Delta oscillation in EEG

Official account have been launched one after another 3 Tweets , In turn, the theta、alpha and beta Oscillation is introduced , Only delta Oscillation has not been introduced yet . Of course , In addition to this 4 Out of common frequency bands , And high frequency gamma Oscillate , This will also be introduced later . This article is similar to the previous 3 Tweets are consistent , Just here for delta Oscillation to do a simple introduction and comb , I hope so delta New friends who are not familiar with oscillation have a basic understanding of it through this article . If you need further research , You can check the latest research literature .

Delta Oscillation and its classification

So-called delta Oscillate , According to the tradition EEG Band division , It generally means that the frequency is 1-4Hz Range of EEG components .Delta Low oscillation frequency 、 High range . For the moment , Identified delta There are two main origins , One is derived from the cortex , Its mechanism is not clear , It may be related to the cognitive function in the awake state ; The other is derived from thalamus , At present, there have been many studies on its mechanism , It is related to sleep [1].

Related to sleep delta Oscillate

      Delta Oscillation is associated with slow wave sleep , Sleep is thought to be associated with memory consolidation , therefore ,delta Oscillations also seem to be associated with memory consolidation during sleep . Related to sleep delta The oscillation mainly originated from thalamus , say concretely , From the thalamo-cortical The interaction and influence of different neuronal ionic currents in the loop .Delta Oscillation in non rapid eye movement period (NREM) At the end of （stage 3/4） Occupy the main component , Show high amplitude 、 Low frequency fluctuations , Pictured 1 Shown .

chart 1[2]

Relating to cognition delta Oscillate

        Besides being related to sleep ,delta Oscillations are also associated with higher cognitive functions , these delta The oscillations may originate mainly in the cortex . stay ERP under advisement , One of the most well-known ingredients is P3,P3 Reflect people's advanced cognitive function , Such as perception 、 Be careful 、 understand 、 Judgment, etc , and delta and theta Oscillation is P3 The main contributors to the composition [3,4]. chart 2 Is the author of the visual induced ERP The signal （ On the left ） Conduct time-frequency analysis （ Right picture ）, From the results of time-frequency analysis, it can be seen that ,delta The low frequency oscillation is right P3 Ingredients contribute the most . therefore , It can be said that delta Oscillation actually plays an important role in human attention , for instance , There are studies that show that , When subjects focus on internal tasks such as mental arithmetic ,delta The energy of oscillation will increase .

chart 2

reference

[1]Quantitative EEG, Event-Related Potentials and Neurotherapy

[2]Quantitative EEG Analysis Methods and Clinical Applications

[3]EEG delta oscillations as acorrelate of basic homeostatic and motivational processes

[4]Delta responses andcognitive processing: single-trial evaluations of human visual P300