October 19, 2011 |
IQ, or intelligence quotient, has been thought to be unchanging over the course of a lifetime. But researchers with the Wellcome Trust Centre for Neuroimaging at University College London have found that IQ can rise and fall in teenagers. Using magnetic resonance imaging (MRI) scans, they showed that ups and downs in verbal and nonverbal IQ correlated with changes in brain structure. The team's study was released Wednesday by the journal Nature. Professor Cathy Price and colleagues administered IQ tests and MRI scans to 33 healthy teens -- the first time in 2004, when the kids were 12 to 16 years old, and then a second time in 2007-08, when they were age 15 to 20. They found changes in individual subjects' performance on the tests, with verbal IQ, nonverbal IQ and composite IQ fluctuating up or down, in some cases around 20 points. In all, 39% of the sample had a change in verbal IQ, 21% in nonverbal IQ and 33% in composite IQ. Studying the MRI scans, the team discovered that changes in verbal IQ tracked changes in gray matter density and volume in a portion of the left motor cortex that is activated by speech. Changes in nonverbal IQ were correlated with gray matter density in the anterior cerebellum, which is associated with hand movement.
July 20, 2013 |
What does it mean to be gifted in the United States? A national survey in 2011 found that the predominant method of assessment, by far, is the administration of IQ tests and standardized academic tests. At least 34 states, including California, consider such tests an indication of giftedness; they are mandated by at least 16 states. In contrast, only nine states require the use of tests that measure "creativity" and even fewer require the assessment of leadership, motivation or a talent for the performing arts.
October 3, 2012 |
The children of mothers who have hypertension during pregnancy score lower on IQ tests 20 and 68 years after birth, according to a new study. The report, published Wednesday in the journal Neurology, is the first to draw a connection between high blood pressure during pregnancy and adult intelligence. Hypertension during pregnancy has been linked to premature birth and small body size, which in turn have been connected to deficits in cognitive abilities. But hypertension itself had yet to be connected directly to intelligence, a gap this study attempts to fill in. The research, conducted in Finland, used data collected as part of a survey called the Helsinki Birth Cohort.
April 21, 2011 |
Pesticides on fruits and vegetables may be harmful to a developing fetus — slightly. Children whose mothers were exposed to low doses of a specific class of pesticides may have a slightly lower IQ in later childhood, three new studies suggest. The new research found children had a slightly lower IQ by age 7 if their mothers, mostly low-income and mostly Latina and black, had higher-than-average exposure in pregnancy to organophosphates, pesticides farmers still sometimes spray on fruits and vegetables.
May 13, 2007
Re "Death row's IQ divide," Opinion, May 8 Sara Catania misapplies the concept of IQ. The people on death row are there not for a deficiency in intelligence but a deficiency in moral sense. People generally learn right from wrong at an early age, and virtually all know at least by age 7 that killing people or stealing is wrong. It is not at all apparent from Catania's writing why Jorge Junior Vidal, who "has a hard time understanding English or Spanish and struggles with routine tasks," should not be executed for torture and murder.
CALIFORNIA | LOCAL
May 28, 2013 |
A teenager charged with killing his girlfriend's mother and stepfather at their Compton mobile home has an "extremely low" IQ that is consistent with being mentally retarded, an expert testified Tuesday. Giovanni Gallardo, now 18, had an IQ of 57 when he was evaluated after the killings, placing him within the range of mild to moderate retardation, Dr. Deborah S. Miora, a clinical and forensic neuropsychologist, told the court. Prosecutors say Gallardo and his girlfriend killed the adults and later went to stores to purchase supplies for a Halloween party while one of the dead victims was in the back of the Jeep they were driving.