Four- to 10-year-olds and adults (N = 205) responded to vignettes involving three individuals with different expectations (high, low, and no) for a future event. Participants judged characters' pre-outcome emotions, as well as predicted and explained their feelings following three events (positive, attenuated, and negative). Although adults rated high-expectation characters more negatively than low-expectation characters after all outcomes, children shared this intuition starting at 6-7 years for negative outcomes, 8-10 years for attenuated, and never for positive. Comparison to baseline (no expectation) indicated that understanding the costs of high expectations emerges first and remains more robust across age than recognition that low expectations carry benefits. Explanation analyses further clarified this developing awareness about the relation between thoughts and emotions over time.

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We measured judgments about emotions across time. In Study 1 (N ϭ 254) and Study 2 (N ϭ 162),LGBTQ-Latinx, straight-Latinx, LGBTQ-White, and straight-White emerging adults rated how they would feel if a perpetrator acted positively (P) or negatively (N) toward them in single, isolated events. In Study 2, participants also responded to a new emotions across time task where they judged how they would feel interacting with a hypothetical perpetrator across three timepoints: (1) an initial past event, (2) a recent past event, and (3) an uncertain future-oriented event (e.g., seeing the perpetrator again). Participants further predicted their thoughts and decisions in the uncertain future-oriented event. The past emotional events appeared in various sequences (PP, NN, NP, PN). Results indicated that participants judged events as emotionally unambiguous when occurring first in a sequence or in isolation (positive events feel better than negative events). In contrast, initial events shaped emotional reactions to subsequent events: Participants responded more intensely to episodes that were preceded by events of the same valence. In addition to this augmenting effect, initial negative events were especially sticky: Participants rated a positive event following a negative event as feeling less good than when a positive event appeared first or in isolation, but they judged negative events to feel equivalently bad regardless of order. When evaluating future-oriented affective states, participants drew from the prior experiences and prioritized the recent past (more positive emotions, thoughts, and decisions for PP Ͼ NP Ͼ PN Ͼ NN). Effects replicated across all social groups.

We examined the influence of prior expectations on 4-to 10-year-olds' and adults' preferences and emotions following an undesirable outcome (N = 205; 49% female, 51% male; 6% Asian, 1% Black, 13% Hispanic/Latino [non-White], 57% White, 18% multiracial, and 5% another race/ethnicity; 75% with a college-educated parent). Participants attempted to win a chance game with multiple prizes; the worst prize being a pencil. The game was rigged so that half of the participants lost, and the other half won. Regardless of the game outcome, everyone received a pencil. For winning participants (high-expectation condition), the pencil was worse than the prize they expected; whereas for losing participants (low-expectation condition), the pencil was better than the "nothing" they expected. Participants rated how much they liked and felt about the pencil preoutcome, postoutcome, when imagining having held an alternative prior expectation, and after learning that everyone received a pencil. Results showed that 6-to 10-year-olds and adults with low (vs. high) expectations liked the pencil more, with emotion ratings trending in the same direction. Prior expectations did not influence younger children's affective experiences. More participants with low (vs. high) expectations also expressed a positive outlook about the pencil, which increased with age and correlated with higher postoutcome emotions. More adults than children explained emotions as caused by thoughts, and only adults consistently reasoned that their preferences and emotions would have differed had they held alternative prior expectations. Once knowing that everyone received a pencil, 6-to 10-year-olds and adults liked the pencil more and felt better.