Male off-course bettors were assessed using: the Sensation-Seeking Scale (SSS) Form V, two measures of subjective arousal while betting, and questions concerning chasing, preferences for gambling activities and other aspects of betting behaviour. The SSS was also administered to a random sample of the male general population of Glasgow, together with questions concerning preferences for gambling activities to allow comparison between regular gamblers and the general population. In comparison with the general population and with non-gamblers, off-course bettors scored lower on SSS; gamblers preferring the casino and/or the race-track scored higher on SSS; gamblers betting on many different forms scored higher on SSS. A further analysis produced a cluster of variables among off-course bettors associated with impaired control of gambling, among which both SSS scores and chasing were prominent features.