<html><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:13px"><div id="yui_3_16_0_1_1434820375275_7258"><span id="yui_3_16_0_1_1434820375275_7669">Dear All,</span></div><div id="yui_3_16_0_1_1434820375275_7260"><br></div><div dir="ltr" id="yui_3_16_0_1_1434820375275_7306">I can I see i variety of ERP experiments some researcher used very wide range of participant may exceed 100 samples.</div><div id="yui_3_16_0_1_1434820375275_7472" dir="ltr">While some others deals with limited number of samples which maybe around 12 subjects.</div><div id="yui_3_16_0_1_1434820375275_7429" dir="ltr">My question is:<br></div><div id="yui_3_16_0_1_1434820375275_7428" dir="ltr">How much the minimum size of subject is required in an ERP experiment?</div><div id="yui_3_16_0_1_1434820375275_7441" dir="ltr">What is the criteria to choose the number of participants?</div><div id="yui_3_16_0_1_1434820375275_7507" dir="ltr">If so how to calculate it statistically?<br><span></span></div><div id="yui_3_16_0_1_1434820375275_7261"><br><span></span></div><div id="yui_3_16_0_1_1434820375275_7508"><span></span></div><div id="yui_3_16_0_1_1434820375275_7205"> I have goggled it and find some suggest around 30-40 subjects. as in the following link<br></div><div id="yui_3_16_0_1_1434820375275_7207" class="signature"><div id="yui_3_16_0_1_1434820375275_7558" dir="ltr"> <a id="yui_3_16_0_1_1434820375275_7556" href="http://www.sandsresearch.com/WhitePaperSampleSize.aspx">Sands Research - White Paper: Sample Size Analysis for Brainwave Collection (EEG) Methodologies</a></div><div id="yui_3_16_0_1_1434820375275_7595" dir="ltr"><br></div></div><div style="width:450px; font-family: 'Georgia', 'Times', 'Times New Roman', 'serif';margin-top:5px; margin-bottom: 5px; background-color: #ffffff;" id="enhancrCard_0" class="link-enhancr-attachment link-enhancr-element " contenteditable="false"><table id="yui_3_16_0_1_1434820375275_7594" class="link-enhancr-element" style="width:450px; height:170px; position: relative; display: block;" border="0" cellpadding="0" cellspacing="0"><tbody id="yui_3_16_0_1_1434820375275_7593"><tr id="yui_3_16_0_1_1434820375275_7624" class="link-enhancr-element"><td id="yui_3_16_0_1_1434820375275_7623" class="link-enhancr-element" colspan="8" style="height: 1px; background-color: #e5e5e5; font-size: 1px; border-collapse: collapse;"><div id="yui_3_16_0_1_1434820375275_7622" class="link-enhancr-element" style="height: 1px; background-color: #e5e5e5; font-size: 1px; line-height:0px;"> </div></td></tr><tr id="yui_3_16_0_1_1434820375275_7592" class="link-enhancr-element"><td rowspan="5" class="link-enhancr-element" style="width: 1px; background-color: #e5e5e5; font-size: 1pt; border-collapse: collapse;"><div class="link-enhancr-element" style="width: 1px; background-color: #e5e5e5; font-size: 1pt;"> </div></td><td id="yui_3_16_0_1_1434820375275_7640" class="link-enhancr-element link-enhancr-image-wrap" rowspan="5" style="vertical-align: middle; width: 168px; height: 168px; background-color: #000000;border-collapse: collapse;"><div id="yui_3_16_0_1_1434820375275_7643" class="link-enhancr-element" style="width: 168px;" align="center"><a id="yui_3_16_0_1_1434820375275_7642" href="http://www.sandsresearch.com/WhitePaperSampleSize.aspx" class="link-enhancr-card-urlWrapper link-enhancr-element" style="text-decoration: none !important; color: #000000 !important;"><img