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(A) A schematic of the covert tainting device used for AND and EST. The non-shaking hand covertly activated a modified watch on the shaking hand that then emitted a plume of odor during handshake. (B) Face-touching behavior following tainting. Duration change scores are after individual-baseline normalization only. Error bars are standard error. **p < 0.01. *p < 0.05.
