Hello Naeem, <div>Some quick thoughts...</div><div>These are very early days indeed for two-or more brain studies,<div>especially using EEG, although various groups are making inroads,</div><div>see recent work Dumas, from Tognoni, and from Babiloni's groups,</div>
<div>among others, all of which use diverse methods with EEG.</div><div>If you are using ICA, why not decompose</div><div>each person's data separately, without PCA,</div><div>and then analyze correlations</div><div>
between similar ICs across the </div>
<div>two individuals, across particular</div><div>conditions. "Similar" ICs may be </div><div>determined via eeglab's study clustering function (which uses PCA)</div><div>or with the CORRMAP plugin.</div><div>
Calhoun et al.'s EEGIFT with group-ICA</div><div>certainly looks like an interesting</div><div>option (attached). </div><div>Overall, the field is wide open for suggestions,</div><div>so if you come across some new solutions,</div>
<div><b>please let the list know!</b></div><div>An important point is whether </div><div>you use measures external to EEG </div><div>to assess some behavioral metric coordination.</div><div>Overall the issue is what you are hunting for.</div>
<div>See also Hasson and others' forays into </div><div>cross-correlation across brains.</div><div>I've included some brain based citation below which might be of use to you,</div><div>as well as some non-brain literature that bears directly on two-person or more studies. good luck</div>
<div><p style><em><font color="#000000"><font face="ARial, sans-serif"><font><span lang="fr-FR"><span style="font-style:normal"><span style="text-decoration:none">Anders et al., (2011). Flow of affective information between communicating brains. NeuroImage 54, 439–446.</span></span></span></font></font></font></em></p>
<p style><font color="#000000"><font face="ARial, sans-serif"><font><span lang="en-US"><span style="text-decoration:none">Astolfi L, Toppi J, De Vico Fallani F, Vecchiato G, Salinari S, Mattia D, Cincotti F, Babiloni F. (2010). Neuroelectrical Hyperscanning Measures Simultaneous Brain Activity in Humans. </span></span></font></font></font><font color="#000000"><font face="ARial, sans-serif"><font><span style="text-decoration:none">Brain Topography</span></font></font></font><font color="#000000"><font face="ARial, sans-serif"><font><span lang="fr-FR"><span style="text-decoration:none">, </span></span></font></font></font><a href="http://www.springerlink.com/content/m7t53m267n3m5286/" target="_blank" style="color:rgb(17,85,204)"><font color="#000000"><font face="ARial, sans-serif"><font><span style="text-decoration:none">23 (3), 243-256</span></font></font></font></a><font color="#000000"><font face="ARial, sans-serif"><font><span lang="fr-FR"><span style="text-decoration:none">, 2010.</span></span></font></font></font></p>
<p style></p><p style="font-size:13px;margin-left:0.51in"><font face="ARial, sans-serif"><font><span lang="fr-FR"><span style="background-image:initial;background-color:transparent;background-repeat:initial initial">Dumas G</span></span><span lang="fr-FR">, Nadel J, Soussignan R, Martinerie J, Garnero L (2010) Inter-Brain Synchronization during Social Interaction. PLoS</span><font color="#000000"><span lang="fr-FR"><span style="text-decoration:none"> ONE 5(8): e12166</span></span></font></font></font></p>
<p style="font-size:13px;margin-left:0.51in"></p><p style="font-size:13px;margin-left:0.51in"><em><font color="#000000"><font face="ARial, sans-serif"><font><span lang="en-US"><span style="font-style:normal"><span style="text-decoration:none">Schilbach</span></span></span></font></font></font></em><font color="#000000"><font face="ARial, sans-serif"><font><span lang="en-US"><span style="text-decoration:none"> L, Wilms M, Eickhoff SB, Romanzetti S, Tepest R, Bente G, Shah NJ, Fink GR, Vogeley K (2009) </span></span></font></font></font><em><font color="#000000"><font face="ARial, sans-serif"><font><span lang="en-US"><span style="font-style:normal"><span style="text-decoration:none">Minds Made for Sharing</span></span></span></font></font></font></em><font color="#000000"><font face="ARial, sans-serif"><font><span lang="en-US"><span style="text-decoration:none">: </span></span></font></font></font><em><font color="#000000"><font face="ARial, sans-serif"><font><span lang="en-US"><span style="font-style:normal"><span style="text-decoration:none">Initiating Joint Attention Recruits Reward</span></span></span></font></font></font></em><font color="#000000"><font face="ARial, sans-serif"><font><span lang="en-US"><span style="text-decoration:none">-</span></span></font></font></font><em><font color="#000000"><font face="ARial, sans-serif"><font><span lang="en-US"><span style="font-style:normal"><span style="text-decoration:none">related Neurocircuitry</span></span></span></font></font></font></em><font color="#000000"><font face="ARial, sans-serif"><font><span lang="en-US"><span style="text-decoration:none">. Journal of Cognitive Neuroscience 0:</span></span></font></font></font><em><font color="#000000"><font face="ARial, sans-serif"><font><span lang="en-US"><span style="font-style:normal"><span style="text-decoration:none">1-14</span></span></span></font></font></font></em><font color="#000000"><font face="ARial, sans-serif"><font><span lang="en-US"><span style="text-decoration:none">. </span></span></font></font></font></p>
