[wineeg] theta question

  • From: "Vernon, David" <d.vernon@xxxxxxxxxxxxxx>
  • To: "'wineeg@xxxxxxxxxxxxx'" <wineeg@xxxxxxxxxxxxx>
  • Date: Wed, 23 Jul 2003 10:44:42 +0100


can anybody help clarify an issue for me. 

I have examined the eeg of a number of children with ADHD and quite a few
show a high (ie greater than 4) theta/beta ratio at CZ. This is when theta
is defined as 4-8hz and beta as 13-21hz, as per Monastra's procedure etc.

However, when i look at the theta at CZ what i 'think' i'm seeing is really
slow alpha. That is, its peaking around 7.2-7.5Hz, it attenuates when eyes
are open relative to closed, and there is only the one peak. Its not like
this is a theta peak and there is also an alpha peak. My concern is that
strictly speaking, if one were to adhere to the numbers, this patient
exhibits an extremely high theta/beta ratio and as such could benefit from
neurofeedback aimed at reducing theta and enhancing beta. However, i think
that what is really the case is that the patient shows a slightly slow alpha
peak, which could be a result of the age of the child, and may just speed up
with age. In addition, if one takes Klimesch's view and identifies the
'individual alpha frequency' +/- 2hz this peak would without doubt be within
the individual alpha range. As such the only neurofeedback that would seem
appropriate would be to focus on speeding up alpha.

I suppose my question is really this: A wide range of literature suggests
that some children with ADHD may exhibit an excess of theta and a deficit of
beta making neurofeedback a therapeutic option, however is this true Theta
or is it slow alpha? Either way what would you recommend? 

As usual any comments etc would be gratefully received


David J Vernon PhD
Dept. of Cognitive Neuroscience & Behaviour
Imperial College London
St Dunstan's Road
W6 8RP

Tel:    44 (0) 208 383 0584
Fax:   44 (0) 208 846 1670

-----Original Message-----
From: Joe Siri Ekgren [mailto:vennskap@xxxxxxxxx]
Sent: 09 April 2003 19:16
To: wineeg@xxxxxxxxxxxxx
Subject: [wineeg] Latest version of WinEEG, solves time clock error

Dear Listmembers,

With the latest version of WinEEG, the software now records in real 
time on laptops with Win98. (Previous versions ran at half speed, 
i.e. a recording length of 60 WinEEG one second epochs took 160 
seconds in real time under Win98). The screen gets more jumpy on my 
500 Mhz laptop, and harder to read, so there is a price for 

I can=B4t find an updated version number, but the new version is 
exactly 1 699 480 bytes.

Valery says that the improvements are:
>1.  It works faster under Windows XP during EEG recording.
>2. It is possible to use graphics acceleration (See "Equipment parameters"
>menu Setup). To use graphics acceleration you need to install DirectX 7 or
>3. It is possible to change parameters of COM port that is used for
>synchronization of PSYTASK. (See "Equipment parameters" menu Setup).This
>possibility can help in some cases when COM ports of computers work bad.

There is no download site, but I will be happy to forward this WinEEG 
version to anyone interested.
Joe Siri Ekgren  MD                                  
Observatorie Terrasse 6 B,
N-0270 Oslo, Norway
+ 47   9229 4171 (mobile)
+ 47   22 44 09 18 (home)

Other related posts: