We examined the sharing behaviour of children (aged 6-12) when presented with a generous vs. a selfish norm of sharing, or after having a choice of whether or not to request the (same) social-norm information. We found that with age children shared more overall and were more influenced by the generous norm in their recommendations to others. Moreover, the results show a significant effect of information-seeking on children's behaviour: children who were presented with the choice to request social-norm information and actively chose to request it were significantly more influenced by the information in their own sharing decisions and in their recommendation to others, compared with children who were presented with the same social-norm information without asking for it. The findings highlight the importance of an active search for information, rather than the information content per se, as a key factor in understanding the effect of social-norm information on children's sharing behaviour.

Equity crowdfunding is a method of financing an initiative whereby an entrepreneur sells shares in her firm to a group of people (the crowd) on a dedicated platform. Understanding the forces that shape the behavior of both buyers in the crowd and entrepreneurs in equity crowdfunding platforms can help design more efficient platforms and increase the welfare of all participants. We therefore develop a common value sequential crowdfunding game-theoretic model, where the entrepreneur sells a percentage of her firm in order to raise money for its establishment and then shares the future value of the firm with the crowd. Buyers on the platform who visit the campaign decide whether or not to invest in it. Each buyer’s decision depends on the amount that has already been invested before him and on his own knowledge about the firm and the market in which it operates (which we model as a noisy signal that he obtains regarding the true value of the firm). By offering a different percentage in the firm, the entrepreneur leads the crowd to a different equilibrium. We characterize these equilibria and then analyze the entrepreneur’s decision. We show that the entrepreneur’s optimal percentage she offers for sale is non monotonic in the ex-ante probability of success. This is in-line with recent empirical findings. We further show that when buyers’ signals are very noisy, the entrepreneur may prefer buyers that have a less accurate signal regarding the true value of the firm over buyers with a more accurate signal.

This paper explores the role of self-image concerns and a sense of entitlement in decisions involving resource allocation, when individuals can choose to seek or avoid information about the needs of others. We review research showing that people often engage in willful ignorance to protect their moral self-image while pursuing their self-interest. We propose, however, that to fully understand self-image protection as a driver of deliberate ignorance, it is essential to examine the underlying attitudes that support and sustain this motivation. As an example, we highlight the moderating role of entitlement, showing that individuals with a high sense of entitlement are less likely to avoid information and more likely to help. These findings underscore the interplay between moral self-concept and worldview in shaping social behavior.

Study Objectives

War profoundly impacts various aspects of human life. The effects of war on sleep have been mainly studied among military personnel who are directly exposed to combat. The present work studies changes in sleep patterns of the civilian population following a war, assessing sleep before and during the 2023-2024 Israel–Hamas war.

Methods

Study 1 compared the national prevalence of insomnia before and during the war by analyzing data from the 2023 Israeli Central Bureau of Statistics survey (N = 6,474). Studies 2 and 3 comprehensively assessed reports on sleep before the war and 2-3 months into the war through validated tools, and also measured psychological distress and demographics. These studies included two independent samples (N = 1,706), one of which was representative of the Israeli population. Study 4 re-surveyed the representative sample of Study 3 six months into the war (N = 273).

Results

In Study 1, the incidence of insomnia symptoms rose markedly during the war. In Studies 2 and 3, participants reported a 19-22 % increase in the prevalence of short sleep (< 6 hours/night), a 16-19 % increase in clinical insomnia, and a 4-5 % increase in sleep medication usage compared to before the war. In Study 4, 6 months into the war, the majority of sleep impairments persisted despite reduced psychological distress. Across studies, women and individuals with greater exposure to trauma were more strongly affected.

Conclusions

The findings of four studies demonstrate the detrimental effects of warfare on civilians’ sleep, indicating that these effects are likely long-lasting. The findings identify precursors for sleep problems and underscore the relationships between sleep, trauma, and psychological distress.

 

 

Values are central for life choices, including vocational and academic decisions. Importantly, vocational choices begin within the school system, where selecting specific study tracks can impact later career development. How do values relate to adolescents’ academic track choices? Study 1 focused on Israeli students who chose exact science tracks compared to those who chose other tracks. Adolescents, reached through panel recruitment (N = 216, age: M = 16.66, SD = 0.95; 63% female), reported their values and listed their academic tracks. Openness to change related positively to studying in exact science tracks. Study 2 used a different approach, with Israeli participants, recruited through social media (N = 125, age: M = 17.21, SD = 0.60; 52% female), self-reporting their main academic track and values. Additionally, a new questionnaire was introduced to measure the students’ value-based academic goals (VAGS). Exact science students held the highest self-enhancement academic goals, conservation values, and conservation academic goals. Artistic students had the highest openness values and the lowest conservation values and academic goals. Psychology students had the highest self-transcendence values and academic goals and lowest openness to change academic goals. Additionally, exact science students prioritized long-term goals more than those in other tracks. Similarities and differences in the two samples’ findings are discussed, in light of the different strategies to assign students to their study tracks. Results are reviewed in light of Schwartz’s values theory and Holland’s vocational environment model, promoting our understanding of the association between values and high school academic track choices. Theoretical and practical implications are suggested for the concepts of value-based academic goals.

