Analysis individual EEG alpha activity peculiarities for enhancement Neurofeedback efficiency

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COST B27 ENOC Joint WGs Meeting
Swansea UK, 16-18 September 2006
Bazanova Olga M. Aftanas Lubomir I.
Analysis individual EEG alpha activity
peculiarities for enhancement Neurofeedback
efficiency
State-Research Inst. Molecular Biology
Biophysics, State-Research Inst.
Physiology,Siberian Branch, Russian Academy of
Medical Sciences
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Neurofeedback efficiency runs up to no more than
75 (Monastra et al., 2005)

• Possible reasons for NFT inefficiency
• the objective assessment of the neural
  organization in a given patient was not used
• the neurotherapy protocols were not individualized

(Thatcher et al, 1983 Kaiser, 2001 Monastra et
al 2005 John ER Prichep, 2006 )
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4-8 Hz may be theta for some and alpha for
others. (Kaiser D.,2001)
Reduce 4-8 Hz
extension 14-18 Hz
T a ?
a-2?
a-1?
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only the alpha atom had a significant temporal
correlation with the fMRI signal
Martinez-Montes Eduardo, Valdes-Sosa Pedro A,
Miwakeichi, Fumikazu, Goldman Robin I., and Cohen
Mark S. (2004). Concurrent EEG/fMRI analysis by
multiway Partial Least Squares. NeuroImage, 22,
10231034
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Alpha rhythm

• The oscillations in electric potential within the
  8- to 12-Hz range, normally recorded as
  sinusoidal waves with larger amplitudes over
  posterior regions during eyes-closed rest.
• The rhythm that diminishes when eyes are opened
  or during mental activity.

(Berger, 1929 Cooper et al., 1965 Pfurtscheller
et al., 1996 Nunez et al., 2001).
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IAPF individual alpha peak frequency -
predictor of cognitive capacities
(Jausovec (1996) Basar et al., 1997a
Giannitrapini (1969) Klimesch et al. (e.g. 1996,
1999) Klimesh and Doppelmayr (1998),
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IAPF depends on age
Clarck, 2001
(Mankovskiy and Belonog,1971 Roubicek, 1977
Epstein 1980 Li et al., 1996 Osaka et al.,
1999),
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IAPF depends on menstrual cycle stage
Individual Alpha peak frequency
( Creiutzfield et al.,1980,1982,1988 Bazanova et
al.,2004)
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What is alpha frequency range?
Kaplan, 2001,2003 Ray Cole, 1985.
Jensen et al 2002 Kilner, 2005 Martinez et
al2004 de Toffel Autret, 1991
P.Etevenon et al, 1990 Moretti et al 2004
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Alpha- a, theta- T, beta- ß
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Alpha rhythm

1. The oscillations in electric potential within the
   8- to 12-Hz range, normally recorded as
   sinusoidal waves with larger amplitudes over
   posterior regions during eyes-closed rest.
2. The rhythm that diminishes when eyes are opened
   or during mental activity.

(Berger, 1929 Cooper et al., 1965 Pfurtscheller
et al., 1996 Nunez et al., 2001).
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Alpha-1 may be theta for some and alpha for
others.
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Alpha-2 may be beta for some and alpha for
others.
8-12 Hz
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Alpha- a, theta- T, beta- ß
T
a
a
ß
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INDIVIDUAL ALPHA BAND WIDTH
rhythm that diminishes when eyes are opened or
during mental activity Berger Effect.
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IAAS - Individual amount of alpha suppression
(Koukkou 1980, 1982 Koukkou et al. 1982, 1991
Koukkou and Lehmann 1987 Schmelkina,1998 Kolev
et al. 2002)
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IAAS - Individual amount of alpha suppression
(Smelkina R1998 Larkina and Kirenskaya 2005).
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IAAS - Individual amount of alpha suppression
(Koukkou 1980, 1982 Koukkou et al. 1982, 1991
Koukkou and Lehmann 1987)
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Alpha peculiarities
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The main objective

• to demonstrate efficiency of Neurofeedback when
  individual EEG alpha activity parameters are in
  use

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Patients

• Methods.

patient C.- 7 year schoolboy ADHD
patient A. - 50 year professional musician
functional contracture
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Methods.

• Procedure

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Reducing T/ß - neurofeedback
Methods.
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Alpha-EEG/EMG-Biofeedback
Methods.
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• Methods.
• EEG recording

F3
?/ß
F4
C4
C3
Cz
P4
P3
a
O2
O1
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Methods. Alpha activity EEG analysis
eyes closed condition for IAPF
eyes open vs eyes closed condition for IABW and
IAAS
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Methods. Alpha activity EEG analysisindividual
alpha band width (IABW)
oe- open eyes
ce- closed eyes
Cut-off criteria 20
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Methods. Alpha activity EEG analysis.Individual
alpha band width (IABW)
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Methods. Alpha activity EEG analysisindividual
amount of alpha suppression (IAAS)
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Results. Baseline individual alpha activity
peculiarities
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Standard ranges Alpha-EEG/EMG Biofeedback
Results.
SNFB
Baseline condition
Post SNFB
EMG
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ResultsIndividual ranges Alpha-EEG/EMG
Biofeedback
.
INFB
EMG
Baseline condition
Post INFB
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Results.
Standard ranges ?/ß reducing Neurofeedback
SNFB
SNFB
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Results.
Individual ranges ?/ß reducing Neurofeedback
INFB
INFB
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Similarities

• The SNFB training had aggravated patients
  conditions along both electrophysiological
  (depression of alpha power, narrow IABW, weak
  IAAS, increased EMG), and behavioral domains.
• The INFB training had increased alpha activity
  indices and was associated with subjective
  feelings of relaxation, emotional calm and
  centeredness

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In the present research, due to the individual
frequency EEG analysis, the necessity of an
individualization of the approaches for
Neurofeedback technology is convincingly shown
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Thank you kindly