An experiment is presented which investigated the relationship between rumination, dysphoria, and subjective experience during a short wordfragment completion task. Consistent with previous work off-task thinking, operationalized as task unrelated thought, was associated with dysphoria. By contrast, rumination was a significant predictor of task appraisal defined as task-related interference (TRI). While rumination did not directly contribute to the experience of task unrelated thinking (TUT), evidence was presented which suggests that when combined with a negative mood a ruminative style may amplify the association between this style of thinking and dysphoria. These findings suggest that we can distinguish between the phenomenological experience associated with rumination as distinct from dysphoria and this dissociation may be important in our ability to explain how self-focused attention contributes to enhanced psychological vulnerability. 355 Ó 2005, Baywood Publishing Co., Inc.have been associated with high levels of dysphoria [3,4]. More recently, thought sampling techniques have demonstrated that under laboratory conditions, dysphoria is associated with increased self-focused or off-task thinking [5][6][7]. These findings support the assertion that self-focus may function as a vulnerability factor for subsequent psychological problems [4] although little is known about the situational determinants (internal or external) that amplify the relationship [8].Rumination can be considered the process by which one "isolates one self to think about feelings, writing and telling others how bad one feels, worrying about the causes and consequences of depression" [9]. Rumination has been consistently related to an exacerbation of the psychological consequences of a dysphoric mood, for example, greater deficits in problem solving [10], increased recall of negative memories [11], and a higher level of negative thoughts [12]. In the research literature, there is a consensus that "rumination affects cognition through exacerbating the effects of a negative mood" [10]. One's tendency to ruminate may represent an internal factor which moderates the relationship between off task thinking and dysphoria.Under laboratory conditions the subjective experience of off task-thinking can be considered to consist of two distinct components [13]. First, it is possible to become pre-occupied with task performance. A good example of this is interfering thoughts regarding how one is performing on the current task. This aspect of cognition has been described as task related interference [TRI,[14][15][16][17]. Second, from time to time, one's attention can become directed to information which is neither in the current environment nor relevant to the current task. These cognitions can be conceptualized as task unrelated thinking [TUT,18,19] reflecting the fact that they are not derived from the context of the current task within which they are recorded. The distinction between TUT and TRI has proved important in studies of ongoing consciousnes...