The primary purpose of this study was to examine the synchronous and temporal relations between engagement in activities and the two primary dimensions of affect, namely positive and negative affect, using an intensive time-series design called concomitant time series analysis (CTSA). Twentyfour dementia caregivers completed 56 diary measures (4 times per day for 2 weeks) assessing their experience of positive and negative affect as well as engagement in a variety of activities. Total number of activities was significantly correlated with positive affect (r = .40), but not negative affect (r = −.12). Obtained pleasure from activities was significantly correlated with both positive (r = .42) and negative affect (r = −.17). These results may help further develop behavioral models of depression by suggesting that behavioral or self-reinforcing activities are associated primarily (or more saliently) with one's experience of positive affect. Future research examining the effect of behavioral interventions on both positive and negative affect is suggested, as is the examination of factors that may be more strongly associated with negative affect.
KeywordsAffect; Depression; Activity; Time-Series; Dementia; Caregiving Those who provide care for a loved one with dementia are at increased risk for suffering both mental and physical health consequences (Schulz, O'Brien, Bookwala, & Fleissner, 1995). Perhaps the most notable consequence of caregiving is an increased risk for experiencing depressive symptoms. Indeed, compared to non-caregivers, caregivers are at approximately twice the risk for depression (Baumgarten et al., 1992), with studies placing caregivers' risk for depression between 28% and 33% (Cohen et al., 1990;Williamson & Schulz, 1993). Although research examining depressive symptoms among caregivers is quite common, little research has examined both positive and negative affect as individual constructs.Research over the past decades has established two basic, independent dimensions of affect termed positive and negative affect. Positive affect reflects one's level of excitement, interest, and enthusiasm, whereby negative affect reflects one's level of distress, fear, and relaxation (Watson, Wiese, Vaidya, & Tellegen, 1999). According to Watson, Clark, and Carey (1988)
NIH-PA Author ManuscriptNIH-PA Author Manuscript NIH-PA Author Manuscript depressive disorders result from a combination of low positive affect and high negative affect. This tripartite model of depression (Clark & Watson, 1991) further identifies high negative affect as a common factor underlying both depression and anxiety, whereas low positive affect is a primary distinguishing feature of depression as compared to other negative mood states (i.e., anxiety). This theory has been supported in multiple studies (Brown, Chorpita, & Barlow, 1998;Chorpita, Albano, & Barlow, 1998;Joiner, Catanzaro, & Laurent, 1996;Watson et al., 1995). For example, Watson and colleagues (1999) demonstrated that positive and negative affect each contributed ...