Modern neuroscience no longer views the brain as a collection of separate regions, each performing an independent function. Instead, it is now understood as a complex, dynamic network made up of numerous neural networks that continuously communicate with one another. When a person thinks, learns, remembers, makes a decision, or solves a problem, it is not just one region that works; dozens of brain regions cooperate at the same time to exchange information at very high speed. Understanding these networks is considered one of the major achievements of neuroscience in recent decades because it has helped scientists explain many mental and behavioral functions that could not be understood by studying each brain region separately.
Modern brain-imaging techniques, such as functional magnetic resonance imaging (fMRI), have shown that certain brain regions repeatedly become active together while performing specific tasks, even when they are anatomically far apart. This led to the concept of Brain Networks, which are groups of neural regions that work together in a coordinated manner to perform a specific mental function. This concept is a cornerstone of network neuroscience because it explains how the brain can combine perception, memory, emotions, attention, planning, and decision-making at the same time.
Among the dozens of networks identified by scientists, three major networks are considered particularly influential in many everyday mental activities: the Default Mode Network (DMN), the Central Executive Network (CEN), and the Salience Network (SN). Healthy cognitive performance depends on the ability of these networks to cooperate and switch between one another continuously according to the demands of the situation a person is experiencing.
For a long time, scientists believed that each region of the brain was responsible for a specific and independent function, such as one region for vision, another for language, and a third for movement. Although this concept helped explain many brain functions, it was not sufficient to explain complex mental processes such as intelligence, creativity, consciousness, decision-making, and learning. With the development of modern brain-imaging techniques, it became clear that most mental functions do not depend on a single region, but rather on integrated neural networks made up of several regions that work together in a coordinated manner.
A brain network refers to a group of brain regions that become active at the same time and continuously exchange information to achieve a particular function. These regions may be located next to one another or far apart within the brain, but they are connected through complex neural pathways that allow them to function as a single system. Therefore, thinking, learning, memory, attention, emotions, and decision-making are not functions belonging to a single region, but rather the result of continuous cooperation between several brain networks.
The brain contains a large number of neural networks, but some operate more frequently than others, especially during everyday activities. The level of activity of each network varies according to the task a person is performing, and networks can also switch roles within fractions of a second. When a person shifts from reflecting on their thoughts to solving a mathematical problem, or from focusing on work to responding to a sudden danger, the brain automatically reorganizes the activity of these networks to achieve the best possible performance.
This discovery was made possible by functional brain-imaging techniques, particularly functional magnetic resonance imaging (fMRI), which allows scientists to observe active brain regions while people are thinking or performing different tasks. Researchers noticed that certain regions repeatedly became active together, even when they were located far apart within the brain, indicating that they formed a single functional network working toward a specific goal.
Computer science, network theory, and artificial intelligence also helped analyze millions of data points generated by brain imaging, making it possible to create detailed maps of neural networks and understand how they interact with one another during different mental activities.
Scientists have identified dozens of brain networks, but three of them are considered particularly influential in many everyday mental activities: the Default Mode Network, the Central Executive Network, and the Salience Network. Together, these networks form an integrated system that regulates internal thinking, concentration, attention, decision-making, and interaction with the surrounding environment.
The brain does not operate as a collection of independent parts, but as an integrated system of neural networks that continuously exchange information. Every mental activity, no matter how simple it may appear, is actually the result of cooperation between a large number of these networks. Therefore, understanding brain networks is an essential step toward understanding how the human mind works and how learning, productivity, mental health, and overall cognitive performance can be improved.
The Default Mode Network (DMN) is one of the most important neural networks discovered by modern neuroscience, and its discovery brought about a major shift in our understanding of how the brain works. Contrary to the old belief that the brain enters a state of "rest" when a person stops performing a particular task, studies have shown that the brain remains significantly active even during rest, and that a specific group of brain regions works together automatically when attention is not directed toward the external world. This group was called the "Default Mode Network" because it represents the brain's default state of activity during relaxation or internal thinking.
This network becomes active when a person sits quietly, lets their mind wander, recalls memories, thinks about the future, reflects on their personality, or imagines situations that have not yet happened. Therefore, it is considered a network that plays a major role in internal thinking, the development of personal identity, self-understanding, reflection, and connecting past experiences with current experiences.
The activity of this network does not mean that a person is doing nothing. On the contrary, during these moments, the brain is engaged in reorganizing information, connecting memories, analyzing past experiences, and preparing for the future. This is why new ideas or creative solutions often emerge while walking, showering, or before sleep, when external demands decrease and the activity of the Default Mode Network increases.
The activity of this network increases when a person is not focused on an external task that requires a high level of attention. This occurs during relaxation, daydreaming, meditation, thinking about the past, planning for the future, or when the mind is allowed to move freely between different thoughts.
In contrast, the activity of this network decreases when a person begins focusing on a task that requires attention and problem-solving, at which point control gradually shifts toward the Central Executive Network, which we will discuss in the following section.
Despite the importance of this network, prolonged activity without sufficient balance with other networks may contribute to certain psychological and cognitive difficulties. A person may become absorbed in excessive thinking, ruminating over negative memories, worrying about the future, or constantly blaming themselves, which may increase the risk of stress, anxiety, and depression in some individuals.
For this reason, a healthy brain seeks to maintain a continuous balance between the internal thinking performed by this network and the focus on the external world handled by other networks.
Modern studies indicate that the Default Mode Network is not merely a "resting" network, but plays an important role in organizing self-related knowledge, memory, creativity, imagination, and understanding social relationships. Research has also shown that disruptions in the activity of this network are associated with several psychological and neurological disorders, such as depression, attention-deficit/hyperactivity disorder (ADHD), Alzheimer's disease, and some autism spectrum disorders, making it an important focus of modern neuroscience research.
The Default Mode Network represents the system responsible for a person's internal world. It helps retrieve memories, understand oneself, plan for the future, and connect past experiences with present life. The problem is not the activity of this network itself, but the lack of balance between it and other networks. When it operates in balance with the Central Executive Network and the Salience Network, a person becomes better able to engage in deep thinking, creativity, and appropriate decision-making while maintaining focus on reality when necessary.
The Central Executive Network (CEN) is the network responsible for logical thinking, problem-solving, decision-making, planning, focus, and behavioral control. While the Default Mode Network manages a person's internal world, the Central Executive Network manages their interaction with the external world when they need to perform a task that requires attention and concentration. It is therefore sometimes referred to as the goal-directed thinking network, because it becomes active when a person is required to accomplish a specific task or reach a particular goal.
This network relies heavily on the prefrontal cortex, the most highly developed region of the human brain, which gives humans the ability to think abstractly, plan for the future, evaluate consequences, regulate emotions, and resist impulses. For this reason, the Central Executive Network is considered one of the most important networks that distinguishes humans from most other organisms.
When a person begins performing a task that requires a high level of concentration, such as studying a new subject, solving a mathematical problem, writing a report, or driving on a busy road, activity in the Default Mode Network gradually decreases, while activity in the Central Executive Network increases to direct mental resources toward the current task and reduce the influence of internal and external distractions.
This network becomes active whenever a person needs to exert conscious mental effort. It operates during studying, exams, programming, writing reports, managing projects, making financial decisions, negotiating, learning new skills, and playing strategic games such as chess, as well as during any task that requires organized thinking and sustained attention.
This network also helps resist distractions and keep attention directed toward the goal, even when internal thoughts or external influences may interfere with performance.
When the efficiency of the Central Executive Network decreases, it becomes more difficult to maintain concentration for long periods, and a person may experience difficulty organizing thoughts, planning, resisting distractions, or making appropriate decisions. Impulsivity may also increase, behavioral control may decline, and switching from one task to another may become more difficult.
Studies indicate that reduced regulation of this network is associated with several neurological and psychological conditions, such as Attention-Deficit/Hyperactivity Disorder (ADHD), certain injuries to the frontal lobe, and some forms of aging that affect executive functions.
