Right-sided asymmetry in sensitivity to tickle

A standard tickle apparatus was used to apply stimuli to the soles of left and right feet of subjects. Subject ratings of the strength of the tickle sensation felt after each stimulus revealed that the right foot was significantly more sensitive than the left. This effect was independent of both hand and foot preference. The results are discussed in relation to other findings on lateralisation, and it is suggested that they are consistent with evidence that the left hemisphere is more involved in positive emotions.