The principal aims of the study were to define different profiles of cohesion and perceived efficacy in soccer players and to measure their differences in performance. The subjects were 235 soccer players in the under-18 category who played in the National League in Spain and 15 coaches whose ages ranged from 29 to 45 years. Diverse instruments to assess cohesion, perceived efficacy, and expect...

During collective movement, animals display a wide variety of mechanisms to maintain cohesion. In some species, individuals rely mainly on following their direct predecessor, thereby forming spectacular processions of individuals in single file. Despite being the simplest case of following behaviour, it is largely absent from the theoretical literature on collective migrations. The objective of...

DOCUMENT RESUME CG 010 889 Shipley, Robert H. Effect of a Collective Project on Group Cohesion. [74] 18p.; Paper presented at the Annual Convention of the American Psychological Association (83rd, Chicago, Illinois, August 30 to September 2, 1975) Robert H. Shipley, Mid-Missouri Mental Health Center, Columbia, Missouri 65201 MF-$0.83 HC-$1.67 Plus Postage. *Creative Art; *Group Dynamics; *Group...

Web 2.0 sociable technologies (such as social network sites, SNS) create new online interpersonal collaboration and communication. Particularly, given the proliferation of virtual community page (VCP, ex. Facebook fan page and group) participation, the sustainability of VCP has been recognized as a critical issue. While existing studies have started to address this issue through classical indiv...

We study the onset of collective motion, with and without cohesion, of groups of noisy self-propelled particles interacting locally. We find that this phase transition, in two space dimensions, is always discontinuous, including for the minimal model of Vicsek et al. [Phys. Rev. Lett. 75, 1226 (1995)]] for which a nontrivial critical point was previously advocated. We also show that cohesion is...

The ability of animals to adjust their behaviour according to seasonal changes in their ecology is crucial for their fitness. Eusocial insects display strong collective behavioural seasonality, yet the mechanisms underlying such changes are poorly understood. We show that nest preference by emigrating Temnothorax albipennis ant colonies is influenced by a season-specific modulatory pheromone th...

In gregarious species, social interactions maintain group cohesion and the associated adaptive values of group living. The understanding of mechanisms leading to group cohesion is essential for understanding the collective dynamics of groups and the spatio-temporal distribution of organisms in environment. In this view, social aggregation in terrestrial isopods represents an interesting model d...