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. 2011 Mar 15;6(3):e17752. doi: 10.1371/journal.pone.0017752

Table 4. Contingency table for perception of the thermal grill illusion (TGI).

Gender Category Low 5-HTT High 5-HTT
Male TGI-responder 5 4
Poor-responder 4 4
Female TGI- responder 2 12
Poor-responder 10 3

VAS-ratings of the sensory-discriminatory dimension (pain intensity) and the affective-motivational dimension (unpleasantness) were used in this tentative dichotomization of subjects. See section ‘TGI-response, sensory vs affective ratings’ for the criteria used.