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Many odorants stimulate the trigeminal nerve at high, but not low, concentrations, and trigeminal stimulation produces hot, cold, itching, tingling, or electric feelings that are spatially localizable. What has been under debate is whether internostril differences yield directionality in human olfaction without involving the trigeminal system. To address this issue, we employed two odorants that are well accepted as nontrigeminal—phenylethyl alcohol and vanillin—and demonstrated that an intermediate internostril difference in odor intensity produces a reliable spatial cue that subconsciously guides navigation (1). We thank Croy and Hummel (2) for their response to our work, where they raise a concern that the findings could result from trigeminal stimulation. The argument, however, appears to be based on a misinterpretation of our data and is not backed up by the existing literature, including some of their own studies. Moreover, if the heading … [↵][1]1To whom correspondence may be addressed. Email: zhouw{at}psych.ac.cn. [1]: #xref-corresp-1-1

Reply to Croy and Hummel: Stereo smelling without involvement of nasal trigeminal function