EEG or Brain waves Sensor during Sleep
Electroencephalography (EEG) is an electrophysiological monitoring method to record the
electrical activity of the brain. Brain sensors are typically noninvasive, with the electrodes
placed alongside the scalp, though invasive electrodes are sometimes used in
EEG measures voltage fluctuations that arise from the ionic current within the neurons of the
brain. EEG is most often used to diagnose epilepsy, which can be identified from the
abnormalities in EEG readings. Some other problems which can be diagnosed via EEG sensors are
sleep disorders, depth of anesthesia, encephalopathies, and brain death. Earlier, EEG was widely
used for the first-hand diagnosis of tumors, stroke, and other focal brain disorders. But still,
EEG is a valuable tool for research and diagnosis. It offers millisecond-range temporal
resolution which is certainly not possible in other methods like in CT, PET, or MRI.
So, it can be concluded that the frequency of brain waves is directly proportional to the
attention span of the brain. For example, the lowest frequency Delta state occurs when we are in
a state of deep sleep while the highest frequency Gamma state occurs when we are in a state of
being highly cautious.
A brain wave sensor is a remarkable tool to keep a note of the brain waves. With the whole world
proceeding towards a digital era, such high technology devices should be used in an affirmative
Types of brain waves
The brain waves consist of a spectrum of frequencies which are mainly between 1Hz-100Hz. This
spectrum is majorly divided into five different types of waves, which are as follows:
- Alpha waves: These waves are associated with the highest attention levels of the
mind. When our brain is indulged in activities that require active participation, beta
waves are generated. These waves signify alertness, logic, and waking consciousness of
the mind. These waves have low amplitudes but high frequencies. Their frequency ranges
from 15 to 40 cycles a second. Further, these beta waves are divided into three bands:
- Beta waves: These waves were discovered by German neurologist Hans Berger. Alpha
originate from the occipital lobe of the brain. Alpha stands in between beta and theta
and thus holds the gap between conscious and subconscious mind. This wave is often
recognized by a pleasant feeling and is co-related with relaxed wakefulness as well as
unique thoughts. During some meditative states, alpha waves are likely to be dominant as
they aid overall mental coordination, calmness, and mind/body integration. When we are
stressed, a phenomenon named ‘alpha blocking’ has a probability of occurring which
involves little alpha but excessive beta activity. These beta waves block out the
production of alpha waves. The frequency range of alpha waves is between 8 to 12 Hz.
- Low beta: These are of the frequency 12-15Hz and are characterized as fast or
- Beta: These are of the frequency 15-22 Hz and are firmly defined as high
- Hi beta: These are of the frequency 22-38 Hz and are characterized as anxiety or
- Gamma waves: These waves are associated with the processing of visual, auditory
stimuli, and with our ability to learn. People who are mentally challenged have low
gamma activities. These waves are always supported by other waves such as alpha, theta,
and delta. These waves have a frequency range of 38-42 Hz and thus are the fastest of
all the brainwaves, which makes them pass information at a rapid pace.
- Theta waves: Scientists believe that all the spiritual connections of our brain
are experienced due to theta waves. That is to say, theta waves are responsible for
memories and visions. Theta waves are not an external factor but instead the inner sense
of the body. These waves have their involvement in restorative sleep and short-term
memory as well. Their frequency lies between 3 to 8 Hz.
- Delta waves: Delta waves activity in infants is higher than in adults. Studies
have proven that delta waves are the most dominating brain wave in children till five
years of their birth. There’s a decline in the drop rate of delta wave by 25% from 11-14
years of age, which further continues declining the whole life span, and is almost
absent at a rough age of 75. Interruption in delta waves can be caused by a change in
nutrient metabolism, physiological damage, and chemical alteration. If there is a proper
amount of delta waves present, there is quite less anxiety, improved sleep, and relief
As there are various types of brain waves, there is a chance of their instability to occur.
To learn about the instability of brain waves, let’s read the next few lines.
Instability of brain waves Sensor | Train Brain
Brain wave patterns tell a lot about a person, and any imbalance in them can affect the
emotional as well as neuro physical health of a person. Various conditions caused due to
instability of brain waves are OCD, panic attacks, migraines, and many more. The two
conditions of instability of brainwaves include:
- So, we know what are brain waves, their types, and their instability. But, how do we
know how to sense them or calculate their frequency? Well, there is a device for that,
called a brain wave sensor.
- Under arousal: This condition leads to problems like insomnia, depression, lack of
attention span, and chronic pain.
So, we know what are brain waves, their types, and their instability. But, how do we know how
to sense them or calculate their frequency? Well, there is a device for that, called a
brain wave sensor.