Articles tagged with Intelligence Quotient
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Researchers at University of California, Berkeley found a significant association between prenatal organophosphate pesticide exposure and lower intelligence scores in children. The study, which followed 329 children from birth to age 7, suggests that fetal brain development may be more critical than childhood exposure.
A high-fat, high-sugar processed food diet in early childhood may lower IQ, while a healthy diet rich in vitamins and nutrients may boost intelligence. Research based on over 14,000 children found a strong association between dietary patterns in childhood and IQ at age 8.
Researchers at the University of Oregon found that a person's ability to store more items in their short-term memory is linked to higher fluid intelligence as measured by IQ tests. In contrast, the clarity or resolution of those memories shows no relationship with fluid intelligence.
Research from Michigan State University finds that late-preterm babies are between two and three times more likely to have lower IQs and higher levels of attention problems at age 6. The study controlled for maternal IQ and demographics, suggesting that factors other than genetics may contribute to the increased risk.
A study by researchers at the University of Washington found that 90% of high-functioning children with autism spectrum disorders showed discrepancies between their IQ score and performance on standardized tests. These children often have above-average academic abilities, suggesting that traditional IQ scores may not be an accurate pre...
A large study of Swedish men found a clear link between lower IQ scores and attempted suicide, with almost 18,000 hospital admissions recorded. The researchers suggest that low IQ may be linked to social disadvantage, poor health behaviors, and reduced resilience to stress, although the exact mechanisms are unclear.
A Tel Aviv University study found that young men who smoke cigarettes have lower IQs compared to non-smokers, with an average difference of seven points. The study tracked over 20,000 Israeli army recruits and found a strong correlation between cigarette smoking and lower cognitive function.
Children exposed to cocaine in the womb face negative effects, particularly on sustained attention and self-regulated behavior. However, research suggests that growth, IQ, academic achievement, and language functioning are less affected by prenatal cocaine exposure.
A large population study found that lower IQ scores were associated with higher rates of cardiovascular disease and total mortality, surpassing the risk linked to smoking. The study also identified other risk factors, including obesity, high blood pressure, and low physical activity.
A twin study found that face recognition is heritable and influenced by separate genes than general intelligence or IQ. The study's findings support a modularity hypothesis, suggesting specialized brain regions for specific cognitive skills like face recognition.
Researchers at Yale School of Medicine found that in typical readers, IQ and reading track together, but in children with dyslexia, they are not linked. Dyslexic individuals can be both bright and struggle with reading due to an uncoupling between cognitive ability and reading ability.
New research by University of New Hampshire professor Murray Straus reveals a strong link between spanking and lower IQs in children. The study found that children who were spanked had lower IQs four years later compared to those who were not spanked.
A new study by University of Liverpool researchers suggests that children born to mothers taking sodium valproate during pregnancy may have lower IQ scores. The research found a correlation between exposure to the medication and cognitive function in young children.
A recent study by the National Institute of Environmental Health Sciences found that children exposed to high levels of polycyclic aromatic hydrocarbons (PAHs) in urban areas had lower full-scale and verbal IQ scores compared to less exposed children. The effects were similar to those seen with low-level lead exposure.
A study published in Pediatrics found that prenatal exposure to polycyclic aromatic hydrocarbons (PAHs) can lower children's full-scale and verbal IQ scores. The study suggests that reducing air pollution exposure, particularly in urban areas, could have a positive impact on educationally meaningful IQ decreases.
A study found that a person's IQ explained over 20% of the difference in mortality between people from socio-economically disadvantaged backgrounds and those from more advantaged backgrounds. IQ was an additional factor to known risk factors like smoking and obesity.
Children resuscitated at birth show increased risk of low IQ at age 8, even in absence of encephalopathy. The study found a 65% increased risk in asymptomatic infants and a six-fold increased risk in those with symptoms.
A follow-up study published in the Journal of Autism Research found that 41 Utahns with autism had a higher social outcome than similar studies, with 24% having a very good social outcome. The study suggests that early intervention and strong social networks may play a role in determining social outcomes for individuals with autism.
Researchers created detailed brain maps using MRI and CT scans of 241 patients with cognitive impairment. The study found that verbal comprehension and working memory indices share overlapping brain regions, suggesting they may represent the same type of intelligence.
Camerer discusses his cognitive hierarchy theory, which suggests people only take a few steps of iterated thinking when strategizing. This theory has been tested using various game-theory experiments and field-data sets, showing that people typically choose lower numbers in games like the Swedish LUPI lottery.
