Final answer:
A psychoanalyst would focus on unconscious conflicts and early childhood experiences as the cause of the fear of the dark, while a behaviorist would approach the problem from a learning perspective, focusing on how the child's behavior is reinforced or punished by the fear.
Step-by-step explanation:
A psychoanalyst and a behaviorist would differ in their views of how this problem of a 4-year-old being frightened of the dark and refusing to go to sleep at night developed. A psychoanalyst would focus on unconscious conflicts and early childhood experiences as the cause of this fear. They might suggest that the child's fear of the dark represents a symbolic fear of the unknown or a desire for security and parental protection.
On the other hand, a behaviorist would approach this problem from a learning perspective. They would focus on how the child's behavior is reinforced or punished by the fear of the dark. For example, if the child receives attention or avoids bedtime by expressing fear, this behavior may be reinforced, leading to the continuation of the fear.