Hi,<div><br></div><div>I have another silly question. When a functional overlay (say, log p-value map) is loaded to tksurfer, how exactly are the surface vertex values computed? using simple interpolation of the loaded map? or is it something</div>

<div>more fancier, like looking along the normal of each surface face and taking the maximum/minimum?</div><div>The reason I&#39;m asking is because if surface vertices are interpolated exactly using the loaded volume, they don&#39;t fall on gray matter (right? either I use the white matter surface or the pial surface, where activation should be in between...)</div>

<div><br></div><div>Thanks in advance,</div><div><br></div><div>Shay </div><div>Tsao Lab</div><div>Caltech</div><div><br></div><div><br></div>