Recent research shows that the strength of the Central Executive Network is strongly associated with academic success, professional productivity, learning ability, and flexibility in problem-solving. Studies also suggest that mental training, continuous learning, adequate sleep, and regular physical activity can improve the efficiency of this network over time, whereas chronic stress, insufficient sleep, and excessive multitasking can reduce its efficiency.
The Central Executive Network represents the brain's mental command center, allowing a person to think in an organized manner, make decisions, focus on goals, and control behavior. When this network functions efficiently, a person becomes better able to learn, produce, solve problems, and achieve goals. When it becomes less efficient, however, a person may struggle with concentration, organization, and self-control, even when their basic cognitive abilities remain intact.
The Salience Network (SN) is one of the most important neural networks in the brain because it acts as a manager or coordinator between different brain networks. Its primary function is not thinking, planning, or retrieving memories, but rather determining what is important at the present moment and then directing the brain's resources toward it. It can therefore be considered an early-warning system that continuously monitors the internal and external environment and determines whether attention should remain focused on the current task or shift toward a more important event.
Every second, the brain receives a tremendous amount of information from the senses, in addition to thoughts, memories, emotions, and signals coming from the body's organs. If a person attempted to process all of this information with the same level of attention, they would become unable to focus or make decisions. This is where the Salience Network plays its role: it rapidly filters this information and determines which signals deserve immediate attention and which can be ignored or postponed.
This network also plays a central role in switching between the Default Mode Network (DMN) and the Central Executive Network (CEN). When the brain detects an important event that requires concentration, the Salience Network sends signals that reduce activity in the Default Mode Network and increase activity in the Central Executive Network, directing attention toward the new task or situation.
This network becomes active whenever a new or unexpected event appears that requires rapid evaluation. The event may be a loud sound, the smell of smoke, someone calling your name, an important message on your phone, or a sudden change while driving. In all of these situations, the Salience Network determines within fractions of a second whether the event deserves a shift in attention.
Its role is not limited to detecting threats; it also helps identify important opportunities, such as noticing a new idea during a meeting, spotting an error in a report, or recognizing information that could help solve a complex problem.
If the Salience Network becomes excessively active, a person may begin to perceive many ordinary situations as threats or events that deserve concern, which can lead to increased stress and anxiety and difficulty relaxing. On the other hand, if its activity is excessively reduced, a person may have difficulty noticing important information or may respond too slowly to situations that require rapid attention.
Some studies suggest that dysregulation of this network may be associated with several neurological and psychological conditions, such as anxiety disorders, depression, Attention-Deficit/Hyperactivity Disorder (ADHD), some autism spectrum disorders, and schizophrenia. However, these conditions generally result from interactions among multiple brain networks rather than from a single network alone.
Recent research indicates that the Salience Network serves as a major link between the brain's large-scale networks, helping the brain select the most appropriate network for each situation. Studies also show that the efficiency of this network is associated with attentional speed, cognitive flexibility, and the ability to adapt to changing environments, while its dysregulation may lead to difficulties in regulating attention or correctly evaluating the importance of information.
The Salience Network represents the brain's intelligent monitoring system. It determines what deserves attention and when the brain should shift from internal thinking to external focus, or vice versa. Through this central role, it ensures that the brain uses its resources efficiently and focuses on the most important information at any given moment, making it an essential component of attention, decision-making, and adaptation to the surrounding environment.
Although each of the three networks performs specialized functions, the brain does not allow them to operate independently or separately. Instead, effective mental performance depends on their continuous cooperation. At every moment, the brain receives millions of signals coming from the external environment and from within the body, and then determines which network should be more active according to the current situation. For this reason, thinking, learning, decision-making, problem-solving, creativity, and social interaction are not the result of the activity of a single network, but rather of the precise coordination between the Default Mode Network (DMN), the Central Executive Network (CEN), and the Salience Network (SN).
These networks can be compared to three departments within a large organization. The Default Mode Network represents the planning and internal-thinking department that analyzes past experiences, imagines the future, and develops new ideas. The Central Executive Network represents executive management, which turns plans into actions, organizes work, makes decisions, and maintains focus. Meanwhile, the Salience Network acts as an operations manager that continuously monitors the environment and determines when to shift from internal thinking to external focus, or vice versa, according to what is happening in the present moment.
