Cognitive abilities are important for the economic and non-economic success of individuals and societies. For international analyses, the collection of IQ-measures from Lynn and Vanhanen was supplemented and meliorated by data from international student assessment studies (IEA-Reading, TIMSS, PISA, PIRLS). The cognitive level of a nation is highly…

It has been established that both domain-specific (e.g. spatial) as well as domain-general (general intelligence) factors influence human cognition. However, the separation of these processes has rarely been attempted in studies using laboratory animals. Previously, we have found that the performances of outbred mice across a wide range of…

Based on the construct of classical IQ, a model of the proportions of the population at various stages of cognitive development as a function of age is proposed. The model compares well with other theoretical models and provides evidence of the salience of the construct of general cognitive capacity. (SLD)

Examination of data from the Infant Health and Development Program, a comprehensive program to avert health and intellectual impairments associated with premature low birthweight, does not show any enduring and meaningful effects on cognitive development resulting from the program. Discusses findings in terms of intelligence and its mutability.…

Change in cognitive functioning is an important aspect of human aging and a key outcome in many medical conditions. However, cognitive change can rarely be measured directly, since prior cognitive data do not exist for most people. We examined the criterion validity and one-year stability of the difference between National Adult Reading Test…