I understand your concern, David. It's true that some ADHD children may have slow alpha which can be mixed with theta at Cz. However the effect of occipital or parietal alpha at Cz could be diminished by simply considering Eyes opened condition. Opening eyes dramatically suppresses this type of alpha. CMR rhythm is usually higher that 8 Hz and can not contaminate Cz reading. Juri VD> Hello, VD> can anybody help clarify an issue for me. VD> I have examined the eeg of a number of children with ADHD and quite a few VD> show a high (ie greater than 4) theta/beta ratio at CZ. This is when theta VD> is defined as 4-8hz and beta as 13-21hz, as per Monastra's procedure etc. VD> However, when i look at the theta at CZ what i 'think' i'm seeing is really VD> slow alpha. That is, its peaking around 7.2-7.5Hz, it attenuates when eyes VD> are open relative to closed, and there is only the one peak. Its not like VD> this is a theta peak and there is also an alpha peak. My concern is that VD> strictly speaking, if one were to adhere to the numbers, this patient VD> exhibits an extremely high theta/beta ratio and as such could benefit from VD> neurofeedback aimed at reducing theta and enhancing beta. However, i think VD> that what is really the case is that the patient shows a slightly slow alpha VD> peak, which could be a result of the age of the child, and may just speed up VD> with age. In addition, if one takes Klimesch's view and identifies the VD> 'individual alpha frequency' +/- 2hz this peak would without doubt be within VD> the individual alpha range. As such the only neurofeedback that would seem VD> appropriate would be to focus on speeding up alpha. VD> I suppose my question is really this: A wide range of literature suggests VD> that some children with ADHD may exhibit an excess of theta and a deficit of VD> beta making neurofeedback a therapeutic option, however is this true Theta VD> or is it slow alpha? Either way what would you recommend? VD> As usual any comments etc would be gratefully received VD> david VD> David J Vernon PhD VD> Dept. of Cognitive Neuroscience & Behaviour VD> Imperial College London VD> St Dunstan's Road VD> London VD> W6 8RP VD> Tel: 44 (0) 208 383 0584 VD> Fax: 44 (0) 208 846 1670 VD> -----Original Message----- VD> From: Joe Siri Ekgren [mailto:vennskap@xxxxxxxxx] VD> Sent: 09 April 2003 19:16 VD> To: wineeg@xxxxxxxxxxxxx VD> Subject: [wineeg] Latest version of WinEEG, solves time clock error VD> Dear Listmembers, VD> With the latest version of WinEEG, the software now records in real VD> time on laptops with Win98. (Previous versions ran at half speed, VD> i.e. a recording length of 60 WinEEG one second epochs took 160 VD> seconds in real time under Win98). The screen gets more jumpy on my VD> 500 Mhz laptop, and harder to read, so there is a price for VD> everything. VD> I can=B4t find an updated version number, but the new version is VD> exactly 1 699 480 bytes. VD> 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 >>later. >>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. VD> There is no download site, but I will be happy to forward this WinEEG VD> version to anyone interested. -- Best regards, Juri mailto:kropotov@xxxxxxxxxx