This switching occurs with remarkable speed that a person may not even consciously notice, as the three networks can change their patterns of activity within fractions of a second. This is why human thinking appears smooth and natural, even though the brain is continuously reorganizing its activity without stopping.
When a person is relaxed or lost in thought, the Default Mode Network is the most active, as the brain becomes engaged in retrieving memories, planning for the future, reflecting, or developing new ideas. If an important event occurs, the Salience Network quickly intervenes to evaluate it. If it determines that the event deserves attention, it reduces activity in the Default Mode Network and increases activity in the Central Executive Network so that the brain can direct all of its resources toward dealing with the new task.
After the task is completed, the brain gradually returns to its internal activity. The Default Mode Network resumes its role, and the person begins reviewing what happened, analyzing its outcomes, and connecting it with previous experiences.
Imagine that you are sitting at home thinking about your future plans. At this moment, the Default Mode Network is dominant. Suddenly, your phone rings, indicating an incoming call from your manager at work. The Salience Network detects that there is an event that deserves attention, so it directs the brain to stop its internal thinking and activate the Central Executive Network. You then begin focusing on the call, understanding the information, and making appropriate decisions. After the call ends, the brain returns to thinking about what happened, analyzing its outcomes, and planning the next steps.
Healthy mental performance depends on maintaining a continuous balance between these networks. If the Default Mode Network dominates for too long, a person may become absorbed in daydreaming, excessive thinking, or ruminating over negative memories, which can reduce their ability to accomplish tasks. On the other hand, if the Central Executive Network remains continuously active without periods of rest, this may lead to mental fatigue, reduced creativity, and increased psychological stress. Dysregulation of the Salience Network may also cause a person to overestimate the importance of certain events or fail to notice important information at the appropriate time.
For this reason, a healthy brain does not depend on the strength of a single network, but rather on its ability to flexibly switch between them according to the demands of each situation.
Recent neuroscience studies indicate that the quality of mental performance is strongly associated with the efficiency of communication between these three networks rather than with the strength of activity in any single network. Research has also shown that many neurological and psychological disorders are associated with disruptions in the way these networks interact, rather than with a problem in a single brain region, reflecting the complex network-based nature of the human brain.
Intelligence, creativity, focus, and decision-making do not depend on a single brain network, but on the continuous cooperation between the Default Mode Network, the Central Executive Network, and the Salience Network. The flexibility with which the brain switches between these networks determines a person's ability to think deeply, focus when necessary, respond quickly to changes, and maintain a balance between internal reflection and effective interaction with the external world. This cooperation is one of the key principles underlying modern neuroscience's explanation of how the human brain works.
The human brain is one of the most complex systems in the known universe, and it does not perform its functions through separate regions operating independently. Instead, it relies on an integrated network of neural connections that continuously cooperate to produce thinking, learning, memory, emotions, decision-making, and behavior. Modern discoveries in neuroscience have transformed the way we understand the brain, which is now viewed as a dynamic system of cooperating networks rather than simply a collection of isolated centers.
Throughout this article, we explored three of the most important neural networks that humans rely on in everyday life. We saw how the Default Mode Network (DMN) supports internal thinking, memory retrieval, future planning, and creativity, while the Central Executive Network (CEN) is responsible for focus, problem-solving, decision-making, and goal achievement. We also explored the central role played by the Salience Network (SN) in identifying the most important information, directing attention, and regulating the transition between the other networks.
The strength of the brain does not lie in the activity of any single network, but in its ability to maintain continuous balance and coordination between them according to the demands of each situation. When this cooperation is organized and flexible, a person becomes better able to learn, focus, create, adapt to change, make higher-quality decisions, and maintain psychological and mental well-being.
Neuroscience continues to discover new details every year about how these networks interact, opening broad possibilities for understanding human behavior, developing educational methods, improving cognitive performance, and treating many neurological and psychological disorders. Understanding brain networks is an essential step for anyone who wants to understand how the human mind works from a modern scientific perspective.
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