Beatrice Lang
The brain is an essential organ that controls thought, memory, emotion, touch, motor skills, vision, and respiration. Neurons in the brain communicate via electrical impulses, allowing the brain to coordinate behavior, sensation, thoughts, and emotion. The brain's electrical activity can be studied by imaging neurons' electrical communications using electrodes or fluorescent sensors. The brain is divided into several parts, including the cerebrum, brainstem, and cortex, each responsible for specific functions such as movement, speech, judgment, and vision. Understanding the brain's electrical activity and its relation to various cognitive processes can help enhance learning, problem-solving, and mood regulation through techniques like tDCS.
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What You'll Learn
Neurons generate electricity through the motion of ions
Neurons are the primary components of the nervous system. They send and receive information in the form of electrical signals from the sensory organs, facilitating communication with the brain. While traditional electricity is generated by the motion of free electrons, neurons generate electrical signals through the motion of ions across the cell membrane.
Ions are charged particles that have either lost or gained electrons. When a particle loses an electron, it becomes positively charged and is called a cation. When a particle gains an electron, it becomes negatively charged and is called an anion. The difference in the net electrical charge of these ions on the inside and outside of the neuron is called the membrane potential. This difference in net electrical charge is due to the grouping of ions on opposite sides of the cell membrane. The membrane potential is a result of the difference in electrical charge across the cell membrane. The difference is caused by the grouping of ions.
The cell membrane of the nerve cell is selective in nature, only allowing some substances (ions) to pass through, while blocking the others. When in a rested state, only potassium cations (K+) can pass through the semipermeable membrane. An ion pump helps to maintain the number of ions on both sides of the membrane. The pump pushes out three sodium cations (Na+) for every two potassium cations (K+) that the membrane lets in.
The sodium channels in the neuronal membrane open in response to a small depolarization of the membrane potential. When the sodium channels open, positively charged sodium ions flood into the neuron, making the inside of the cell momentarily positively charged. This has the effect of opening the potassium channels, allowing potassium ions to leave the cell. Thus, there is first an influx of sodium ions (depolarization) followed by a rapid outflow of potassium ions (repolarization). Excess ions are subsequently pumped in and out of the neuron. This transient switch in membrane potential is the action potential.
The nerve cells transfer information by using both electrical and chemical signals. The electrical signals are used to move information within the nerve cells, whereas chemical signals are used to transfer information between two neighbouring neurons.
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Brainstem controls unconscious functions like heart rate and breathing
The brain is an incredibly complex organ, and its electrical nature is fascinating. While traditional electricity is generated by the motion of free electrons, neurons in the brain generate electrical signals through the movement of ions across the cell membrane. These ions carry a charge, and the difference in electrical charge across the cell membrane is what creates the electrical signal.
Now, onto the topic of the brainstem and its role in controlling unconscious functions like heart rate and breathing. The brainstem, located at the base of the brain, is responsible for regulating these vital processes. Specifically, the medulla oblongata, a tiny but crucial part of the brainstem, acts as a relay station, directing nerve signals throughout the body. It connects the spinal cord to the rest of the brain and controls essential functions such as heartbeat, breathing, blood pressure, and even processes like vomiting and sneezing.
The medulla oblongata, often referred to simply as the medulla, is the lowest portion of the brainstem. It is cone-shaped and situated just anterior and partially inferior to the cerebellum. This small but mighty structure plays a vital role in our lives, as it manages not only our heart rate and breathing but also other autonomic processes.
The medulla oblongata's role in controlling heart rate and breathing is significant. It works in conjunction with the vagus nerve, the tenth cranial nerve, which is responsible for transmitting signals to manage heart rate, intestinal movements, and more. The vagus nerve connects to all the major organs from the neck to the top part of the colon, playing a crucial role in maintaining homeostasis.
Additionally, the medulla oblongata's impact on heart rate and breathing is also tied to its function in aggression. While emotions like anger and aggression primarily rely on the limbic system, the medulla oblongata does have a role in managing aggression by controlling heart rate and breathing.
In summary, the brainstem, through the medulla oblongata, plays a vital role in regulating unconscious functions like heart rate and breathing. Its role in controlling these processes is integral to our survival, and disruptions to this area of the brain can have significant consequences, as evidenced by conditions like Wallenberg syndrome and Dejerine syndrome, which result from strokes affecting the medulla.
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Cerebrum coordinates movement and regulates temperature
The brain is an incredibly complex organ that controls thought, memory, emotion, touch, motor skills, vision, respiration, and every process that regulates the body, including temperature. The cerebrum is the largest part of the brain and is composed of two hemispheres, each of which has four lobes: the frontal, parietal, temporal, and occipital lobes.
