TABLE I.

Characteristics of study sample (n = 40)

Demographic data
Sex (male:female)	20:20
Age (years)	31.5 (10.4)
WAIS-R IQ	115.5 (15.9)
NEO-PI-R scores
Agreeableness	113 (21.8)
Conscientiousness	119.8 (32)
Extraversion	110.8 (22.3)
Neuroticism	84.8 (34)
Openness/Intellect	112.3 (13.7)
Behavioural Performance on the n-back task
Response time to 3-back (ms)	748 (224)
Accuracy for 3-back (% correct)	72.8 (16.1)

Continuous variables are presented as mean and standard deviation; WAIS-R = Wechsler Adult Intelligence Scale-Revised; IQ = Intelligence Quotient; ms = milliseconds.