Naturalism in acting is primarily based on what aspect of the actor?

Naturalism in acting emphasizes a strong connection between an actor's personality and the character being portrayed. This approach requires the actor to embody their character with authenticity and realism, allowing for emotional depth and believability. By drawing on their own personality traits and life experiences, actors can create a more nuanced and relatable performance that reflects genuine human behavior.

The other aspects mentioned, while they can contribute to a performance, are not the central focus of naturalism. For instance, the character's physical appearance can aid in creating a visual representation but does not necessarily affect the authenticity of the performance. The fictional emotions of the character are important for any acting style, yet naturalism cultivates a deeper realism rooted in the actor's own experiences and emotional truths. Lastly, although the director's vision guides the overall direction of a film, it is the actor's internalization of their character's personality that primarily drives the naturalistic approach.