Scientific journal
European Journal of Natural History
ISSN 2073-4972

Regularity of Brain Bioelectric Activity Reaction at Harmonic Sound Influence

Grigorieva E.A., Pevzner A.A., Diakonov A.L.
The unknown before common regularity of the human being brain reaction under the influence of harmonic sound signals of various frequencies has been found. The synchronization of bioelectrical brain activity occurs under the sound influence at the frequency equal to extreme maximum of the baseline EEG spectrum, and desynchronization of bioelectrical brain activity occurs under the sound influence at the frequency equal to the extreme minimum of the baseline EEG spectrum. Mentioned brain reactions occur in both multiple rise and multiple fall of sound frequency (if multiple ration is equal to 2n).

Human´s organism reacts to musical (harmonic) sounds differently. In the works [3] there is a description of method and program, titled as «Music of the Brain» suggested by Ya.I. Levin. The experience has been accumulated concerning insomnia, depression and inquietude treatment as well as increase of adaptation of healthy people to mental workload. However there is no information about the correlation of the particular biosignal spectrum frequencies and the harmonics frequencies activating the sounds.

R.A. Monroe´s works are about biosignal resonance at the expense of beat frequency with the appropriate rhythmical delta, theta, alpha, beta ranges. However there is no information about the particular biosignal patient determination for binaural rhythm frequencies selection in order to provide for the appropriate biosignal reaction.

Objectives: to research the reaction of human being bioelectrical brain activity to harmonic sound of different frequencies, which depends on spectral composition of background EEG.

Materials and methods of research

the research included 86 humans (42 men and 53 women) at the age of 18-50 without serious somatic and mental pathology. Baseline EEG was registered (16 channels in accordance with the international standard) and baseline EEG spectral analysis was carried out with the help of the «Brainlog» software. Consequently the EEG spectrograms as a histogram for every deflection with the step 0,5 Hz have been fixed. Studying the baseline EEG spectrums histograms, the extreme harmonic frequencies were defined. Extreme maximum exceeded adjacent harmonics in amplitude and extreme minimum fell behind the adjacent harmonics in amplitude.

Then there was a harmonic sound influence, the frequency of which changed within the scope of the beginning intended frequency according to the linear law. Sound frequency variation was in different randes as with the frequency up and down. Thus the value of given frequency was defined by the period of the sounding, according to the formula

fi = fн ± |fк - fн|ti/t (1)

where fн - beginning frequency; fк -ending frequency; t - period of the sounding from fн to fк - frequency per a moment ti

Simultaneously with the sound influence, the recording of bioelectric brain activity was made.

Analyzing the EEG the points in time of local synchronization and desynchronization of the biopotentials were recorded. For all the points in time of local synchronization and desynchronization according to (1) corresponding sound frequencies were defined.

Results of research and their discussion

Results of the research have shown that he synchronization of the bioelectric brain activity occurs under the sound influence with the frequency equal to the extreme maximum frequency of the baseline EEG and the desynchronization occurs under the sound influence with frequency equal to the extreme minimum of the baseline EEG.

The unknown before regular occurrence has been determined, it presupposes the regularity if the human being brain reaction at the harmonic sound influence and the matter is that during the harmonic sound signal influence with the frequency multiple of the extreme maximum frequency of that human being bioelectric signal spectral content obtained before the influence, and the synchronization of the bioelectrical brain activity occurs, and the multiplicity factor corresponds to the following formula k = 2n.

Thus the frequency of harmonic sound influence, which stipulates the synchronization of bioelectrical activity, is calculated according to the formula:

Fs.s = fe max k. (2)

When the harmonic sound signal influences the organism at the frequency multiple of extreme minimum of bioelectrical signal spectral composition of the human being, which is obtained before the influence, the desynchronization of bioelectrical brain activity occurs. And thereafter the frequency of harmonic sound influence, which stipulates the desynchronization of bioelectrical activity, is calculated acoording to the formula [13, 14, 15]:

Fso.d = fе min k. (3)

In the work, local synchronization and desynchronization reaction could be both short-term (fractions of second) and long-term (up to several seconds). It corresponds with the Ye.D. Homskaya research [19]. Besides, it is more appropriate to judge about the synchronization and desynchronization (activation and deactivation) not only by its duration as by direction of bioelectrical activity variation in comparison with the initial level [1, 17]. Thus, desynchronization was understood as the replacement of slower, time-ordered wave activity by the faster, less periodic oscillations, significant amplitude drop; synchronization is an opposite phenomenon.

In the dynamic systems of brain structures that provide mental function, every phase is marked with a key section, by impacting on which the integral function can be changed, what is considered to be «rigid link» of bioelectrical brain activity [1, 2]. Found regularity of the human reaction at harmonic sound influence provides the creation of the mechanism, which can rearrange bioelectrical brain activity for overcoming pathologically stable state.

Found regularity is characteristic for all 86 healthy humans, for all 16 deflections, but its higher expression is in the occipitle and upper temporal areas.