A well-known observation in repeated-choice experiments is that a tendency to prefer one response over the others emerges if the feedback consistently favors that response. Choice bias, a tendency to prefer one response over the others, however, is not restricted to biased-feedback settings and is also observed when the feedback is unbiased. In fact, participant-specific choice bias, known as idiosyncratic choice bias (ICB), is common even in symmetrical experimental settings in which feedback is completely absent. Here we ask whether feedback-induced bias and ICB share a common mechanism. Specifically, we ask whether ICBs reflect idiosyncrasies in choice-feedback associations prior to the measurement of the ICB. To address this question, we compared the long-term dynamics of ICBs with feedback-induced biases in two longitudinal experiments involving 319 participants. We show that while feedback effectively induced choice preferences, its effect was transient and diminished within several weeks. By contrast, we show that ICBs remained stable for at least 22 months. These results indicate that different mechanisms underlie the idiosyncratic and feedback-induced biases.

This article proposes a new classification of legal remedies that cuts across existing classifications. It argues that all remedies involving the transfer of resources are positioned along a continuum from close to remote, which determines their “distance factor.” The basic distinction is between remedies provided directly by the injurer to the injured and remedies that are provided through third parties. The article presents the results of two original, preregistered experiments designed to examine the effect of the distance factor on perceptions of, and preferences for, various remedies from the perspectives of both the injured and injurers. The experiments reveal that even when the remedy is monetary, both injured and injurers prefer the remedy with the smaller distance factor. Specifically, both parties believe that direct compensation leads to better outcomes than payment via a third party with regard to rectifying the harm done, granting satisfaction to the injured, treating the injured and injurer with respect, improving the bilateral relations, and increasing the injurer's sense of responsibility for the harm. These findings are relevant to the various goals that the law wishes to promote, such as corrective justice, economic efficiency, or distributive justice. They vindicate the importance of private law, offer a more attractive justification for it than the one offered by Civil Recourse Theory, and support pluralism in remedial modes.

Effectively shaping human and animal behavior is of great practical and theoretical importance. Here we ask whether quantitative models of choice can be used to achieve this goal more effectively than qualitative psychological principles. We term this approach, which is motivated by the effectiveness of engineering in the natural sciences, ‘choice engineering’. To address this question, we launched an academic competition, in which teams of academic competitors used either quantitative models or qualitative principles to design reward schedules that would maximally bias the choices of experimental participants in a repeated, two-alternative task. We found that a choice engineering approach is the most successful method for shaping behavior in our task. This is a proof of concept that quantitative models are ripe to be used in order to engineer behavior. Finally, we show that choice engineering can be effectively used to compare models in the cognitive sciences, thus providing an alternative to the standard statistical methods of model comparison that are based on likelihood or explained variance.

This article discusses the Supreme Court case Tyler v. Hennepin County, which addressed the issue of home equity theft when local governments foreclose on properties for unpaid taxes and keep the surplus funds. The Court unanimously ruled that retaining surplus equity constitutes a taking under the Fifth Amendment, requiring just compensation to the homeowner. The decision strengthens property rights, particularly for lower-income individuals who are disproportionately affected by such practices. Analysis shows that the decision led to an increase in the sales prices of low-value homes in states that had previously engaged in home equity theft.

The article focuses on the Supreme Court's 2023 ruling on home equity theft, affirming that property rights extend beyond the wealthy. Topics include the legal arguments surrounding Geraldine Tyler's case against Hennepin County, the broader impact of similar laws in various states, and the economic effects of the ruling on low-value home prices.

Morphological study and molecular analysis reveal that the population of chthamalids from Seychelles Islands belongs to the species Tetrachthamalus obliterratus. Previously, this population was regarded as Chthamalus southwardi. Thus, our study leads to the conclusion that Chthamalus southwardi is a junior synonym of Tetrachthamalus oblitteratus and should be abandoned. The molecular comparison between the population of Seychelles and that of Elat (on the Red Sea), using three markers – COI, 12S rRNA, and NaKA – suggests that these populations present two distinct clades of Tetrachthamalus oblitteratus.

