Wiktor Wise
The human brain is a complex organ, and its functionality has long been a subject of scientific interest. One of the key aspects of brain function is its use of electricity. While it may conjure images of lightning bolts zapping through our veins, the electricity in our brains is a natural and constant occurrence. This electricity is produced by our brain cells or neurons, which use electrical signals to communicate with each other. This process underpins every thought, action, sensation, and emotion we experience. The discovery of this intrinsic electricity has led to further exploration, including the use of external electrical stimulation to potentially enhance cognitive functions and treat brain injuries.
| Characteristics | Values |
|---|---|
| Electricity in the brain | The brain produces a small amount of electricity |
| How is it produced | Through electrical signals exchanged by about 86 billion neurons |
| Use | Every thought, move, heartbeat, memory, etc. happens due to electricity |
| Measurement | Electrodes placed on the outside of the head with a gel for better connection |
| Electrodes are placed on a cap that is worn on the head | |
| Electrodes can also be placed on the cheek to detect eye movement | |
| The constant activity of the brain measured by the electrodes is called the electroencephalogram or EEG | |
| Application | Stimulating the brain with electricity can improve short-term working memory |
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What You'll Learn
Brain stimulation with electromagnetic waves
The brain can be stimulated with electromagnetic waves, a process known as repetitive Transcranial Magnetic Stimulation (rTMS). This is a non-invasive therapy that uses an electromagnet to stimulate the brain with repeated low-intensity pulses. The electromagnetic coil is held against the head near an area of the brain thought to be involved in mood regulation, cognitive control, or both. The left prefrontal cortex, for instance, is targeted for patients with depression, while the dorsomedial prefrontal cortex or anterior cingulate cortex is targeted for patients with OCD.
RTMS is distinct from Electroconvulsive Therapy (ECT) in that it does not require electricity to be applied directly to the head. Instead, magnetic stimulation is targeted at a specific brain site. The procedure does not require anaesthesia and can be performed in a clinical or office setting. A typical rTMS session can last anywhere from 3 to 40 minutes, with a course of treatment consisting of daily sessions for 4 to 6 weeks.
Deep TMS involves the use of two coils to deliver more stimulation and target larger structures deep in the brain. The patient will usually feel a slight knocking or tapping on their head as the pulses are administered. While the pulses pass easily through the skull, there is no consensus on the best way to position the coil or deliver the pulses.
Research into rTMS is still ongoing, with the aim of establishing the safest and most effective uses, optimal brain sites to target, and best follow-up approaches to sustain clinical improvement.
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Measuring brain activity with EEG caps
The human brain is a powerhouse of electrical activity, with brain cells constantly communicating via electrical impulses. To study this electrical activity, scientists employ Electroencephalography, or EEG, which involves the use of electrodes placed on the scalp to capture and record voltage fluctuations.
EEG caps are a type of headgear equipped with multiple electrodes, designed to measure brain activity. These caps are an essential tool in neuroscience research and clinical applications. The electrodes on an EEG cap are flat, metal discs that are attached to the scalp to detect electrical charges. The number of electrodes can vary, with a minimum of 8 electrodes required to measure a specific part of the brain. More advanced imaging studies may use EEG caps with 20 or more electrodes, with some systems offering up to 32 electrodes. The placement of these electrodes is crucial, as different areas of the skull produce different signals.
EEG caps provide precise electrode placement, ensuring that the electrodes are correctly positioned on the scalp. This precision is vital as the recordings made by the electrodes depend on their orientation and distance from the source of the electrical activity. The EEG caps also offer comfort to the wearer, which is important when conducting studies that may require participants to wear the caps for extended periods.
In addition to the electrodes, EEG caps may also be used in conjunction with other software and biosensors to enhance the data collected. For example, eye-tracking software can be used to understand where a person is looking when demonstrating a particular brain response, providing valuable insights into their reaction to stimuli. Other biosensors that can be integrated include ECG (heart activity), EMG (muscle activity), and respiration monitoring, allowing for a more comprehensive understanding of an individual's physiological state during EEG measurements.
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The role of neurons in transmitting electrical signals
The human brain is an incredibly complex organ, and its ability to transmit electrical signals is a key component of its functionality. At the core of this process are neurons, or nerve cells, which play a critical role in transmitting electrical impulses throughout the body.
Neurons are the primary components of the nervous system, and they are responsible for conveying information both electrically and chemically. They achieve this through the movement of electrical charges, or impulses, along their length. These impulses carry information from one place to another within the nervous system.
A neuron has three main structural components: dendrites, the cell body, and the axon. Dendrites are thin, branched tendrils that extend from the cell, acting as receivers of information from other neurons. The cell body, or soma, performs the basic cellular functions necessary for the neuron's survival. At the end of the neuron is the axon, a long, thin fiber that transmits nerve impulses to other neurons.
