What children know about the source of their knowledge without reporting it as the source

We argue that, amongst 3- to 5- year-olds, failure to report the source of knowledge recently acquired in answer to “How do you know…?” is due to a specific failure to make a causal inference, in line with source monitoring theory but not fuzzy trace theory. In three Experiments, children (N = 37; 30; 59) identified a hidden toy by seeing, feeling, or by being told, having had two modes of access on each trial, one informative (e.g. seeing a toy identified by colour) and the other uninformative (e.g. being told the toy’s colour by the Experimenter who had only felt it). Children who answered the know question wrongly nevertheless reported accurately who saw and who felt the toy, and what the well-informed player had said. They also realised when the Experimenter’s uninformative access implied their own knowledge was unreliable, suggesting precocious working understanding of knowledge sources

Environmental Factors Influencing Epidemic Cholera

Cholera outbreak following the earthquake of 2010 in Haiti has reaffirmed that the disease is a major public health threat. Vibrio cholerae is autochthonous to aquatic environment, hence, it cannot be eradicated but hydroclimatology-based prediction and prevention is an achievable goal. Using data from the 1800s, we describe uniqueness in seasonality and mechanism of occurrence of cholera in the epidemic regions of Asia and Latin America. Epidemic regions are located near regional rivers and are characterized by sporadic outbreaks, which are likely to be initiated during episodes of prevailing warm air temperature with low river flows, creating favorable environmental conditions for growth of cholera bacteria. Heavy rainfall, through inundation or breakdown of sanitary infrastructure, accelerates interaction between contaminated water and human activities, resulting in an epidemic. This causal mechanism is markedly different from endemic cholera where tidal intrusion of seawater carrying bacteria from estuary to inland regions, results in outbreaks

Chutes de grêle, inondations et autres calamités : l'administration britannique en Inde du Nord (1860-1949)

Whitcombe Elizabeth. Chutes de grêle, inondations et autres calamités : l'administration britannique en Inde du Nord (1860-1949). In: Annales. Économies, Sociétés, Civilisations. 29ᵉ année, N. 3, 1974. pp. 619-639

Children’s selective learning from others

Psychological research into children’s sensitivity to testimony has primarily focused on their ability to judge the likely reliability of speakers. However, verbal testimony is only one means by which children learn from others. We review recent research exploring children’s early social referencing and imitation, as well as their sensitivity to speakers’ knowledge, beliefs, and biases, to argue that children treat information and informants with reasonable scepticism. As children’s understanding of mental states develops, they become ever more able to critically evaluate whether to believe new information