<p lang="fr-FR" style="font-size:13px;margin-left:0.51in;text-decoration:none"><font color="#000000"><font face="ARial, sans-serif"><font>Schippers MB, Roebroeck A, Renken R, Nanetti L, Keysers C. (2010). "Mapping the Information flow from one brain to another during gestural communication". Proc Natl Acad Sci U S A. 2010 May 18;107(20):9388-93.</font></font></font></p>
<p lang="en-US" style="font-size:13px;margin-left:0.51in;text-decoration:none"><font color="#000000"><font face="ARial, sans-serif"><font>Stephens, J. G., Silbert, J. L. & Hasson, U. (2010). Speaker–listener neural coupling underlies successful communication. PNAS, July 27.</font></font></font></p>
<p style="font-size:13px;margin-left:0.51in;text-decoration:none"><font color="#000000"><font face="ARial, sans-serif"><font><span lang="fr-FR">Tognoli, E., J. Lagarde, et al. (2007). "The phi complex as a neuromarker of human social coordination." Proc Natl Acad Sci U S A </span><span lang="fr-FR">104</span><span lang="fr-FR">(19): 8190-5.</span></font></font></font></p>
<p style="font-size:13px;margin-left:0.51in;text-decoration:none"><font color="#000000"><font face="ARial, sans-serif"><font><span lang="fr-FR"><br></span></font></font></font></p><p style="font-size:13px;margin-left:0.51in;text-decoration:none">
</p><p lang="en-US" style="font-size:13px;margin-left:0.49in;margin-bottom:0in;text-decoration:none"><font color="#222222"><font face="ARial, sans-serif"><font>Carletta, J., Hill, R. L., Nicol, C., Taylor, T., de Ruiter, J. P., & Bard, E. G. (2010). Eye tracking for two-person tasks with manipulation of a virtual world. Behavior Research Methods, 42, 254-265. </font></font></font></p>
<p lang="en-US" style="font-size:13px;margin-left:0.51in;margin-bottom:0in;text-decoration:none"><font color="#222222"><font face="ARial, sans-serif"><font>Wilms M, Schilbach L, Pfeiffer U, Bente G, Fink GR, Vogeley K: (2010). It´s in your eyes. Using gaze-contingent stimuli to create truly interactive paradigms for social cognitive and affective neuroscience. Social Cognitive and Affective Neuroscience 5, 98-107</font></font></font></p>
<p></p><p></p><div><font face="ARial, sans-serif"><font><font color="#000000"><span lang="fr-FR"><span style="text-decoration:none"><br></span></span></font></font></font></div><div><font face="ARial, sans-serif"><font><font color="#000000"><span lang="fr-FR"><span style="text-decoration:none"><br>
</span></span></font></font></font></div><div><font face="ARial, sans-serif"><font><font color="#000000"><span lang="fr-FR"><span style="text-decoration:none"><br></span></span></font></font></font></div><div><p lang="fr-FR" style="font-size:13px;margin-left:0.51in;text-decoration:none">
<font color="#000000"><font face="ARial, sans-serif"><font>Kelso J.A.S, de Guzman G.C., Reveley C., Tognoli E. (2009) Virtual Partner Interaction (VPI): Exploring Novel Behaviors via Coordination Dynamics. PLoS ONE 4(6) e5749.</font></font></font></p>
<p style="font-size:13px;margin-left:0.51in"><em><font color="#000000"><font face="ARial, sans-serif"><font><span lang="fr-FR"><span style="font-style:normal"><span style="text-decoration:none">Keysers C, Kaas J, Gazzola V. (2010). "Somatosensation in Social Perception." Nature Reviews Neuroscience. 2010 Jun;11(6):417-28. </span></span></span></font></font></font></em></p>
<p lang="fr-FR" style="font-size:13px;margin-left:0.51in;text-decoration:none"><font color="#000000"><font face="ARial, sans-serif"><font>Knoblich, G., Butterfill, S., & Sebanz, N. (2011). Psychological research on joint action: theory and data . In B. Ross (Ed.),The Psychology of Learning and Motivation, 54 (pp. 59-101), Burlington: Academic Press.</font></font></font></p>
<p lang="fr-FR" style="font-size:13px;margin-left:0.51in;text-decoration:none"><font color="#000000"><font face="ARial, sans-serif"><font>Kokal I, Keysers C. Granger causality mapping during joint actions reveals evidence for forward models that could overcome sensory-motor delays. PLoS One. 2010 Oct 21;5(10):e13507.</font></font></font></p>