Although over 250 million people speak Arabic as their first language, only a minuscule fraction of developmental science studies Arab children. As values are a core component of culture, understanding how values develop is key to understanding development across cultures. Little is known about young Arab children’s values. We developed an Arabic version of the Picture-Based Value Survey for Children and implemented it in a multilingual application, adapted for 5-year-olds by recording the instructions and value item captions. We then compared the results in Arabic to those from the more established Hebrew version, with Hebrew-speaking children as a comparison group. A pilot study (N = 63) provided preliminary support that the measure is working well in Arabic and Hebrew. In Study 2, four hundred 5- to 12-year-old children reported their values (50% in Arabic, 50% in Hebrew) in a preregistered study. Multidimensional scaling analyses revealed structural patterns that closely correspond to Schwartz’s (1992) theoretical structure in both languages. Replicating past findings, power values were less important than benevolence in both cultural groups, and girls ranked self-enhancement values lower than boys (but not in Hebrew speakers). We further explored age and cultural differences in value development. Value consistency increased with age in both cultures, peaking at age 9–10. Cultural comparisons revealed several differences in value importance between the two cultures and lower value consistency and coherence in Arabic-speaking children. These results establish a tool for studying value development in Arab children and, more broadly, understanding the basic motivations driving populations that were hardly studied before. 

A number of estimators participate in a non-cooperative game where the data they collect are reported to a central planner who takes decisions. She in her turn decides on the estimates to be imposed on the participants. Because they are aware of this, they may behave strategically and misreport. We exemplify this decision making process where the James-Stein's estimator is used by the central planner. In particular, we consider the resulting optimization or Nash equilibria reporting strategies in a number of variations of this game.

• The article focuses on the Supreme Court's 2023 ruling on home equity theft, affirming that property rights extend beyond the wealthy. Topics include the legal arguments surrounding Geraldine Tyler's case against Hennepin County, the broader impact of similar laws in various states, and the economic effects of the ruling on low-value home prices.

More information today is becoming more accessible to more people at an ever-growing rate. How does epistemic curiosity operate in this expanding informational landscape? We test a novel theory which postulates that experienced curiosity is a function of two psychological factors: Interest, which is cognitive, “cool” and relatively stable in time, and Urge that is “hot” and quick to rise and decay. These factors determine one's experienced curiosity at any given point in time. Interestingly, these temporal dynamics may lead to time-dependent changes in epistemic choices. In a series of forced-choice experiments (n = 702), participants chose between receiving answers to either high-Urge or high-Interest questions. Consistent with predictions derived from our theory, we found a present-bias in preference for Urge. Our theory explains why, in stark contrast to individual interest and with the potential to derail public discourse, a competition for our attention inherently incentivizes the use of inciting and sensational information. We present and test a theory-based behavioral nudge that partially ameliorates these effects.

An especially critical task is to raise awareness of the effects of war on children, in general, and with reference to specific children whose circumstances might enhance their vulnerability. Starting points, from which we begin our discussion, are the abduction and separation of 3-year-old identical twins during the Hamas attacks on the South of Israel, on October 7, 2023. Emphasis is given to these twins’ circumstances and to all children’s heightened vulnerability to the detrimental effects of war-related trauma, including mental health issues such as anxiety, depression, and post-traumatic stress disorder. Specific attention is given to the profound bond between identical twins and the devastating consequences of separation on their immediate and long-term emotional well-being. Drawing on research findings surrounding children at war and on historical evidence for the effects of twin separation on individuals exposed to war, our commentary underscores the urgent need for awareness and condemnation of the direct targeting of children. We advocate the preservation of family ties as essential for fostering children’s resilience and emotional support. We also call upon professional organizations and the international community to prioritize the reunification of children with their families as a moral imperative in safeguarding the well-being and future of innocent children exposed to terrorism and conflict in war-torn regions.

In this Article, we offer a new design for our patent system with a view

to optimize its functioning. As multiple patent scholars have recognized, the

root cause of the ills of our patent system is the high rate of low-quality

patents. Extant patent law employs a binary screening process, under which

inventions either qualify for protection or fail. Thereafter, all qualifying

inventions are entitled to the same level of protection irrespective of the

degree of their novelty, utility and nonobviousness. As we establish

throughout this Article, patent law’s failure to distinguish among inventions

based on their quality greatly undermines the patent system’s principal

objective of optimally incentivizing and adequately rewarding innovative

progress. Society, at least in principle, ends up paying the same price for

all qualifying inventions, regardless of their level of innovation and

improvement upon the prior art.