Stroop Reaction Time Results. Mean reaction times (and standard error of the mean, after normalisation for subject effects) for conditions of the H2S run (left) and Eugenol run (right). In the left panel it is shown that the negative odorant only influenced the reactions time to incongruent stimuli (p = .031), leading to a reduced Stroop effect. Eugenol showed no effect on the measured response times. Note the apparent difference between incongruent trials in the 'air' blocks of both runs, which was not statistically significant (p = .343), however.
Finkelmeyer et al. BMC Neuroscience 2010 11:131 doi:10.1186/1471-2202-11-131