<p lang="fr-FR" style="font-size:13px;margin-left:0.51in;text-decoration:none"><font color="#000000"><font face="ARial, sans-serif"><font>Marsh, K. L., Johnston, L., Richardson, M. J., & Schmidt, R. C. (2009). Hop off the mirror neuron bandwagon and join ours, it’s less crowded! European Journal of Social Psychology, 39, 1234-1235.</font></font></font></p>
<p lang="fr-FR" style="font-size:13px;margin-left:0.51in;text-decoration:none"><font color="#000000"><font face="ARial, sans-serif"><font>Oullier, O., G. C. de Guzman, et al. (2007). "Social coordination dynamics: Measuring human bonding." Social Neuroscience 99999(1): 1 – 15.</font></font></font></p>
<p lang="fr-FR" style="font-size:13px;margin-left:0.51in;text-decoration:none"><font color="#000000"><font face="ARial, sans-serif"><font>Perry, A., Stein, L., & Bentin, S. (2011). Motor and attentional mechanisms involved in social interaction: Evidence from mu and alpha EEG suppression. Neuroimage, 58, 895-904. DOI <a href="http://dx.doi.org/10.1016/j.neuroimage.2011.06.060" target="_blank" style="color:rgb(17,85,204)">http://dx.doi.org/10.1016/j.neuroimage.2011.06.060</a></font></font></font></p>
<p lang="fr-FR" style="font-size:13px;margin-left:0.51in;text-decoration:none"><font color="#000000"><font face="ARial, sans-serif"><font>Richardson, M. J., K. L. Marsh, et al. (2007). "Rocking together: dynamics of intentional and unintentional interpersonal coordination." Hum Mov Sci (6): 867-91.</font></font></font></p>
<p lang="fr-FR" style="font-size:13px;margin-left:0.51in;text-decoration:none"><font color="#000000"><font face="ARial, sans-serif"><font>Richardson, M. J., Marsh, K. L., & Schmidt, R. C. (2010). Challenging the egocentric view of perceiving, acting, and knowing. In L. Feldman Barrett, B. Mesquita, & E. Smith (Eds), The mind in context (pp. 307-333). New York: Guilford Press.</font></font></font></p>
<p lang="fr-FR" style="font-size:13px;margin-left:0.51in;text-decoration:none"><font color="#000000"><font face="ARial, sans-serif"><font>Richardson, M. J., Marsh, K. L., Isenhower, R., Goodman, J., & Schmidt, R. C. (2007). Rocking together: Dynamics of intentional and unintentional interpersonal coordination. Human Movement Science, 26, 867-891.</font></font></font></p>
<p lang="fr-FR" style="font-size:13px;margin-left:0.51in;text-decoration:none"><font color="#000000"><font face="ARial, sans-serif"><font>Richardson, MJ., van der Wel, R.P.R.D., Knoblich, G., & Sebanz, N. (in press). Let the force be with us: Dyads exploit haptic coupling for coordination . Journal of Experimental Psychology: Human Perception and Performance.</font></font></font></p>
</div><div><font color="#000000"><font face="ARial, sans-serif"><font><br></font></font></font></div><p></p></div><div><div>
<br><br><div class="gmail_quote">On Tue, Jan 24, 2012 at 5:31 AM, muhammad naeem <span dir="ltr"><<a href="mailto:naeem6500@yahoo.com">naeem6500@yahoo.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<table cellspacing="0" cellpadding="0" border="0"><tbody><tr><td valign="top" style="font:inherit">Hi EEGlablist,<br>
<br>
In an EEG paradigm concerning two-person social interaction I am trying a
joint ICA approach (e.g: Calhoun and colleagues-NeuroImage 45 (2009)
S163–S172 and computational Intelligence and Neuroscience
doi:10.1155/2011/129365 ). A similar approach has been used in other
studies (e.g Montague and colleagues- NeuroImage 16, 1159–1164
(2002)doi:10.1006/nimg.2002.1150). Essential difference between two is
the arrangement of Data. In the first, virtual channels have been
created (separate sphering process and PCA ) whereas in the second data of two subjects were concatenated
giving lesser (half ) IC's to investigate. I am wondering which
approach is more appropriate and why? <br>
<br>
A subsequent question is regarding data reduction- PCA is usually used
but as mentioned in the first references may not be suitable for the
activities which are not time/phase-locked(as the case with my data).
What are the other options?<br>
<br>
Looking forward to your insight.<br>
<br>
Best regards,<br>
<br>
Naeem.</td></tr></tbody></table><br>_______________________________________________<br>
Eeglablist page: <a href="http://sccn.ucsd.edu/eeglab/eeglabmail.html" target="_blank">http://sccn.ucsd.edu/eeglab/eeglabmail.html</a><br>
To unsubscribe, send an empty email to <a href="mailto:eeglablist-unsubscribe@sccn.ucsd.edu">eeglablist-unsubscribe@sccn.ucsd.edu</a><br>
For digest mode, send an email with the subject "set digest mime" to <a href="mailto:eeglablist-request@sccn.ucsd.edu">eeglablist-request@sccn.ucsd.edu</a><br></blockquote></div><br></div></div></div>