Cultural intelligence is key to explaining human tool use

Contrary to Vaesen, we argue that a small number of key traits are sufficient to explain modern human tool use. Here we outline and defend the cultural intelligence (CI) hypothesis. In doing so, we critically re-examine the role of social transmission in explaining human tool use.     

Childhood and advances in human tool use

Human life history incorporates childhood, a lengthy post-weaning period of dependency. This species-specific period provides an opportunity for extensive learning and for sophisticated cultural behaviors to develop, including crucial tool use skills. Although I agree that no individual cognitive trait singularly differentiates humans from other animals, I suggest here that without childhood, the traits that are key to human tool use would not emerge.     

Occupational sex stereotypes among college students

Occupational stereotypes among college students are examined. College students rated the 106 occupations contained in the Strong Interest Inventory according to the degree persons in these occupations contained masculine or feminine traits or according to the proportion of men and women employed in them. Men and women made equivalent ratings of occupations. Ratings for trait and proportion did not differ. Based on comparisons with Shinar's earlier research in 1975, it would appear that stereotyping has moderated even though it remained present in responses. Further comparisons show consistent differences in stereotyping based on the Holland occupational types of occupations rated. Implications for the use of interest inventories and the continuation of sex typing are presented.     

Big Five personality dimensions in Italian and Dutch adolescents: A cross-cultural comparison of mean-levels, sex differences, and associations with internalizing symptoms

In the present cross-national comparison, self-reported Big Five personality data on large samples of Dutch (N = 1521) and Italian (N = 1975) adolescents were employed. Results suggest that the personality of Dutch and Italian adolescents can be described by the same Big Five traits, but that these might have slightly different meanings to the Dutch and Italian adolescent respondents. Supplementary analyses uncovered that sex differences are largest among Italian adolescents. Further comparisons reveal subtle cross-national differences in personality-psychopathology relationships, with stronger associations of Emotional Stability with depression for Italian when compared to Dutch adolescents. Results underscore that cross-national comparisons of personality may be alluring to use in research, however the findings of these comparisons should be interpreted with caution.     

What exists in the environment that motivates the emergence, transmission, and sophistication of tool use?

In his attempt to find cognitive traits that set humans apart from nonhuman primates with respect to tool use, Vaesen overlooks the primacy of the environment toward the use of which behavior evolves. The occurrence of a particular behavior is a result of how that behavior has evolved in a complex and changing environment selected by a unique population.     

So, are we the massively lucky species?

We are in vehement agreement with most of Vaesen's key claims. But Vaesen fails to consider or rebut the possibility that there are deep causal dependencies among the various cognitive traits he identifies as uniquely human. We argue that "higher-order relational reasoning" is one such linchpin trait in the evolution of human tool use, social intelligence, language, and culture.     

Development and Validation of a New Body-Image Assessment Scale

This investigation reports the development and validation of a new and improved body-image assessment tool, the Contour Drawing Rating Scale, consisting of nine male and nine female contour drawings. The drawings were designed with detailed features, are of precisely graduated sizes, and are easily split at the waist for accurate upper and lower body comparisons. Initial evidence of the scale's reliability and validity supports its use as a measure of body-size perception.     

Cultural threat and perceived realistic group conflict as dual predictors of prejudice

Recent research has focused on how perceived intergroup similarity influences stereotyping and prejudice. Very little is known, however, regarding how the quality or type of similarity influences intergroup relations. Presented is a methodology that allows one to manipulate the quality of perceived intergroup similarity. This methodology is used to test contrasting predictions about how perceptions of intergroup similarity on self-stereotyped interpersonal and work-related traits predict attitudes towards immigrants. Predictions were derived from cultural threat and perceived realistic group conflict theories. Some participants were asked to rate how similar they perceived their in-group was to Mexican immigrants, whereas others were asked to evaluate how the groups differed on the given traits. Control participants evaluated themselves on the given traits. Participants were presented with either interpersonal traits or work related traits as stimuli. The main dependent measures were a perceived realistic conflict scale, a prejudice scale, and a stereotyping scale. All three scales used Mexican immigrants as the target category. When interpersonal traits were made salient, contrast comparisons led to more negative attitudes towards immigrants, supporting a cultural threat hypothesis. When work-related traits were made salient, similarity comparisons led to more prejudice and more negative attitudes towards immigrants, supporting a perceived realistic conflict hypothesis. Thus, a perceived threat to either the cultural norm or economic well being led to more negative attitudes towards immigrants. Results are discussed for their relevance to models of intergroup relations.     

