</font><blockquote><div id="quote"><font class="small">Quote:</font>
teejai said:
Dileo says that the difficulty Vietnam veterans suffering PTSD have in putting the name to a smell may be indicative of weakness in brain pathways related to emotional processing. He says the same areas in the frontal region of the brain that are involved in identifying smells are also involved in regulating emotion.

</div></font></blockquote><font class="post"> I would think this could be related to some depressions and other mental illnesses too.

But the test isn't about whether one can smell or not, but whether one can identify smells (can smell it fine, but what is it?). If one can't smell well because of damage to olofactory or other related organs/processes, then one wouldn't have been included in this study.