Application for evaluation machine
EEG measurement method and features
Since 1875,various approaches have been devised toobservebrain activity.
EEG Measurement
Electroencephalogram measurement device
Currently, thefollowing five types of electroencephalogram measurement devices are mainly used.
・Functional magnetic resonance imaging (fMRI)
・Near-infrared spectroscopy (NIRS)
・Invasive type (operated by embedding electrodes in the body)
・Magnetoencephalography (MEG)
・Electroencephalograph (EEG)
EEG measurement method
The measurement method for each deviceis as follows.
|
name |
Measuring method |
|
fMRI_ |
A method to observe changes in brain blood volume with MRI |
|
NIRS |
A method to observe changes in cerebral blood volume using a light source and a light-receiving sensor |
|
invasive |
Implant terminals in the bodymethod of directly capturing electrical signals |
|
MEG |
A method of capturing electrical signals in the brain as magnetism using a superconducting quantum interference device (SQUID), a type of magnetic sensor. |
|
EEG |
A method of directly measuringelectrical activity generated in the brain fromelectrodes placed on the scalp. |
feature
What kind of difference is caused by the difference in the measurement method?Its features are as follows.
|
name |
Spatial resolution |
time resolution |
Ease of operation |
|
fMRI_ |
high |
low |
Limited to fixed installation implementation |
|
NIRS |
low |
low |
Limited to fixed installation implementation |
|
invasive |
high |
high |
Easy once set up |
|
MEG |
Moderate |
high |
There are restrictions on the measurement environment |
|
EEG |
low |
high |
highest degree of freedom |
*Spatial resolution = Clarifying the localization of the brain *Spatial resolution = Capturing minutely minute changes in brain activity
invasiveis the best, but due to ethical issues it is currentlymedical practice, etc.Restricted to limited use.
Other methods have advantages and disadvantages,Roughly speaking, whether the measurement environment has a degree of freedom, whether the spatial resolution is high or low, and whether the temporal resolution is high or low, select according to the phenomenon you want to observe.
What is EEG
The application of electroencephalograms has traditionally been limited to the medical field, but it is spreading to the business and consumer fields due to the boom in meditation, etc., and along with that, EEG, which can be used wirelessly and has a high degree of operational freedom, is becoming popular. Attention is growing.
It is no exaggeration to say that the key to utilizing EEG is what kind of EEG to choose.
Correctly understanding which part of the brain produces the target phenomenon and selecting the most suitable EEG is a shortcut to commercialization.
EEG type
In this article, we will also introduce the types of EEG.
EEGcan be broadlyclassified into two types:dry type and wet type.
|
|
Preparation time |
Required number of people |
system size |
Subject load |
Experiment time |
sensitivity |
|
Wet type |
1 hour |
support member |
Separate logger required |
high |
Depending on gel performance |
high |
|
drytype |
5 minutes |
subject only |
Built-in |
low |
long |
Moderate |
The sensitivity of the dry type was inferior to that of the wet type, but with the development of high-sensitivity sensors, more and more manufacturers are claiming that they now have the same level of sensitivity.
Another feature of the dry type is the degree of freedom in shape.
・Headphone type that covers all areas
- Over-the-ear type that covers the temporal lobe
・Bant type that covers the frontal lobe
Various shapes have been devised according to the application.
free demonstration
Guidance of the demonstration
Would you like to actually measure brain waves?
What is the "skill transfer of experts" based on brain waves? What is AI that learns human consciousness and judgment?
I think there are a lot of unknown things, so why not try measuring your brain waves first and experience what it's like?
After the actual measurement, we will provide support from proposals to implementation and operation so that we can use AI using EEG at the customer's site while including examples of AI utilization in our activities so far. increase.
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