The table of results of one patient is given as an example. The values of sound frequencies, calculated according to the formula (2) for maximum and according to the formu-
la (3) - or minimum extreme frequencies of EEG spectrum and corresponding to them sound frequencies, causing synchronization and desynchronization of bioelectrical brain activity. The table shows an evidence of the fact that the deflections of sound frequencies causing the synchronization and desynchronization of bioelectrical brain activity from the frequencies, calculated according to the extreme frequencies of the EEG spectrum, do not exceed 1 %.

George (occipute) 12.01.09

Number seriatim

О1 max

О1 min

О2 max

О2 min

1

2

3

4

5

6

7

8

9

10

11

12

fе max·2n

fso.s

mistake

fе min·2n

fso.d

mistake

fe max·2n

fso.s

mistake

fe min·2n

fso.d

mistake

Hz

Hz

 %

Hz

Hz

 %

Hz

Hz

 %

Hz

Hz

 %

1

896

896

0,0

912

915

0,4

896

902

0,7

880

880

0,0

2

960

960

0,0

928

937

1,0

944

944

0,0

912

915

0,4

3

1024

1034

1,0

960

968

0,8

1024

1034

1,0

960

968

0,8

4

1184

1184

0,0

976

986

1,0

1056

1056

0,0

992

992

0,0

5

1280

1280

0,0

1024

1024

0,0

1280

1280

0,0

1024

1024

0,0

6

1472

1465

0,5

1152

1162

0,8

1472

1461

0,8

1152

1152

0,0

7

1536

1544

0,5

1216

1216

0,0

1536

1536

0,0

1216

1216

0,0

8

1568

1562

0,4

1408

1408

0,0

1632

1632

0,0

1248

1248

0,0

9

1600

1600

0,0

1536

1536

0,0

1696

1696

0,0

1408

1408

0,0

10

1792

1792

0,0

1664

1664

0,0

1792

1792

0,0

1600

1593

0,5

11

1888

1888

0,0

1824

1824

0,0

1888

1888

0,0

1664

1664

0,0

12

1920

1923

0,1

1856

1856

0,0

2048

2042

0,3

1760

1764

0,3

13

2048

2048

0,0

1920

1910

0,5

2112

2116

0,2

1824

1835

0,6

14

2368

2368

0,0

1952

1958

0,3

2560

2560

0,0

1920

1910

0,5

15

2560

2560

0,0

2048

2048

0,0

2944

2944

0,0

1984

1980

0,2

16

2944

2944

0,0

2304

2310

0,3

3072

3072

0,0

2048

2048

0,0

17

3072

3072

0,0

2432

2438

0,2

3264

3264

0,0

2304

2301

0,1

18

3136

3159

0,7

2816

2816

0,0

3392

3397

0,1

2432

2442

0,4

19

3200

3200

0,0

3072

3076

0,1

 

 

 

2496

2504

0,3

20

 

 

 

3328

3322

0,2

 

 

 

2816

2816

0,0

21

 

 

 

 

 

 

 

 

 

3200

3194

0,2

22

 

 

 

 

 

 

 

 

 

3328

3328

0,0

Conclusions

  1. Unknown before common reaction regularity of human brain under the influence of harmonic sound signals of different frequencies has been found. The frequencies values of harmonic sound influence, under which the synchronization and desynchronization of brain biopotentials occurs, have been determined by the initial EEG (before the sound influence) of every person as consistent with the extreme frequencies of spectral EEG content.
  2. Synchronization of the bioelectrical brain activity occurs under the sound influence at the frequency equal to the extreme maximum of the baseline EEG spectrum, and desynchronization of bioelectrical brain activity occurs under the sound influence at the frequency equal to the extreme minimum of the baseline EEG spectrum.
  3. Under the sound influence at the frequency exceeding maximal frequency of the EEG spectrum, synchronization of the bioelectrical brain activity occurs at multiple exceeding by the sound frequency of the extreme maximum frequency of the baseline EEG spectrum, and desynchronization occurs at multiple exceeding by the sound frequency of the extreme minimum frequency.
  4. It has been determined that the exceeding multiplication factor by the sound frequency of the relevant extreme baseline EEG spectrum is equal to 2n.

References

  1. Bekhtereva N.P. Neurophysiologic Aspects of Human Being Mental Activity. - L. Meditsina, 1971. - 120 p.
  2. Bekhtereva N.P. Brain Magic and Life Labyrinths. - SPb., 1999.
  3. Levin Y.I. Method of Influence on Body. RU Patent No. 2096990, Class А 61 В 5/04, Bul. No.33 of 27.11.97.
  4. Pevzner А.А., Grigorieva Е.А. Method of Influence on Body. Pat. RF No.2143939 B.I. No.1 of 10.01.2000.
  5. Pevzner А.А., Grigorieva Е.А., Diakonov А.L., Pevzner L.А. Method of Influence on Body. RF Patent of Invention No.22965994, А 61 N 7/00, А 61 М 21/00, А 61 B 5/04. 16.06.2005, Bul.No.19 of 10.04.2007.
  6. Pat. USA, N 5213562, Robert A. Monroe. Hemi-Sync. Method of Inducting Mental, Emotional and Physical States of Consciousness, Including Specific Mental Activity, in the Human Being. - 1993.
  7. Pat. USA, N 5356368, Robert A. Monroe. Hemi-Sync. Method of Inducting Desired States of Consciousness. - 1994.