A new study by Thomas P. Novak and Donna L. Hoffman found that consumers approach problems with either rational or experiential thinking styles. Rational thinking is characterized as logical, effortful, and analytical, while experiential thinking is associative, lower-effort, and holistic.
Researchers have developed a new system of scoring IQ tests for children with fragile X syndrome, a genetic disorder causing intellectual disabilities. The new method provides a more accurate assessment of the long-term learning potential of these children, helping parents and physicians diagnose and treat them more effectively.
Researchers found that siblings with mental illnesses are 63% more likely to experience depressive episodes, while those with low IQs are 18% more likely to live near their sibling but have lower emotional attachment. Environmental and social factors also play a role in poor mental health among these siblings.
A long-term study found that children with lower IQs were more likely to develop psychiatric disorders as adults, including schizophrenia, depression, and generalized anxiety disorder. Lower childhood IQ was also associated with persistent mental disorders and an increased risk of having two or more diagnoses.
A study published in Neurology found that children with lower IQs are more likely to develop vascular dementia later in life. The research compared the cognitive abilities of 173 people who developed dementia to those who did not, and found a significant link between low childhood IQ and an increased risk of vascular dementia.
A study published in Neurology found that children with multiple sclerosis exhibit low IQ scores and problems with memory, attention, and other thinking skills. The disease can also affect language development, with 30% of affected children experiencing language difficulties.
A new Cornell University study found that even small amounts of lead in children's blood are associated with reduced IQ scores. The study examined the effect of lead exposure on cognitive function in children with BLLs below the CDC standard, and found an adverse effect on nonverbal IQ scores.
A recent study published in Proceedings of the National Academy of Sciences reveals that breastfeeding enhances infant intelligence quotient (IQ) only if they have a specific genetic variant. This variant, found in the FADS2 gene, influences the metabolism of breast milk's long-chain polyunsaturated fatty acids, which are essential for...
A study of over 3,000 breastfed infants found that having the FADS2 gene variant increased intelligence by an average of nearly 7 IQ points. The researchers suggest that breastfeeding may account for these differences in intelligence due to the presence of certain fatty acids.
A study by McGill University found that physicians who score poorly on patient-physician communication skills exams are more likely to generate patient complaints. The exam's results prove its value in predicting patient complaints and could be used earlier in medical school admissions.
A 44-year-old man with a tiny brain and massive ventricular enlargement led a normal life despite mild leg weakness and cognitive impairments. He underwent various treatments, including shunt insertions and neuroendoscopic procedures, to manage his symptoms.
A team of UO researchers found that human memory has a four-item limit, varying from person to person, with high IQ individuals able to think about more things at once. The study contradicts the assumption that those who can remember more items have clearer memories.
A study of 187 two-year-old children found that those whose mothers took valproate during pregnancy had a higher risk of lower IQ. Children exposed to valproate showed an IQ in the mental retardation range at a rate of 24%, compared to 12% for carbamazepine and phenytoin, and 9% for lamotrigine.
A nationwide study by Ohio State University's Jay Zagorsky found that people with below-average intelligence are just as wealthy as those with higher IQ scores. However, high-IQ individuals tend to earn higher incomes but struggle with financial difficulties such as maxed-out credit cards and missed bill payments.
A study led by Danielle M. Dick found that variations in the CHRM2 gene can influence performance IQ scores, which measure visual-motor coordination, spatial perception, and abstract problem-solving skills. The researchers used DNA samples from over 2,150 individuals and found cumulative effects of good versus bad genetic variations.
A study found that children with higher intelligence at age 6 were less likely to develop post-traumatic stress disorder (PTSD) by age 17, even if they experienced traumatic events. Children with anxiety disorders and conduct problems at age 6 were more likely to develop PTSD.
A study published by the American Academy of Neurology found that childhood IQ and physical fitness are indicators of cognitive ability in old age. The research examined 460 participants who underwent cognitive tests at ages 11 and 79, revealing that physical fitness contributes more to cognitive function than childhood IQ.
Researchers found that the cognitive ability gap between blacks and whites has decreased significantly since 1972, with blacks making notable gains in cognitive tests. The study's findings suggest a possible correlation between social equality progress and IQ gains, potentially indicating further improvements.
A recent study found that low-to-moderate prenatal alcohol exposure is associated with lower IQ scores in 10-year-old African-American children, but not Caucasian children. The study suggests that mothers should abstain from drinking during pregnancy to prevent cognitive deficits.
