Department ofPsychology, Queen’s University, Kingston, CanadaAbstractCausal uncertainty (CU) refers to persistent doubts people have about their ability to understand causes of social events.Although such confusion about social dynamics should affect social exchanges, previous research has been limited to therealm of social cognition (i.e., computer-based studies exploring perceptions of hypothetical others). In three studies, weexplored CU effects during real-time social interactions with unacquainted conversational partners. We found that high CUparticipants perceived their conversations and conversational partners more negatively than did low CU participants and thatthese negative social perceptions stemmed from an inability to sufficiently reduce their cognitive uncertainty. Copyright © 2012John Wiley & Sons, Ltd.People often need to determine the reasons for people’sactions so they can respond appropriately. However, this pro-cess can be quite difficult because social events are complexand the specific causes for people’s behavior can be ambigu-ous and difficult to prove (Weary & Edwards, 1996). Inter-preting behavior during interactions with strangers, or initialinteractions,isfurthercomplicatedbythefactthatwepossesslittle information about our partners, increasing our uncer-tainty (Berger & Calabrese, 1975).Berger (1979) proposed that we experience cognitive uncer-tainty (i.e., uncertainty about others’ backgrounds, attitudes,and beliefs) and behavioral uncertainty (i.e., uncertainty abouthowtoactor reactinsocialsituations)during theseinteractions.In turn, this uncertainty produces cognitive and emotional dis-comfort (Heath & Bryant, 2000). Thus, according to Bergerand Calabrese (1975), a primary objective during initial interac-tions is uncertainty reduction. Specifically, we engage in twoforms of uncertainty reduction: proactive uncertaintyreduction,so wecan predict how our partner will behave in the future, andretroactive uncertainty reduction, so we can explain ourpartner’s behavior and select the appropriate response. Thisinformation is then incorporated into behavioral schemas thathelp people negotiate future interactions (Douglas, 1991).However, some individuals are unable to reduce theiruncertainty as effectively as others, making social interactionsmore difficult. For example, Douglas (1991) argued that peoplewith more global uncertainty (i.e., confusion about generalacquaintanceship processes) are unable to develop coherentschemas to guide their behavior and, therefore, experience lessuncertainty reduction as interactions progress. Consequently,they are more likely to avoid initial interactions altogether,resulting in greater loneliness.Similarly, some individuals experience persistent doubtsabout their ability to understand causes of social events; thesedoubts have been labeled causal uncertainty (CU; Weary EWeary&Jacobson,1997)andlesssatisfy-ing interactions (Boucher & Jacobson, 2005). Thus, CU maylead to problems with uncertainty reduction similar to thoseassociated with global uncertainty. Furthermore, CU is mod-erately and positively correlated with intolerance for and dis-comfort with ambiguity (Weary & Edwards, 1996), socausally uncertain people may find a lack of uncertaintyreduction especially frustrating, exacerbating their negativeperceptions of their conversations.Unfortunately, although causally uncertain people’s confu-sion about social dynamics should have the greatest impactduring social interactions (particularly initial interactions),virtually all CU research has been in the realm of social cogni-tion, and little attempt has been made to observe CU effectsduring real-time social interactions. In most previous research,participants made judgments about hypothetical targets at iso-lated computer terminals and merely had to process informa-tion that was given to them. Consequently, how CU affectsthe uncertainty reduction process or perceptions of interactionsand interaction partners remains unclear. We addressed thislimitation in the current research by exploring how CU affectsreal-time social exchanges between strangers.