Objectives:
To investigate bipolar traits and impulsiveness in pathological gamblers, compared to non-pathological gamblers and non-gambling general population. To investigate interaction between traits of affective temperament, impulsiveness and the severity of pathological gambling.

Methods:
139 participants (63 women, 76 men; mean age: 30.32; SD = 10.69) were included in the study. The Barratt Impulsiveness Scale was used to evaluate impulsiveness and the Temperament Evaluation of Memphis, Pisa and San Diego Autoquestionnaire was used to evaluate affective temperamental traits. The participants were also screened for bipolar affective disorder spectrum using the Mood Disorder Questionnaire and the Hypomania Checklist-32.The Canadian Problem Gambling Index (CPGI) was used to evaluate the severity of pathologicalgambling in the assessed population. Polish versions of the questionnaires were filled out anonymously via the internet

Results:
Pathological gamblers (N =36) scored higher on ‛Motor impulsiveness’, ‛Cyclothymic’and ‛Irritability’subscales versus non-pathological gamblers (N =61) and non-gamblers (N = 42). Cyclothymic and motor impulsiveness significantly predicted CPGI scores. Motor impulsiveness was found to moderate the influence of cyclothymic affective temperamental traits on pathological gambling.

Conclusions:
Our data support prior reports of higher impulsivity traits and traits from the bipolar spectrum among pathological gamblers. The results indicate that the influence of affective temperamental traits on pathological gambling severity is moderated by impulsiveness.