Abstract Eysenck has reported a strong correlation between introversion-extraversion and salivary response to fresh lemon juice. In two experiments described here this correlation was not significant. The first experiment consisted of translating and validating the EPI in Dutch, and testing the salivary response to lemon juice. The second experiment tested salivary response to seven substances: water, apple juice, grapefruit juice, vinegar, fresh lemon juice, preserved lemon juice, and citric acid. On the basis of subjective ratings, pH values and salivary response, the substances were ranked in strength. No evidence was found of S s reaching transmarginal inhibition. There was no significant difference between introverts and extraverts. Test-retest of response to lemon given twice was r = 0.54.