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<p>modified by ongoing visual feedback.</p>

<p><big>Measurement</big></p>
<p>There are two basic methods for recording smooth pursuit eye movements, and eye movement in general. The first is with a <a href="page.php?w=search_coil">search coil</a>. This technique is most common in <a href="page.php?w=primate">primate</a> research, and is extremely accurate. An eye movement shifts the orientation of the coil to induce an electric current, which is translated into horizontal and vertical eye position. The second technique is an <a href="page.php?w=eye_tracker">eye tracker</a>.</p><p>
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