Self-Continuity.

Self-continuity is the subjective sense of connection between one's past and present selves (past-present self-continuity), between one's present and future selves (present-future self-continuity), or among one's past, present, and future selves (global self-continuity). We consider the motivational character of the three forms of self-continuity, their regulatory properties, and the internal or external factors that consolidate them. We also review their consequences for attitudes and judgments or decisions, motivation, intentions and behavior, and psychological and physical health. We further detail the psychological and behavioral benefits of self-discontinuity (i.e., a sense of disconnect among temporal selves). We next turn to the brain regions that are activated synchronously with self-continuity. We consider developmental perspectives on self-continuity, discuss collective self-continuity (along with its consequences and regulatory properties), and elaborate on cultural differences in self-continuity. This inaugural Annual Reviews chapter demonstrates the breadth, excitement, and sense of synergy among self-continuity researchers and points to promising research directions.

Nostalgia strengthens global self-continuity through holistic thinking.

Nostalgia, a sentimental longing for one's meaningful past, promotes global self-continuity (GSC), a sense of connection among one's past, present, and future selves. We identified a cognitive mechanism for this effect: holistic thinking, and in particular interactional causality (presupposing multiple causes that interact to influence an object's behaviour). In three studies, using measurement-of-mediation and experimental-causal-chain designs, nostalgia was related to, and caused, higher GSC through interactional causality. In cross-sectional Study 1, trait nostalgia was associated with GSC via interactional causality. In Study 2, induced nostalgia led to higher interactional causality and ensuing GSC. In Study 3, manipulated interactional causal thinking increased GSC.

Implicit Theories of Happiness: When Happiness Is Viewed as Changeable, Happy People Are Perceived Much More Positively Than Unhappy People.

Happy people are often perceived positively, perhaps more than they actually are, whereas unhappy people are often perceived negatively, perhaps more than they actually are. What would make this bias stronger or weaker? The present research addresses this question by exploring the roles of implicit theories of happiness in the trait perceptions toward happy and unhappy people. Specifically, four studies (N = 998) tested hypotheses that an incremental theory of happiness would enhance and an entity theory of happiness would attenuate the trait perceptions favoring happy over unhappy people. Results found converging evidence that believing happiness as changeable (incremental theory) enhances the positive perceptions toward happy people, while providing less consistent evidence that believing happiness as fixed (entity theory) mitigates the negative perceptions toward unhappy people. The current research contributes to the literature on essentialism and advances the understanding of the roles of implicit theories of happiness in person perception.

How Does Nostalgia Conduce to Global Self-Continuity? The Roles of Identity Narrative, Associative Links, and Stability.

In five studies (N = 1,074), we examined the relation-both correlational and causal-between nostalgia, a sentimental longing for one's past, and global self-continuity (GSC), a sense of connection among past, present, and future selves. Furthermore, we addressed mechanisms underlying this relation. We asked, in particular, whether nostalgic individuals might achieve GSC by constructing a narrative to give meaning to life transitions (narrative), connecting to the past (associative links), or believing in a self that is resistant to change (stability). Nostalgia predicted (Studies 1-3) and caused (Studies 4 and 5) GSC. The relation between nostalgia and GSC was consistently mediated by narrative, sporadically mediated by associative links, and unmediated by stability. The robust indirect effect via narrative remained significant when controlling for rumination (Study 3). We discuss theoretical and practical implications.

Companion Versus Comparison: Examining Seeking Social Companionship or Social Comparison as Characteristics That Differentiate Happy and Unhappy People.

Which friend do you want to spend time with-a happy friend who performs better than you or an unhappy friend who performs worse than you? The present research demonstrates that in such conflicting situations, when the desires for companionship and comparison are pitted against each other, one's level of happiness plays an important role in one's choice. Using hypothetical scenarios, we found that compared with unhappy people, happy people expected that spending time with a happy, superior friend would be more pleasant than spending time with an unhappy, inferior friend (Studies 1B through 2) and were more willing to socialize with a happy, superior friend than with an unhappy, inferior friend (Studies 1B through 2). Moreover, this pattern was not explained by self-esteem (Study 2) or the similarity-attraction hypothesis (Study 3). The present findings suggest that happy people place more value on companionship than on comparison.