# [Eeglablist] EEGLAB and Kimesch 1999 interpretation of Anchor Peak of IAF

Scott Makeig smakeig at gmail.com
Sat Jun 19 13:28:21 PDT 2021

Jens -

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).

Scott Makeig

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