Introduction & Theoretical Background
Drawing on early behavioral theories of depression (e.g., Lewinsohn, 1974), BA assumes that depressed individuals obtain less positive reinforcement because they engage in fewer pleasant activities and enjoy them less. Modern approaches to BA expand on these ideas by adopting a functional contextualistic perspective (Hayes et al., 1999): the aim is not simply to schedule pleasurable or satisfying events (as with the activity scheduling approach used in cognitive therapy; Beck et al., 1979), but to understand the variables that generate and maintain unhelpful responses, including overt behavior and cognitive processes (Veale, 2008). Furthermore, scheduled activities in BA extend beyond rewarding ones, and may include actions related to personal goals, values, unaddressed problems, and areas of avoidance (Kanter et al., 2010).
Several variants of BA have been developed over recent decades, all of which share a basis in activity monitoring and planning (Kanter et al., 2010). For instance, Lejuez and colleagues (2001,