Persistent gambling was studied as a function of the reinforcement of arousal and winning during normal poker machine playing sessions. Play rate, heart rate, winnings, subjective excitement and expectations of winning were recorded for five male and five female high-frequency players. Autoregressive regression analysis indicated that wins affect play rate for up to three minutes, while effects of the other variables were inconsistent. Markov chain analysis confirmed that wins smaller than 50 credits tend to elevate play rate, while larger wins cause a breakdown in the otherwise very regular rate of play. Results are discussed in relation to the development of impaired control of gambling behaviour.

In view of the increasing popularity of minimal intervention treatments for problem drinking, a self-help manual for people who wish to reduce or stop gambling was prepared. Twenty-nine (ACT residents) who responded to advertisements for help with problem gambling were allocated to either of two minimal treatments, "Manual (only)" and "Manual & Interview". On average, clients from both groups reduced the frequency of their gambling sessions, frequency of overspending, and amount spent per week in the first three months and next three months after first contact, but expenditure per session increased from three to six months, after an initial improvement. There was no evidence that a single in-depth interview added to the effectiveness of the manual.

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Satisfactory models of the nature and treatment of excessive gambling must incorporate behavioural, cognitive, emotional and physiological findings. The acquisition of gambling behaviour is apparently influenced by social exposure and financial reinforcement. Continuation is promoted by partial reinforcement schedules and biased cognitions. Excessive gambling also involves changes in the individual's internal state, including physiological arousal, euphoria, distraction and perceived control. These effects might depend on the prior characteristics of the individual. Treatment should remove conditioned triggers, establish alternative means of financial and internal regulation, and reduce the individual's need for the financial and subjective rewards provided by gambling. Treatment goals and resources are discussed.

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