id="yui_3_16_0_1_1434820375275_7641" data-id="2e4acaf5-0c77-de93-2d99-d35c95074e9c" alt="image" src="http://www.sandsresearch.com/samplesizegraph.jpg" class="link-enhancr-thumbnail-image link-enhancr-element yahoo-ignore-inline-image" style="display: block; margin: auto;" height="101" width="168"></a></div></td><td rowspan="5" class="link-enhancr-element" style="width: 1px; background-color: #e5e5e5; font-size: 0pt; border-collapse: collapse;"><div class="link-enhancr-element" style="width: 1px; background-color: #e5e5e5; font-size: 1pt;"> </div></td><td id="yui_3_16_0_1_1434820375275_7645" rowspan="5" class="link-enhancr-element" style="width: 14px; background-color: #ffffff; font-size: 0pt; border-collapse: collapse;"><div class="link-enhancr-element" style="width: 14px; background-color: #ffffff; font-size: 14pt;"> </div></td><td id="yui_3_16_0_1_1434820375275_7694" colspan="2" class="link-enhancr-element" style="height: 6px; background-color: #ffffff; font-size: 0pt; border-collapse: collapse;"><div id="yui_3_16_0_1_1434820375275_7693" class="link-enhancr-element" style="height: 6px; background-color: #ffffff; font-size: 6pt;"> </div></td><td id="yui_3_16_0_1_1434820375275_7591" rowspan="5" class="link-enhancr-element" style="width: 20px; background-color: #ffffff; font-size: 0pt; border-collapse: collapse;"><div class="link-enhancr-element" style="width: 20px; background-color: #ffffff; font-size: 20pt;"> </div></td><td class="link-enhancr-element" rowspan="5" style="width: 1px; background-color: #e5e5e5; font-size: 1pt; border-collapse: collapse;" width="1"><div class="link-enhancr-element" style="width: 1px; background-color: #e5e5e5; font-size: 1pt;"> </div></td></tr><tr id="yui_3_16_0_1_1434820375275_7598"><td id="yui_3_16_0_1_1434820375275_7597" class="link-enhancr-element" colspan="2" style="width: 100%; vertical-align: middle; font-family: 'Georgia', 'Times', 'Times New Roman', 'serif';"><div id="yui_3_16_0_1_1434820375275_7602" class="link-enhancr-text-part link-enhancr-element" style="line-height:16.5px; background-color: #ffffff; height: 135px; width: 245px;"><div id="yui_3_16_0_1_1434820375275_7601" class="link-enhancr-element" style="word-wrap: break-word; word-break: break-all;"><span class="link-enhancr-element icon icon-shrink link-enhancr-toggle"></span><span id="yui_3_16_0_1_1434820375275_7621" class="link-enhancr-element icon icon-close link-enhancr-delete"></span><a id="yui_3_16_0_1_1434820375275_7600" href="http://www.sandsresearch.com/WhitePaperSampleSize.aspx" class="link-enhancr-card-urlWrapper link-enhancr-element" style="text-decoration: none !important; color: #000000 !important; line-height: 100%; font-size: 18px; display: block;"><span id="yui_3_16_0_1_1434820375275_7599" class="link-enhancr-element link-enhancr-card-title" style="margin: 0; font-weight: normal;margin-bottom: 3px; font-size: 18px; line-height: 21px; max-height: 43px; color: #000000; overflow: hidden !important; display: inline-block;">Sands Research - White Paper: Sample Size Analysis for B...