The transmission of electrical signals occurs through the generation of electrical charges within the neuron. This is achieved by the movement of ions, such as sodium, potassium, chloride, and calcium, across the neuron's plasma membrane. The uneven distribution of these electrically charged particles creates a membrane potential, which results in a voltage difference across the membrane. When this voltage difference is altered, it leads to depolarization, and if it exceeds a certain threshold, an impulse, or action potential, is generated.
Action potentials are the fundamental signals that carry information in the nervous system. They propagate along the length of the axon and ensure that the signal moves in only one direction, toward the axon tip. At the axon tip, the electrical signal is converted into a chemical signal through the release of neurotransmitters into the synaptic cleft. These neurotransmitters, such as dopamine, can then bind to receptors on the next neuron, continuing the transmission of information throughout the nervous system.
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Improving memory and cognitive tasks with electricity
The brain uses electricity to operate and form thoughts. Scientists have discovered that by using electrical currents to stimulate the brain, memory and cognitive tasks can be improved. This process is known as electrostimulation or electrical brain stimulation.
Electrical brain stimulation involves applying weak electrical currents to the brain to synchronise brain waves and improve the performance of working memory. Working memory is the brain's ability to retain small bits of information that can be easily accessed when performing certain tasks. For example, remembering a grocery list or telephone numbers.
Research has shown that when the brain is stimulated in a synchronous way, participants' reaction times on memory tasks improve, especially on more complex tasks. In one study, participants were asked to remember two sets of numbers and match them with a current number. The participants' performance improved when the brain regions were stimulated in sync.
Electrical brain stimulation has also been found to improve working memory in older adults. In a study conducted by Boston University, older adults received 25 minutes of mild electrical stimulation through scalp electrodes. After the stimulation, the older adults performed memory tasks as accurately as younger adults.
The potential applications of electrical brain stimulation are far-reaching. It could be used to treat patients with traumatic brain injuries, strokes, epilepsy, or cognitive impairments such as Alzheimer's disease. However, one challenge to making this treatment widely available is the individual nature of people's brains. The electrodes must be targeted to the right part of the brain and have the correct frequency.
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The history of discovering electricity in the brain
The brain is an incredibly fascinating organ, and its relationship with electricity has been a topic of interest for centuries. The history of discovering electricity in the brain is a long and winding one, with many pioneers contributing to our understanding of this complex organ.
One of the earliest known explorations of the brain's electrical properties was conducted by Richard Caton, an English scientist who lived from 1842 to 1926. Caton recorded electrical activity from the brains of animals, noting fluctuations during sleep and the absence of activity after death. He made these discoveries using a sensitive galvanometer and reported them in 1875, noting that a potential change was observed when an animal turned its head or chewed food. Caton's work laid the foundation for further exploration into the electrical nature of the brain.
Following Caton's discoveries, a Polish physiologist named Beck made significant contributions. About 15 years after Caton's initial findings, Beck reported observing waxing and waning potential changes in the cortex of animals. He also noted that these rhythmic potentials disappeared when the animal's eyes were exposed to light, describing what appeared to be the first arousal reaction.
In the late 19th and early 20th centuries, the field of neuroscience and our understanding of the brain's electricity advanced further. Hans Berger, a German psychiatrist (1873-1941), recorded the first human electroencephalography (EEG) in 1924, marking a pivotal moment in the history of brain electricity research. Electroencephalography became a crucial tool for studying the electrical activity of the brain, with the first clinical EEG laboratories established in the United States in the 1930s and 1940s.
The mid-20th century saw continued progress in understanding the electrical activity of the brain, with numerous researchers making significant contributions. Notable names include Robert W. Baloh, a leader in the field of neurotology, who has extensively studied the history of neurology and authored numerous books and articles on the subject. Baloh's work has provided a historical context for understanding modern concepts of electricity and neuroscience, inspiring both newcomers and experienced researchers.
In recent years, scientists have made remarkable strides in using electricity to enhance brain function. Researchers at Imperial College London have found that stimulating the brain with electricity can improve short-term working memory by synchronizing brain waves. This discovery holds potential for treating patients with traumatic brain injuries, strokes, or epilepsy, offering hope for restoring lost skills through cognitive training.
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Frequently asked questions
Yes, the brain produces a small amount of electricity. This electricity is produced by the 86 billion neurons in our brains, which exchange signals with hundreds or thousands of others.
The cells in our bodies use electrical signals to send messages to each other. This electricity can be measured using electrodes that sit on the outside of the head and detect the activity inside.
This electricity enables us to have thoughts, make movements, see, hear, smell, and feel emotions.
Yes, scientists have discovered that stimulating the brain with electricity can improve short-term working memory by synchronizing brain waves.
Researchers hope that by applying a low voltage current, they can bring different areas of the brain in sync and bypass damaged areas. This could potentially be used to treat patients with traumatic brain injuries, strokes, or epilepsy.
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