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Daniel Mathalon wrote:
<blockquote cite="midp06230933c0a3abe4267b@%5B130.132.103.103%5D"
type="cite">
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<title>Re: [Eeglablist] channel
cross-coherence</title>
<div>Dear EEGLAB gurus,</div>
<div><br>
</div>
<div>There were a couple of recent posts (see below) regarding
cross-channel coherence analyses. It is unclear what the
distinction is between phase coherence and linear coherence, and it
seems that neither of them calculates pure phase synchrony (as is done
with the Lachaux et al method).</div>
</blockquote>
Phase coherence calculates PURE phase synchrony (which is independent
of signal amplitude). Linear coherence takes indeed phase as well as
amplitude information. Amplitude correlation would take into account
only amplitude information. For the exact formula of phase coherence
and linear coherence, see <a class="moz-txt-link-freetext" href="http://repositories.cdlib.org/postprints/357/">http://repositories.cdlib.org/postprints/357/</a><br>
<br>
I do not know exactly which one of Jean Philippe Lachaux method you are
refering to. His main method I think relates to studying phase
coherence (or ITC/phase locking factor) in single trial using binary
ERP-image like display. Eugenio Rodrigues is working a plugin with
these functions for EEGLAB (do not hesitate to email him to motivate
him).<br>
<br>
Best regards,<br>
<br>
Arno<br>
<blockquote cite="midp06230933c0a3abe4267b@%5B130.132.103.103%5D"
type="cite">
<div>Can someone comment on how these
cross-channel coherences are calculated and whether there is a plan to
add a pure cross-channel phase synchrony measure to EEGLAB?</div>
<div><br>
</div>
<div>Thanks,</div>
<div><br>
Dan Mathalon</div>
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