منابع مشابه
Caesarean section among relatives.
BACKGROUND Caesarean section rates are increasing. It is not clear whether a familial predisposition to caesarean section exists. METHODS Births registered in the Medical Birth Registry of Norway during 1967-2005 were linked to construct 440,236 grandmother-parent units and 275,001 same sex full sibling units. Log-binomial regression models were used to explore associations. RESULTS A mothe...
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Evidence has suggested that risk for schizophrenia is likely to occur in non-psychotic first-degree relatives of patients with schizophrenia. On the other hand, schizotypal personality disorder is genetically related to schizophrenia. The aim of this study was to compare schizotypal traits (i.e., positive schizotypy, negative schizotypy, cognitive disorganization, and impulsive nonconformity) a...
متن کاملGames among relatives revisited.
We present a simple model for the evolution of social behavior in family-structured, finite sized populations. Interactions are represented as evolutionary games describing frequency-dependent selection. Individuals interact more frequently with siblings than with members of the general population, as quantified by an assortment parameter r, which can be interpreted as "relatedness". Other mode...
متن کاملDo humans prefer altruistic mates? Testing a link between sexual selection and altruism towards non-relatives.
Humans are often seen as unusual in displaying altruistic behaviour towards non-relatives. Here we outline and test a hypothesis that human altruistic traits evolved as a result of sexual selection. We develop a psychometric scale to measure mate preference towards altruistic traits (the MPAT scale). We then seek evidence of whether mate choice on the basis of altruistic traits is present and f...
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For decades, attempts to understand cooperation between non-kin have generated substantial theoretical and empirical interest in the evolutionary mechanisms of reciprocal altruism. There is growing evidence that the cognitive limitations of animals can hinder direct and indirect reciprocity because the necessary mental capacity is costly. Here, we show that cooperation can evolve by generalized...
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ژورنال
عنوان ژورنال: Behavioural Processes
سال: 2008
ISSN: 0376-6357
DOI: 10.1016/j.beproc.2008.06.002