The cerebrum plays a crucial role in coordinating movement. The frontal lobe, located at the front of the head, is involved in movement, decision-making, and personality characteristics. It also plays a role in the recognition of smell and speech ability. The parietal lobe, on the other hand, helps with interpreting pain and touch, understanding spatial relationships, and recognising objects. The cerebellum, which is connected to the cerebrum, also plays a crucial role in coordinating voluntary muscle movements and maintaining balance. Damage to the cerebellum can result in muscle incoordination and difficulties with posture and gait.
In addition to the cerebrum and cerebellum, other parts of the brain are involved in movement. The midbrain, for example, is a complex structure that enables movement and coordination. It contains the substantia nigra, an area affected by Parkinson's disease that is rich in dopamine neurons. The basal ganglia, which is part of the midbrain, also play a role in enabling movement and coordination. The brainstem, which includes the midbrain, pons, and medulla, facilitates various functions related to movement, including hearing, tear production, chewing, blinking, and balance.
While the brain as a whole regulates temperature, the hypothalamus, a small structure located above the pituitary gland, plays a crucial role in this process. It sends chemical messages to the pituitary gland to control its function and helps regulate body temperature, synchronise sleep patterns, control hunger and thirst, and manage some aspects of memory and emotion. The brainstem, which connects the cerebrum to the spinal cord, also plays a role in temperature regulation by facilitating responses to environmental changes.
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Frontal lobe is involved in personality, decision-making and movement
The frontal lobe is the front-most part of the brain, responsible for controlling many abilities we use in our everyday lives. It is involved in decision-making, movement, and personality, as well as emotions, judgment, self-control, memory, and social skills.
Decision-making
Neuropsychological studies suggest that decision-making occurs in the prefrontal cortex (PFC), which is part of the frontal lobe. Patients with damage to the PFC often show an inability to make choices that meet their needs and goals. They may vacillate when making decisions, make risky investments, and exhibit socially inappropriate behaviour.
Movement
The frontal lobe controls voluntary muscle movements, such as moving your hand to pick something up or using your legs to stand up and walk. It also contains the brain area that controls the muscles used for speaking. Damage to the frontal lobe can cause trouble with moving certain muscles, including those used for talking.
Personality
The frontal lobe is also home to areas that control personality, and damage to this area of the brain can cause personality changes. For example, patients with damage to the frontal lobe often live disorganized lives, tend to be impatient, and exhibit socially inappropriate behaviour.
The frontal lobe is a key area of study for brain-related and mental health-related fields of medicine. Conditions that affect the frontal lobe include Alzheimer's disease, attention-deficit hyperactivity disorder (ADHD), autism spectrum disorder, brain tumours, concussions, and more.
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Occipital lobe is involved with vision
The occipital lobe, located at the back of the brain, is the part of the brain responsible for interpreting information from the eyes and turning it into what a person sees. It helps determine distance, depth, colour, and other aspects of vision. The occipital lobe has four different sections, each responsible for different visual functions. The two primary visual cortices, located within the occipital lobe, are the primary visual cortex (Brodmann area 17 or V1) and the secondary visual cortex (Brodmann areas 18, 19, or V2, V3, V4, V5).
The primary visual cortex receives information from the retina and interprets and transmits information related to space, location, motion, and colour of objects in the visual field. This information is sent through two pathways: the ventral stream and the dorsal stream. The ventral stream carries information to the temporal lobe, which helps the brain give meaning to objects in the field of vision and aids in object recognition and conscious awareness. The dorsal stream shares information about an object's location with the parietal lobe, which takes in other information about the space and shape of objects in the field of vision.
The secondary visual cortex deals with similar types of visual information as the primary visual cortex. It receives information from the primary visual cortex and processes it further. The occipital lobe also links sight with other senses and brain abilities, such as hearing or touch. For example, in cases of blindness, the occipital lobe can allow a person to "see" an object by feeling it or form a mental image of their surroundings based on what they hear.
Disorders or damage to the occipital lobe can lead to various vision-related issues, such as partial or total vision loss, visual agnosias, visual hallucinations, and cortical blindness. Occipital lobe seizures can also occur, often triggered by external visual stimuli such as television, video games, or any flicker stimulatory system. These seizures are characterised by bright colours and severely blurred vision.
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Frequently asked questions
The brain is an organ that controls many functions, including thought, memory, emotion, touch, motor skills, vision, and respiration. The brain uses electrical and chemical signals to carry out these functions. While the brain as a whole controls electricity, specific parts of the brain are responsible for different functions.
The DLPFC, or the left dorsolateral prefrontal cortex, is important for attention and impulses. It is less active in people with ADHD, who have difficulty concentrating and controlling impulsive behaviour.
The parietal lobe is involved in interpreting pain and touch in the body. It also helps a person identify objects and understand spatial relationships.
The temporal lobes are involved in short-term memory, speech, musical rhythm, and some degree of smell recognition.
Neurons generate electric signals through the motion of ions across the cell membrane. These electrical impulses allow the brain to coordinate behaviour, sensation, thoughts, and emotions.