A study found that light-to-moderate prenatal alcohol exposure is associated with lower IQs in offspring at 10 years of age. The effects were worse for African-American children, and a second trimester drinking pattern had the most significant impact on intellectual functioning.
Researchers found that children who experienced institutional deprivation showed an IQ deficit of about 15 points, even after reunification. The study suggests that early deprivation can lead to 'developmental programming' and that some children may experience continued progress into adolescence.
The study found that children with superior IQs have a cortex that thickens rapidly and peaks earlier than those with average or high IQs. The researchers suggest that this may be due to an extended critical period for development of high-level cognitive circuits.
A new study from Michigan Medicine reveals a direct relationship between smoking and neurocognitive function in men with alcoholism. Long-term smokers showed diminished thinking ability and lower IQ compared to non-smokers, even after adjusting for other factors.
Research found that children born full term but weighing less than 5.5 lbs had a 50% increased risk of psychological distress in later life, regardless of childhood factors. The study suggests that early factors before birth may be important in increasing vulnerability to depression in adult life.
A new study found that higher adolescent IQ and greater activity levels are associated with a lower risk of dementia and mild cognitive impairments. The research used historical data from high school records and interviews with graduates to explore the relationship between early-life factors and late-life cognitive status.
A bird IQ test, developed by Dr. Lefebvre, ranks species based on their innovative feeding behaviors observed in the wild. The study found that birds with greater behavioral flexibility and larger forebrains are more successful in new environments.
A new study found that faster reaction times were associated with longer life expectancy than higher IQ scores. The research built on earlier studies showing a link between lower IQs and early mortality. The study of middle-aged subjects suggested that processing information efficiency may be a key factor in predicting life span.
Research reveals substantial effects on IQ among children with prenatal alcohol exposure, particularly those born to older mothers or with a history of heavy drinking. The study identified subgroups of vulnerable children with compromised academic and social performance.
A study published in Psychological Science found that extra-curricular music lessons significantly improved IQ scores and academic performance in six-year-old children. The research, led by Dr. E. Glenn Schellenberg, showed that music lessons had a more pronounced effect on cognitive development than drama lessons or no lessons at all.
A comprehensive brain-scan study of intelligence has identified certain brain regions and their gray matter volume as key determinants of general human intelligence. The research reveals that multiple brain areas are related to IQ scores, with only about 6% of all gray matter appearing crucial for intelligence.
A recent study published in JAMA found that prenatal cocaine exposure was not associated with lower full-scale IQ scores, but did show specific effects on information, arithmetic, and object assembly. Children in foster or adoptive care showed improved cognitive outcomes despite higher levels of cocaine exposure.
The study found no correlation between prenatal cocaine exposure and lower IQ scores, but showed specific effects on subscales such as information, arithmetic, and object assembly. Children in foster or adoptive care had better IQs than those in biological maternal or relative care, despite increased severity of exposure.
Researchers found that SAT test scores are highly correlated with IQ scores, suggesting the SAT can be used as a reliable measure of intelligence. This correlation may have implications for understanding intellectual decline due to head injury or diseases like Alzheimer's.
A new study suggests that using IQ-adjusted norms can help identify high-functioning people at risk of developing pre-clinical Alzheimer's disease. By scoring against an individual's higher ability level, researchers found more accurate predictions than standard norms.
A recent study found that IQ tests taken at different times can result in vastly different diagnoses, with potential consequences for life or death sentences. The 'Flynn effect' causes IQ scores to rise over time, making it essential to reset the test every 15-20 years.
Researchers found that IQ test renorming influences which children are diagnosed with mental retardation regardless of cognitive ability. This can lead to students losing access to special services or being misclassified due to changing test norms.
Researchers found a 17% higher chance of death for every 15 points lower childhood IQ, but this difference was reduced to 12% after adjusting for socioeconomic factors. High-IQ individuals may have lived long lives due to improved health behaviors or better coping mechanisms.
A new study published in the New England Journal of Medicine found that even low levels of lead exposure can cause intellectual impairment in children. The researchers discovered that most of the damage to intellectual functioning occurs at blood lead concentrations below 10 micrograms per deciliter.
A study by Cornell University scientists found that children suffer intellectual impairment at blood-lead concentrations as low as 10 mcg/dl, even below the current CDC acceptable limit of 25 mcg/dl. The amount of impairment was most pronounced at lower levels, with a decline in IQ scores of up to 7 points.
A Canadian study found that heavy marijuana use is associated with decreased IQ scores, but light and former use are linked to modest gains. The research, which followed 70 subjects over several years, suggests that the effects of marijuana on intelligence may be more complex than previously thought.