We show that homogeneous Einstein metrics on Euclidean spaces are solvmanifolds, using they admit periodic, integrally minimal foliations by hypersurfaces. For the geometric flow induced orbit-Einstein condition, we construct a Lyapunov function based curvature estimates which come from real GIT.

The assessment of hearing impaired children is fraught with a number of problems. These include lack of valid assessment measures, faulty theoretical assumptions, lack of knowledge regarding the functioning of cognitive processes of these children, and biases against these children. This article briefly considers these issues and describes a study conducted with hearing impaired children. To ex...

Response times may constitute an important additional source of information about cognitive ability as it enables to distinguishing between different intraindividual response processes. In this paper, we present a method to disentangle interindividual variation from intraindividual variation in the responses and response times of 978 subjects to the 14 items of the Hungarian WISC-IV Block Desig...

The Wechsler Intelligence Scale for Children—Revised (WISC-R) and Standard Raven Progressive Matrices (SPM) Test were evaluated in the context of an intervention/program evaluation study and in terms of a proportionate representation model of test bias. A total of 26,300 boys and girls from 8 different ethnic backgrounds were evaluated over a 9-year period. An intervention based on monitoring o...

It is often asserted that Black Americans have made no IQ gains on White Americans. Until recently, there have been no adequate data to measure trends in Black IQ. We analyzed data from nine standardization samples for four major tests of cognitive ability. These data suggest that Blacks gained 4 to 7 IQ points on non-Hispanic Whites between 1972 and 2002. Gains have been fairly uniform across ...

Although it is widely acknowledged that chess is the best example of an intellectual activity among games, evidence showing the association between any kind of intellectual ability and chess skill has been remarkably sparse. One of the reasons is that most of the studies investigated only one factor (e.g., intelligence), neglecting other factors relevant for the acquisition of chess skill (e.g....