the audience is highly convinced that she has desires and feelings.