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<div style="direction: ltr;font-family: Tahoma;color: #000000;font-size: 10pt;">Hello Michele,
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<div>The first revision prototype utilizes a three (3) light pipe assembly in each ear, which is optically isolated from the photic stimulation device and interfacing hardware (the LEDs are about 12" from the subject and not placed directly into the ears with
this method). I think that EMI interference with the EEG electrodes can be safely ruled out with this approach as the only thing touching the subject is the EEG acquisition hardware on the scalp and the light pipes inserted into the ears, but more testing
is needed to validate that statement.</div>
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<div>In addition, the light pipes used for the initial prototype have 1mm jackets and with only about 2mm of actual light pipe exposed in the ear canal, so I don't think that the EEG results are biased from any interaction with the visual cortex based on the
light pipes being fully inserted into the ear canal and surrounded by an ear foam to prevent any light from leaking. But again, more testing is needed to rule out those possibilities.</div>
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<div id="divRpF118617" style="direction: ltr; "><font face="Tahoma" size="2" color="#000000"><b>From:</b> eeglablist-bounces@sccn.ucsd.edu [eeglablist-bounces@sccn.ucsd.edu] on behalf of Michele Barsotti [nomeserio@gmail.com]<br>
<b>Sent:</b> Thursday, October 11, 2012 4:18 AM<br>
<b>To:</b> eeglablist@sccn.ucsd.edu<br>
<b>Subject:</b> Re: [Eeglablist] Eyes-open EEG stimulation via the ear canals (Gregory Perry)<br>
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<div>Hi Gregory,<br>
I've visited the links you posted.<br>
I've got a question for you: <br>
how can you say that what you see in EEG tracks related to photic stimulation via ear channel is really a physiological response and not an electromagnetic artifact due to the leds?<br>
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cheers<br>
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Michele<br>
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From: Gregory Perry <<a href="mailto:Gregory.Perry@govirtual.tv" target="_blank">Gregory.Perry@govirtual.tv</a>><br>
To: "<a href="mailto:eeglablist@sccn.ucsd.edu" target="_blank">eeglablist@sccn.ucsd.edu</a>" <<a href="mailto:eeglablist@sccn.ucsd.edu" target="_blank">eeglablist@sccn.ucsd.edu</a>><br>
Cc: <br>
Date: Tue, 9 Oct 2012 22:19:06 +0000<br>
Subject: [Eeglablist] Eyes-open EEG stimulation via the ear canals<br>
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<div style="direction:ltr"><span style="font-size:10pt; font-family:Tahoma">Something of interest for the list members; I've been working on this photic stimulation system for about a year now, to facilitate EEG-research using an alternative to conventional
photic stimulation systems via the visual cortex:</span></div>
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<div style=""><a href="http://www.indiegogo.com/GoVirtualCognition?a=1579195" target="_blank">http://www.indiegogo.com/GoVirtualCognition?a=1579195</a></div>
<div style=""><a href="http://www.quirky.com/ideations/320242" target="_blank">http://www.quirky.com/ideations/320242</a></div>
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-- <br>
-Michele-<br>
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