[Eeglablist] EEGLAB and Kimesch 1999 interpretation of Anchor Peak of IAF
smakeig at gmail.com
Sat Jun 19 13:28:21 PDT 2021
Just to note: You might consult this poster
<https://sccn.ucsd.edu/~julie/AlphaPosterMini.pdf>by Julie Onton showing
that the Individual Alpha Frequency is far from an established fact, as for
many subjects (and, no doubt, situations) detailed data-driven source
analysis (ICA) and frequency mode analysis (IMAT plugin) show that a
single subject may have alpha sources with different peak frequencies, and
(2) alpha peak frequency varies across time (as also noted by Klimesch).
On Sat, Jun 19, 2021 at 4:18 PM Jens Eymann via eeglablist <
eeglablist at sccn.ucsd.edu> wrote:
> Dear Members
> I want to implement a version of Kimesch (1999) IAF and TF on EEGLAB/Matlab
> What is IAF and TF:
> IAF is an anchor-frequency-peak, which is located in the alpha-Range.
> Every individual has another different anchor, which ist he highest
> power peak in this alpha range. This peak can be change i.e. of age or
> cognitive functions.
> From this Peak on, the upper alpha-Range is covering 2hz. The
> Theata-Range starts from the ancor by -4hz to -6hz, in Relation the the
> alpha peak.
> This means, at the end I want the relative ranges of theata (-6hz,-4hz)
> and of upper alpha (0hz, +2hz) in Relation tot he anchor or peak point.
> >>How can I identify them with in an EEG and convert them to a spectral
> analysis on EEGLAB? First the Alpha-Peak, then the two ranges?
> Secondly, I do a reading task over 15 minutes. This has no explicit
> ERPs, but I want to separate them into 15 units, every unit a minute long.
> >>How can I seperate them for the purpose written below?
> At the end, for this study, I need the ERD(esync) auf Alpha, per Person
> and per Unit (1 to 15), and I need the ERS(ync) of Theta, per Person and
> per Unit (1 to 15). A Unit is 1 minute long.
> These Data will be transfered to SPSS, and will be statisticly analysed.
> The Formula will
> Theta[Pi;Tj]/Alpha[Pi;Tj], i=1 to 16 by Persons, and j=1 to 15 by 15
> time units.
> Please can you help me, by naming some similar trials, keywords, or even
> code for Matlab or EEGLAB? Or any structured to-do list?
> Thank you very much,
> Jens Eymann
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Scott Makeig, Research Scientist and Director, Swartz Center for
Computational Neuroscience, Institute for Neural Computation, University of
California San Diego, La Jolla CA 92093-0559, http://sccn.ucsd.edu/~scott
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