[Resting state functional MRI of the brain].

Area of Science:

• Neuroscience
• Cognitive Science

Context:

• The human brain exhibits intrinsic functional activity even at rest.
• Resting-state functional magnetic resonance imaging (rsfMRI) measures this spontaneous neural activity.
• This activity is characterized by low-frequency fluctuations in the blood oxygenation level-dependent (BOLD) signal.

Purpose:

• To introduce the principles and applications of rsfMRI studies.
• To describe the characterization of spontaneous brain activity.
• To detail the default mode network (DMN) and other resting-state networks (RSNs).

Summary:

• rsfMRI detects low-frequency BOLD signal fluctuations (< 0.1 Hz) that correlate with neuronal activity.
• These fluctuations reflect neuronal coupling and the organization of functional brain networks.
• The default mode network (DMN), comprising medial prefrontal cortex, posterior cingulate cortex, and precuneus, is a key RSN discussed.
• Other RSNs include motor, somatosensory, visual, auditory, and cognitive networks, involving widespread brain regions.

Impact:

• Provides a foundational understanding of brain function during rest.
• Highlights the importance of spontaneous brain activity in neuroscience research.
• Establishes rsfMRI as a critical tool for mapping brain connectivity and networks.