Search results for "ALTRUISM"

Memory-Based Mismatch Response to Frequency Changes in Rats

2011

Any occasional changes in the acoustic environment are of potential importance for survival. In humans, the preattentive detection of such changes generates the mismatch negativity (MMN) component of event-related brain potentials. MMN is elicited to rare changes (‘deviants’) in a series of otherwise regularly repeating stimuli (‘standards’). Deviant stimuli are detected on the basis of a neural comparison process between the input from the current stimulus and the sensory memory trace of the standard stimuli. It is, however, unclear to what extent animals show a similar comparison process in response to auditory changes. To resolve this issue, epidural potentials were recorded above the pr…

Oh sister, where art thou? Spatial population structure and the evolution of an altruistic defence trait.

2014

The evolution of parasite virulence and host defences is affected by population structure. This effect has been confirmed in studies focusing on large spatial scales, whereas the importance of local structure is not well understood. Slavemaking ants are social parasites that exploit workers of another species to rear their offspring. Enslaved workers of the host species Temnothorax longispinosus have been found to exhibit an effective post-enslavement defence behaviour: enslaved workers were observed killing a large proportion of the parasites’ offspring. As enslaved workers do not reproduce, they gain no direct fitness benefit from this ‘rebellion’ behaviour. However, there may be an indir…

No synergy needed: ecological constraints favor the evolution of eusociality.

2015

In eusocial species, some individuals sacrifice their own reproduction for the benefit of others. It has been argued that the evolution of sterile helpers in eusocial insects requires synergistic efficiency gains through cooperation that are uncommon in cooperatively breeding vertebrates and that this precludes a universal ecological explanation of social systems with alloparental care. In contrast, using a model that incorporates realistic ecological mechanisms of population regulation, we show here that constraints on independent breeding (through nest-site limitation and dispersal mortality) eliminate any need for synergistic efficiency gains: sterile helpers may evolve even if they are …

What drives brand love and purchase intentions toward the local food distribution system? A study of social media-based REKO (fair consumption) groups

2021

Local food is gaining increasing popularity among consumers due to its association with sustainable consumption. However, for a product to be commercially successful, such growing popularity should translate into high purchase intentions and positive associations with the product post-consumption. Although this success has not yet been reflected for local food consumption, research in this area has remained limited. The present study addresses this gap by examining the antecedents of brand love for both the local food distribution system and the local food it distributes. The study thus employs the stimuli-organism-response (SOR) theory, which indicates that certain environmental stimuli in…

Can goal setting and performance feedback enhance organizational citizenship behavior?

2008

Social evolution of innate immunity evasion in a virus

2019

Antiviral immunity has been studied extensively from the perspective of virus−cell interactions, yet the role of virus−virus interactions remains poorly addressed. Here, we demonstrate that viral escape from interferon (IFN)-based innate immunity is a social process in which IFN-stimulating viruses determine the fitness of neighbouring viruses. We propose a general and simple social evolution framework to analyse how natural selection acts on IFN shutdown and validate it in cell cultures and mice infected with vesicular stomatitis virus. Furthermore, we find that IFN shutdown is costly because it reduces short-term viral progeny production, thus fulfilling the definition of an altruistic tr…

The Determinants of Migrants’ Remittance Inflows in the MENA Region: A Macroeconomic Approach

2014

Macroeconomic studies on the determinants of remittance flows have traditionally reviewed the role that economic conditions of host and home countries of migrants play in this process. New contributions have enlarged that setting by dealing with socio-political (demographics, institutions) and individual (education) dimensions influencing migrants’ behaviour when they remit money back home. In this investigation, we test for the role of all these variables in a general framework when analysing the case of the MENA (Middle East and North of Africa) region. Results indicate that the state of the business cycle, the characteristics of households (fertility, income per capita), and those of the…

What should i do and who's to blame?

2022

The COVID-19 crisis has had a major impact on youth. This study examined factors associated with youth’s attitudes towards their government’s response to the pandemic and their blaming of individuals from certain risk groups, ethnic backgrounds, and countries or regions. In a sample of 5,682 young adults (Mage = 22) from 14 countries, lower perceived burden due to COVID-19, more collectivistic and less individualistic values, and more empathy were associated with more positive attitudes towards the government and less blaming of individuals of certain groups. Youth’s social identification with others in the pandemic mediated these associations in the same direction, apart from the COVID-19 …

Intention affects fairness processing : Evidence from behavior and representational similarity analysis of event‐related potential signals

2023

In an ultimatum game, the responder must decide between pursuing self-interest and insisting on fairness, and these choices are affected by the intentions of the proposer. However, the time course of this social decision-making process is unclear. Representational similarity analysis (RSA) is a useful technique for linking brain activity with rich behavioral data sets. In this study, electroencephalography (EEG) was used to measure the time course of neural responses to proposed allocation schemes with different intentions. Twenty-eight participants played an ultimatum game as responders. They had to choose between accepting and rejecting the fair or unfair money allocation schemes of propo…

Gestación subrogada: aspectos psicosociales

2016

ABSTRACT Innovation in assisted reproductive technologies together with increased infertility and new family structures are increasing the use of gestational surrogacy as a means to have children. Before, during and after the process, it is necessary to study the psychosocial characteristics of triad members: the gestational surrogate, intended parents, and offspring. Research has indicated positive adaptation to the process and benefits for all members of the triad. Altruism is the main motivation of surrogates. Notably, psychological well-being has been found to be higher in individuals who have become parents through surrogacy than in those who have used egg donation or have followed a n…