Incest, inbreeding and mental abilities.

Differences in mental abilities.

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Decomposing the relationship between mental speed and mental abilities

Article history: Received 11 October 2013 Received in revised form 27 January 2015 Accepted 1 May 2015 Available online xxxx It is unclear whether different elementary cognitive tasks (ECTs) are associated with intelligence because these tasks tap the same basic cognitive process (suggesting a single mental speed factor) or different ones (suggesting several mental speed factors), as it is not ...

Measurement of learning and mental abilities.

Running head: DEVELOPMENT OF MENTAL TRANSFORMATION ABILITIES 1 Development of Mental Transformation Abilities

Mental representation and transformation of spatial information is often examined with mental rotation tasks, which require deciding whether a rotated image is the same or the mirror version of an upright image. Recent research with infants shows early discrimination of objects from mirror image versions. However, even at age 4, many children perform near chance level on more standard measures....

Effect of inbreeding on IQ and mental retardation.

Both decline of IQ and increase of mental retardation are consistent with rare recessive alleles at about 325 loci. There is no suggestion of a discrepancy that might be due to polygenic dominance or confounding of consanguinity with unfavorable environment. These data indicate that the risk for mental retardation in matings of normal parents increases from 0.012 with random mating to 0.062 for...