I&#39;d also be very interested to hear about good reinotopic stimuli; we&#39;ve used 6Hz and 14 ring sizes for eccentricity mapping in the past.<br><br>Thomas Ballinger<br><br><div class="gmail_quote">On Thu, Jul 7, 2011 at 3:56 AM, Anders Hougaard <span dir="ltr">&lt;<a href="mailto:ahougaard@dadlnet.dk">ahougaard@dadlnet.dk</a>&gt;</span> wrote:<br>

<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"><div>Dear freesurfers,</div>
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<div>Which stimuli do you think provide the best retinotopic maps?</div>
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<div>I have done a retinotopy analysis using the following stimuli:</div>
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<div>Polar angle:</div>
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<div>- 45 deg counter-clockwise rotating wedge</div>
<div>- 8 unique positions</div>
<div>- flickering at 2 Hz</div>
<div>- stimulation period: 36 sec</div>
<div>- no. of cycles: 6</div>
<div>- TR = 3</div>
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<div>Eccentricity:</div>
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<div>
<div>- expanding ring</div>
<div>- 8 unique positions</div>
<div>- flickering at 2 Hz</div>
<div>- stimulation period: 36 sec</div>
<div>- no. of cycles: 6</div>
<div>- TR = 3<br><br>Any suggestions on how to optimize this stimulation?<br>E.g. different period length, more runs, bi-directional, different TR<br><br>Thank you!<br><br>Best regards,<br><br>Anders<br></div></div>
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