The cognitive bases of human tool use

This article has two goals. The first is to assess, in the face of accruing reports on the ingenuity of great ape tool use, whether and in what sense human tool use still evidences unique, higher cognitive ability. To that effect, I offer a systematic comparison between humans and nonhuman primates with respect to nine cognitive capacities deemed crucial to tool use: enhanced hand-eye coordination, body schema plasticity, causal reasoning, function representation, executive control, social learning, teaching, social intelligence, and language. Since striking differences between humans and great apes stand firm in eight out of nine of these domains, I conclude that human tool use still marks a major cognitive discontinuity between us and our closest relatives. As a second goal of the paper, I address the evolution of human technologies. In particular, I show how the cognitive traits reviewed help to explain why technological accumulation evolved so markedly in humans, and so modestly in apes.     

Self-esteem, construal, and comparisons with the self, friends, and peers

Extending the better than average effect, 3 studies examined self-, friend, and peer comparisons of personal attributes. Participants rated themselves as better off than friends, who they rated as superior to generalized peers. The exception was in direct comparisons, where the self and friends were not strongly differentiated on unambiguous negative attributes. Self-esteem and construal played moderating roles, with persons with high self-esteem (HSEs) exploiting both ambiguous positive and ambiguous negative traits to favor themselves. Persons lower in self-esteem exploited ambiguous positive traits in their favor but did not exploit ambiguous negative traits. Across self-esteem level, ratings of friends versus peers were exaggerated when attributes were ambiguous. HSEs seemed to take advantage of ambiguity more consistently to present favorable self-views; people with low self-esteem used ambiguity to favor their friends but were reluctant to minimize their own faults.     

Personality Psychology: Research Trends for 1993–1995

Articles published in five prominent personality journals for the three-year period 1993–1995 were reviewed in order to identify recent trends in personality research. Each article was assessed in terms of research methodology and content area. Research methodology has changed very little, the exceptions being a shift away from laboratory settings and a greater use of nonuniversity participants. Results for content demonstrate that over time certain topics emerge and fade from popularity. Current popular topics include traits, emotion/motivation, and health psychology. The general lack of advancement in methodology is discussed, and the current "hot topics" in content area are compared with those of the past. In addition, some comparisons are made between current personality research in North America versus research in Europe.     

Human tool behavior is species-specific and remains unique

Human tool behavior is species-specific. It remains a diagnostic feature of humans, even when comparisons are made with closely related non-human primates. The archaeological record demonstrates both the deep antiquity of human tool behavior and its fundamental role in distinguishing human behavior from that of non-human primates.     

Pubertal timing and substance use: associations between and within families across late adolescence

In the present study, between-family analyses of data from adolescent twin girls offer new evidence that early menarche is associated with earlier initiation and greater frequency of smoking and drinking. The role of personality factors and peer relationships in that association was investigated, and little support was found for their involvement. Novel within-family analyses replicating associations of substance use with pubertal timing in contrasts of twin sisters selected for extreme discordance for age at menarche are reported. Within-family replications demonstrated that the association of pubertal timing with substance use cannot be explained solely by between-family confounds. Within-family analyses demonstrated contextual modulation of the influence of pubertal timing: Its impact on drinking frequency is apparent only among girls in urban settings. Sibling comparisons illustrate a promising analytic tool for studying diverse developmental outcomes.     

