Abstract: In the present experiment four groups of 14 high N scores, 14 low N scores, 16 introverts and 16 extraverts were chosen by using Eysenck Pe- rsonality Questionnaire (EPQ), and subjects' urine CA concentrations under both testing and resting conditions were estimated quantitatively (involving noradrenaline (NA), adrenaline (A), and dopamine (DA)). Before the test subjects assessed themselves according to Test Anxiety In- ventory (TAI). Relations among personality type, TAI scores and CA excretion were analysed and individual differences in stress response due to personality type were explored. The data showed that high N scores had a higher resting NA excre- tion than low N scores. Under the testing condition high N scores sho- wed a very signifficant increase in CA excretion, while the increase in low N scores was not signifficant. There were signifficant differences in CA excretion between high and low N scores. The data also showed that introverts had a higher NA and DA excretion than extraverts in stress situation. The introverts had higher TAI scores than the extraverts and high N scores than it's control group. The results indicate that personality type may be an important factor in stress response. Cognitive assessment and personal experience may ser- ve as mediators between personality and stress response.

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