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<div id="yui_3_16_0_1_1417598505981_3731" class="" style="text-align:justify"><span id="yui_3_16_0_1_1417598505981_3908" class="" style="font-size:12.0pt;line-height:115%;font-family:"Times New Roman","serif";mso-ascii-theme-font:major-bidi;mso-hansi-theme-font:major-bidi;mso-bidi-theme-font:major-bidi">Dear
Experts,</span></div><div id="yui_3_16_0_1_1417598505981_3732" class="" style="text-align:justify"><span class="" style="font-size:12.0pt;line-height:115%;font-family:"Times New Roman","serif";mso-ascii-theme-font:major-bidi;mso-hansi-theme-font:major-bidi;mso-bidi-theme-font:major-bidi"><br></span></div>
<div id="yui_3_16_0_1_1417598505981_3728" class="" style="text-align:justify"><span id="yui_3_16_0_1_1417598505981_3727" class="" style="font-size:12.0pt;line-height:115%;font-family:"Times New Roman","serif";mso-ascii-theme-font:major-bidi;mso-hansi-theme-font:major-bidi;mso-bidi-theme-font:major-bidi">I
have noticed in some ERP experiments that the response is flipped in the
posterior part than anterior part of scalp. For example in checkerboard pattern
VEP, P100 response on mid occipital electrode and N100 response on the frontal
electrode.</span></div>
<div id="yui_3_16_0_1_1417598505981_3730" class="" style="text-align:justify"><span id="yui_3_16_0_1_1417598505981_3729" class="" style="font-size:12.0pt;line-height:115%;font-family:"Times New Roman","serif";mso-ascii-theme-font:major-bidi;mso-hansi-theme-font:major-bidi;mso-bidi-theme-font:major-bidi">According
to the discussion with colleagues they said that ERP response are usually from
the generation of a dipole, the field of which is picked up at different
electrode locations.<span id="yui_3_16_0_1_1417598505981_3913" class="" style="mso-spacerun:yes"> </span>Thus, some will
pick up the positive end, and others will pick up the negative end. This is
often called phase reversal, as the phase of waveform is 180 degrees reversed.</span></div><div id="yui_3_16_0_1_1417598505981_3740" class="" style="text-align:justify"><span id="yui_3_16_0_1_1417598505981_3729" class="" style="font-size:12.0pt;line-height:115%;font-family:"Times New Roman","serif";mso-ascii-theme-font:major-bidi;mso-hansi-theme-font:major-bidi;mso-bidi-theme-font:major-bidi"><br></span></div>
<div id="yui_3_16_0_1_1417598505981_3734" class="" style="text-align:justify"><span id="yui_3_16_0_1_1417598505981_3733" class="" style="font-size:12.0pt;line-height:115%;font-family:"Times New Roman","serif";mso-ascii-theme-font:major-bidi;mso-hansi-theme-font:major-bidi;mso-bidi-theme-font:major-bidi">My
question is, why the dipoles distribution is symmetric over the scalp?
According to my understanding there is an infinite number of dipoles may
contribute in a specific source.<span class="" style="mso-spacerun:yes"> </span>Is
there any justification (Please correct me if I’m wrong)?</span></div><div id="yui_3_16_0_1_1417598505981_3738" class="" style="text-align:justify"><span id="yui_3_16_0_1_1417598505981_3733" class="" style="font-size:12.0pt;line-height:115%;font-family:"Times New Roman","serif";mso-ascii-theme-font:major-bidi;mso-hansi-theme-font:major-bidi;mso-bidi-theme-font:major-bidi"><br></span></div>
<div id="yui_3_16_0_1_1417598505981_3735" class="" style="text-align:justify"><span id="yui_3_16_0_1_1417598505981_3736" class="" style="font-size:12.0pt;line-height:115%;font-family:"Times New Roman","serif";mso-ascii-theme-font:major-bidi;mso-hansi-theme-font:major-bidi;mso-bidi-theme-font:major-bidi">Also
why the volume conduction effect (transmission of electric current from primary
source electrode to other electrodes) can be seen in some experiments only
while it’s much less in some other experiment? What's the experimental factors
may effect on volume conduction?</span></div><div id="yui_3_16_0_1_1417598505981_3804"><br>
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</div><div id="yui_3_16_0_1_1417598505981_3800" class="" style="text-align:justify"><span id="yui_3_16_0_1_1417598505981_3802" class="" style="font-size:12.0pt;line-height:115%;font-family:"Times New Roman","serif";mso-ascii-theme-font:major-bidi;mso-hansi-theme-font:major-bidi;mso-bidi-theme-font:major-bidi">Thank you,</span></div><div id="yui_3_16_0_1_1417598505981_3805" class="" style="text-align:justify"><span id="yui_3_16_0_1_1417598505981_3802" class="" style="font-size:12.0pt;line-height:115%;font-family:"Times New Roman","serif";mso-ascii-theme-font:major-bidi;mso-hansi-theme-font:major-bidi;mso-bidi-theme-font:major-bidi"><br></span></div>
<div id="yui_3_16_0_1_1417598505981_3799" class="" style="text-align:justify"><span id="yui_3_16_0_1_1417598505981_3801" class="" style="font-size:12.0pt;line-height:115%;font-family:"Times New Roman","serif";mso-ascii-theme-font:major-bidi;mso-hansi-theme-font:major-bidi;mso-bidi-theme-font:major-bidi">AHMED</span></div>
<div></div><div id="yui_3_16_0_1_1417598505981_3271"> <div id="yui_3_16_0_1_1417598505981_3270"><br></div></div></div></div>