What term refers to the collection of brain regions that are active during quiet rest?

The Default Mode Network (DMN) is the correct term for the collection of brain regions that are active during states of quiet rest, particularly when a person is not focused on the external environment or engaged in goal-directed tasks. This network is characterized by its activation during introspective activities such as daydreaming, recalling memories, and contemplating the future.

The DMN includes areas such as the medial prefrontal cortex, posterior cingulate cortex, and the angular gyrus, highlighting its role in self-referential thought and the integration of internal experiences. The concept of a "default mode" suggests that, even when not engaged in specific cognitive tasks, the brain is still active and involved in processing information related to the self and personal experiences.

In contrast, other options like "Active Mode Network" and "Cognitive Network" do not specifically describe the brain's activity during resting states. Meanwhile, "Resting Network" may sound relevant but does not denote the specific, recognized system of brain regions known as the Default Mode Network. Thus, understanding the DMN is essential in neuroscience to appreciate how our brains function not only during active engagement but also during moments of rest and reflection.