</span></a></div></div></td></tr><tr id="yui_3_16_0_1_1434820375275_7620"><td id="yui_3_16_0_1_1434820375275_7619" colspan="2" class="link-enhancr-element" style="height: 4px; background-color: #ffffff; font-size: 0pt; border-collapse: collapse;"><div id="yui_3_16_0_1_1434820375275_7618" class="link-enhancr-element" style="height: 4px; background-color: #ffffff; font-size: 4pt;"></div></td></tr><tr id="yui_3_16_0_1_1434820375275_7608"><td id="yui_3_16_0_1_1434820375275_7607" class="link-enhancr-element" style="vertical-align: middle; font-family: 'Arial', 'Helvetica Neue', 'Helvetica', 'sans-serif';"><div id="yui_3_16_0_1_1434820375275_7606" class="link-enhancr-element" style="font-size: 0pt;"><a id="yui_3_16_0_1_1434820375275_7605" href="http://www.sandsresearch.com/WhitePaperSampleSize.aspx" class="link-enhancr-card-url link-enhancr-element" style="color: black; text-decoration: none !important;cursor:pointer !important;" target="_blank"><span id="yui_3_16_0_1_1434820375275_7573" class="link-enhancr-element link-enhancr-view-on" style="display: inline-block; line-height: 11px; max-width: 145px; min-width: 85px; overflow: hidden; max-height: 13px; word-break: break-all;"><span id="yui_3_16_0_1_1434820375275_7604" class="link-enhancr-element link-enhancr-mobile-no-resize" style="vertical-align:middle; font-size: 9px; line-height: 11px; color: #999999; -moz-text-size-adjust: none; -ms-text-size-adjust: none; -webkit-text-size-adjust:none; text-size-adjust:none;">View on <span id="yui_3_16_0_1_1434820375275_7603" style="font-weight: bold" class="link-enhancr-view-on-domain">www.sandsresearch...</span></span></span></a></div></td><td id="yui_3_16_0_1_1434820375275_7617" class="link-enhancr-element" style="vertical-align: middle; width: 100px; font-family: 'Arial', 'Helvetica Neue', 'Helvetica', 'sans-serif';"><div id="yui_3_16_0_1_1434820375275_7616" class="link-enhancr-element link-enhancr-preview-wrapper" style="max-width: 100px; min-width: 80px; overflow: hidden; text-align: right; line-height: 11px; max-height: 13px; font-size: 0pt;"><span id="yui_3_16_0_1_1434820375275_7615" class="link-enhancr-element link-enhancr-preview-by link-enhancr-mobile-no-resize" style="vertical-align:middle; font-size: 9px; line-height: 11px; color: #999999; -moz-text-size-adjust: none; -ms-text-size-adjust: none; -webkit-text-size-adjust:none; text-size-adjust:none;">Preview by Yahoo</span></div></td></tr><tr id="yui_3_16_0_1_1434820375275_7611"><td id="yui_3_16_0_1_1434820375275_7610" colspan="2" class="link-enhancr-element" style="height: 9px; background-color: #ffffff; font-size: 0pt; border-collapse: collapse;"><div id="yui_3_16_0_1_1434820375275_7609" class="link-enhancr-element" style="height: 9px; background-color: #ffffff; font-size: 9pt;"></div></td></tr><tr id="yui_3_16_0_1_1434820375275_7614" class="link-enhancr-element"><td id="yui_3_16_0_1_1434820375275_7613" class="link-enhancr-element" colspan="8" style="height: 1px; background-color: #e5e5e5; font-size: 1px; border-collapse: collapse;"><div id="yui_3_16_0_1_1434820375275_7612" class="link-enhancr-element" style="height: 1px; background-color: #e5e5e5; font-size: 1px; line-height:0px"> </div></td></tr></tbody></table></div><div id="yui_3_16_0_1_1434820375275_7207"><br></div><div id="yui_3_16_0_1_1434820375275_7695"><br></div><div dir="ltr" id="yui_3_16_0_1_1434820375275_7696">Please share your comments..</div><div id="yui_3_16_0_1_1434820375275_7697" dir="ltr"><br></div><div id="yui_3_16_0_1_1434820375275_7750" dir="ltr"><br></div><div id="yui_3_16_0_1_1434820375275_7698" dir="ltr"><b>Ahmed Almurshedi</b></div><div id="yui_3_16_0_1_1434820375275_7718" dir="ltr"> </div><div style="" id="yui_3_16_0_1_1434820375275_7207" class=""> </div></div></body></html>