Before revision: The term "prefrontal synthesis" was later proposed for use in place of "mental synthesis" in order to emphasize the role of the PFC and further distance this type of active imagination from other types of spontaneous imagination, such as REM-sleep dreaming, day-time dreaming, hallucination, and spontaneous insight.
After revision: The term "prefrontal synthesis" was later proposed for use in place of "mental synthesis" in order to emphasize the role of the PFC and further distance this type of voluntary imagination from other types of involuntary imagination, such as REM-sleep dreaming, day-time dreaming, hallucination, and spontaneous insight.