Altruistic behavior as a costly signal of general intelligence.

Unconditional altruism is an enduring puzzle for evolutionary approaches to social behavior. In this paper we argue that costly signaling theory, a well-established framework in biology and economics, may be useful to shed light on the individual differences in human unconditional altruism. Based on costly signaling theory, we propose and show that unconditional altruistic behavior is related to general intelligence. The cost incurred by engaging in unconditional altruism is lower for highly intelligent people than for less intelligent people because they may expect to regain the drained resources. As a result, unconditional altruism can serve as an honest signal of intelligence. Our findings imply that distinguishing altruistic behavior from cooperative behavior in social psychological and economic theories of human behavior might be useful, and that costly signaling theory may provide novel insights on various individual difference variables.Altruistic; Behavior; Costly signaling; Economic theory; Individual differences; General intelligence;

Second to fourth digit ratio and cooperative behavior.

A low second to fourth digit ratio (2D:4D) has been related to high testosterone levels and to markers of high status. In a social dilemma context status can be obtained either by acting egoistically (i.e. not contributing one's share) or by acting altruistically (i.e. contributing more than one's fair share). We therefore predicted that a low 2D:4D would be associated with high levels of egoism and altruism and low levels of common cooperativeness (i.e. contributing exactly one's fair share). We found the exact opposite: participants with a low 2D:4D were more likely to act cooperatively and less likely to act altruistically and egoistically. These findings suggest that (1) there might be a high and a low testosterone strategy to gain status and (2) that the high testosterone strategy is characterized by a preference for normative behavior.Altruism; Strategy; Preference; Behavior;

Digit extension: validation of a new biometric variable.

This paper reports on a new biometric variable, namely digit extension. We calculated the average length of the second and fourth digit rather than their ratio and we entitled this biometric digit extension. In a first study, we showed that digit extension is related more strongly to a self-concept associated with vigor (masculine trait) than with supportiveness (feminine trait) in men, but not in women. In a second study we found that digit extension and risk seeking (masculine trait) were related in men, but not in women. In a third study we found that for both men and women a higher digit extension was related to more altruistic behavior in a situation where it is in accordance with either masculine or feminine traits. For all studies we show divergent validity with digit ratio, indicating that digit extension is independent of digit ratio. We speculate about the hormonal influences that determine digit extension.Altruism; Behavior; Digit extension; Finger lengths; Masculinity; Risk; Risk seeking; Studies; Validation;

Stimulating referral behavior may backfire for men: The effect of referral failure on susceptibility to persuasion.

We present the referral-backfire effect, reflecting the phenomenon that consumers become less susceptible to persuasive attempts when they experienced referral failure. In two lab studies and one field study, we provide evidence for the effect and for the hypothesis that the effect occurs because referral failure is interpreted as a sign that the sender's social relations are threatened.Claim; Cognitive; Control; Control theory; Demand; Effects; Ego depletion; Implications; Model; Performance; Research; Self-control; Theory; Behavior; Studies; Field; Field study; Sign;

Unpredictable love? How uncertainty influences partner preferences

Do uncertain events (such as COVID-19) influence the types of partners that males and females feel attracted to in (online) dating? Four studies show that partner preferences are not fixed but dynamic and depend on people's temporary psychological state of uncertainty. Specifically, we show that when facing uncertainty, women are more attracted to men with tougher versus more tender facial features, whereas men are more attracted to women with more tender versus tougher facial features. This effect attenuates under certainty. We show furthermore that uncertainty (but not certainty) increases the preference of stereotypical partner types (caring vs. strong), which can be inferred from these facial features. These results are replicated with different facial stimuli and when uncertainty is activated due to COVID-19, pointing to the timeliness and generalizability of the findings. These findings have implications for our understanding of how and why partner preferences are influenced by uncertainty

Extremity in horizontal and vertical Likert scale format responses. Some evidence on how visual distance between response categories influences extreme responding

In four survey experiments we show that people generally answer more extremely to survey items presented in vertical versus horizontal Likert formats. Our findings suggest that this effect may be at least partly driven by differences in the visual range spanned by the response scale (i.e. the visual distance between endpoint response categories is larger in horizontal than in a vertical format). In addition, compared to traditional horizontal Likert data, vertical Likert data contain more variance, which is mainly non-substantive. As a result, data obtained with scale formats that have different distances between response categories (as is typically the case for vertical vs. horizontal formats) may lead to differences in measurement model parameter estimates like residual terms, and in some cases factor loadings and construct correlations. Based on these results, we provide recommendations on the use of response scale formats in online surveys, bearing in mind that several online survey tool providers promote the use of vertical Likert formats and even automatically change traditional horizontal formats of Likert-type items to vertical Likert formats when viewed on small screens (e.g., on mobile phones)

When organic products are tasty:Taste inferences from an Organic = Healthy Association

Previous research has consistently demonstrated that organic food is typically seen as healthier. The aim of the present study is to investigate how these health inferences influence taste perceptions of organic food. In Study 1, we show that a neutral food product with an organic label is perceived as more healthy than the same product without such a label. This higher level of perceived healthiness is paired with an improved perceived taste. In Study 2 and 3, we obtain evidence in Dutch and US samples that an organic label increases perceived taste and attractiveness of healthy (but not unhealthy) food. Whereas previous studies have shown general health halo effects of organic labels, this perspective cannot explain the specific pattern of our results, which speaks towards an ‘organic = healthy = tasty’ intuition

How do Customers Alter Their Basket Composition When They Perceive the Retail Store to Be Crowded? An Empirical Study

Using data from a large-scale field study, we show that (perceptions of) crowding change(s) the composition of a consumer's shopping basket. Specifically, as shoppers experience more crowding, their shopping basket contains (a) relatively more affect-rich (“hedonic”) products, and (b) relatively more national brands. We offer a plausible dual-process explanation for this phenomenon: Crowding induced distraction limits cognitive capacity, increasing the relative impact of affective responses in purchase decisions. As we are the first to show that level of crowding relates to what shoppers buy (at both product and brand level), the implications of these effects for retailers are discussed