Cattle discriminate between familiar and unfamiliar conspecifics by using only head visual cues

Faces have features characteristic of the identity, age and sex of an individual. In the context of social communication and social recognition in various animal species, facial information is relevant for discriminating between familiar and unfamiliar individuals. Here, we present two experiments aimed at testing the ability of cattle (Bos taurus) to visually discriminate between heads (including face views) of familiar and unfamiliar conspecifics represented as 2D images. In the first experiment, we observed the spontaneous behaviour of heifers when images of familiar and unfamiliar conspecifics were simultaneously presented. Our results show that heifers were more attracted towards the image of a familiar conspecific (i.e., it was chosen first, explored more, and given more attention) than towards the image of an unfamiliar one. In the second experiment, the ability to discriminate between images of familiar and unfamiliar conspecifics was tested using a food-rewarded instrumental conditioning procedure. Eight out of the nine heifers succeeded in discriminating between images of familiar and unfamiliar conspecifics and in generalizing on the first trial to a new pair of images of familiar and unfamiliar conspecifics, suggesting a categorization process of familiar versus unfamiliar conspecifics in cattle. Results of the first experiment and the observation of ear postures during the learning process, which was used as an index of the emotional state, provided information on picture processing in cattle and lead us to conclude that images of conspecifics were treated as representations of real individuals.     

Intertrial pellets influence the acquisition and expression of timed appetitive responding in rats

Two experiments examined temporally based changes in the conditioned magazine-entries of rats when a target food pellet arrived at a fixed time before the termination of a conditioned stimulus. Both experiments found that increasing the rate of intertrial pellets systematically interfered with the rate of acquisition. When intertrial pellets were featured in acquisition, their omission on test trials also resulted in a very poorly expressed conditioned response. On test trials preceded by intertrial pellets, however, peak times in groups trained with intertrial pellets were shifted in a rightward direction under a long but not short interstimulus interval. This rightward shift was accompanied by a smaller standard deviation. Our key findings are best accommodated by real-time associative models.     

Citoyenneté, nationalité et laïcité: Le débat sur la France multiculturelle depuis les années 80

Family reunification programs in the mid-1970s, the emergence of second generation immigrants in the early 1980s (rodéos des Minguettes in 1981, the march against racism in 1983) and the new position granted immigrants in French public and cultural life beyond economic and social frameworks, have provoked a series of reactions in public opinion. The realization that France is becoming a multicultural country aroused passions and stirred up concerns within French society as of the early 1980s. The debate moved logically towards a questioning of the very foundations of national identity and over ten years, structured itself around three republican values: citizenship, nationality, and secularity. The French felt threatened by the cumbersome presence of immigrants. From the 1960s to the 1980s, the evolution of the enfranchisement issue brought discussions of citizenship to the fore. The debate on the reform of the code on nationality between the mid-1980s and the mid-1990s highlighted the notion of nationality. Lastly, since 1989, the uncertainties and concerns surrounding the wearing of veils in schools have challenged the issue of secularity.     

The Proportion of Women Managers: Where Is the Critical Mass?1

This study examined the impact of proportions of women in management on attitudes of coworkers from two theoretical perspectives. According to Kanter (1977), women's competence, contribution to organizational culture, and status would be better appreciated as their proportion increased. According to Blalock (1967), men would react adversely. Data were collected from 453 managers in Canadian federal departments where the proportions varied from 9%, 20%, 35%, to 45%. Findings did not support either theory. Men made significantly more positive evaluations of women's participation in the organization and of their status in conditions above 20% than in the token condition. In the 45% sample, they recognized women's managerial talents significantly better. Women displayed confidence in their talents, irrespective of proportions. Results are discussed in the light of the influence of individual factors taken into account.     

L'évaluation subjective directe des émotions ressenties au sein du couple

This present study examined the relationship between interpersonal affects, personality, psychological distress, attachment and marital adjustment. More specifically, we hypothesized that the inclusion of a direct subjective evaluation of interpersonal affects would add to our understanding of marital adjustment, even when other variables (personality, psychological distress, attachment) are being taken into account. The sample included 204 heterosexual French Canadian married or cohabiting couples. Results showed that women experienced more feelings of insecurity, unfairness, depreciation and powerlessness than men. Also, individuals who were less satisfied with their marriage reported more feelings of insecurity, unfairness, depreciation and powerlessness.