The behavior is the expression or action of human can be divided into 2 types.
1.External behavior (Overt Behavior): The behavior that others can be observed directly from the 5 nerve (ears, eyes, nose, mouth, and skin)
2. Internal behavior (Covert Behavior), including behavior occurs within the individual, by conscious. Normal people cannot observe the behavior of this type directly if you don't. Not expressed to is observed.(Private Experience) their only knows, for example, thought, memory, imagination, dreams, and pain