<p><img src="https://imgs.xkcd.com/comics/selection_effect.png" alt="fMRI testing showed that subjects who don&#x27;t agree to participate are much more likely to escape from the machine mid-scan."></p>
<blockquote>
<p>"<a href="https://xkcd.com/1999/">Selection Effect</a>", by Randall Munroe, licensed under Creative Commons Attribution-NonCommercial 2.5 License</p>
</blockquote>
<h2 id="alt-text"><a aria-hidden="true" class="anchor-heading" href="#alt-text"><svg aria-hidden="true" viewBox="0 0 16 16"><use xlink:href="#svg-link"></use></svg></a>Alt Text</h2>
<p>fMRI testing showed that subjects who don't agree to participate are much more likely to escape from the machine mid-scan.</p>

xkcd

Selection Effect


# XKCD

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