Studying expertise in music reading: Use of a pattern-matching paradigm

Two experiments are described that make use of a pattern-matching paradigm to investigate perceptual processing of music notation. In Experiment 1, it is reported that the speed of comparing two visually presented musical sequences is related to the sight-reading skill of the subjects. The effect of the temporal and pitch structure of the comparison stimuli is also assessed. In Experiment 2, eyemovement recordings were taken as subjects performed the task. These data demonstrated that more experienced musicians are able to perform the comparisons with fewer, and shorter, glances between the patterns. These and other findings suggest that skilled sight-reading is associated with an ability to rapidly perceive notes or groups of notes in the score, and confirm that the pattern-matching paradigm is a useful tool in examining expertise in music reading.     

From individual cognition to populational culture

In my response to the commentaries from a collection of esteemed researchers, I reassess and eventually find largely intact my claim that human tool use evidences higher social and non-social cognitive ability. Nonetheless, I concede that my examination of individual-level cognitive traits does not offer a full explanation of cumulative culture yet. For that, one needs to incorporate them into population-dynamic models of cultural evolution. I briefly describe my current and future work on this.     

Whose personality is better,mine or my partner's? Self‐enhancement bias in relationships

Previous research has documented self‐enhancement and relationship partner‐enhancement motivations, but not examined whether individuals view themselves or their partners more favorably, overall. The authors conducted three studies that revealed a general tendency to favor oneself over one's partner in direct self–partner personality comparisons. This illustrated a motivational precedence of self‐enhancement over partner‐enhancement goals. In Study 1, participants rated self‐only traits more favorably than partner‐only traits. In Studies 2 and 3, participants rated desirable traits as more characteristic of themselves than their partner, particularly when traits were more relevant to personal than relationship success. The authors also found that this self‐favoring bias was weaker (typically nonexistent) among those with higher relationship satisfaction, lower self‐esteem, or lower self‐deceptive tendencies. The authors discuss practical, theoretical, and methodological implications.     

Valence, comparison focus and self-positivity biases: does it matter whether people judge positive or negative traits?

The present research questions whether mere valence affects self-other comparisons in the domain of trait characteristics. While some previous studies have reported greater positivity bias for the self when traits were positive than when traits were negative, we suggest that this is an ambiguous finding, because valence and content were confounded. When we unconfounded content and valence, valence had no effect on the magnitude of self-positivity bias displayed. We also replicate several findings for our unconfounded set of traits. Firstly, comparing others to the self, rather than comparing the self to others, lowered self-positivity for positive and negative traits (focus effect). Secondly, extremely positive and negative traits triggered greater positivity bias than did more moderately evaluated ones. Finally, we suggest that comparative self-positivity biases may be based on a general positivity bias.     

Experiential structuring of psychological traits

The major object of this article is to examine the part that the organization of our experiences may play in the structuring of our psychological traits. How does an individual's learning history influence the formation of his or her psychological traits? This question is approached by considering the traits identified in diverse contexts that provide substantially different experiential histories for the developing individual. Examples of such contexts are taken from research on (1) affective and cognitive domains, (2) academic and practical intelligence, (3) trait development in different species, (4) trait structure across the life span, and (5) cross-cultural trait comparisons. Special attention is given to the role of formal schooling in the formation of cognitive traits and to the contribution of such technological developments as phonetic writing, counting and numerical systems, and Computers.     

More human than you: attributing humanness to self and others

People typically evaluate their in-groups more favorably than out-groups and themselves more favorably than others. Research on infrahumanization also suggests a preferential attribution of the "human essence" to in-groups, independent of in-group favoritism. The authors propose a corresponding phenomenon in interpersonal comparisons: People attribute greater humanness to themselves than to others, independent of self-enhancement. Study 1 and a pilot study demonstrated 2 distinct understandings of humanness--traits representing human nature and those that are uniquely human--and showed that only the former traits are understood as inhering essences. In Study 2, participants rated themselves higher than their peers on human nature traits but not on uniquely human traits, independent of self-enhancement. Study 3 replicated this "self-humanization" effect and indicated that it is partially mediated by attribution of greater depth to self versus others. Study 4 replicated the effect experimentally. Thus, people perceive themselves to be more essentially human than others.