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Alternative TitleIntellectual ability and cortical development in children and adolescents
Thesis Advisor左西年
Degree Grantor中国科学院心理研究所
Place of Conferral中国科学院心理研究所
Degree Name理学博士
Degree Discipline认知神经科学
Keyword智力 皮层发育 儿童青少年 彩巢计划 生长曲线




Other Abstract

Childhood and adolescence are periods in which individuals develop rapidly, including both rapid physical development (such as height and weight) and rapid psychological changes (such as cognition and emotions). Reveling the relationship between brain tissue development and the rapid development of various cognitive abilities during this period is of great scientific significance for understanding brain mechanisms and development laws. Studies of intelligence-related brain mechanisms have found that the relationship between intelligence and brain indicators showed individual differences in different age groups. Longitudinal studies have found that intelligence is related to the development of cortical thickness and cortical area. However, there are few studies on this dynamic association between intelligence and brain development. In this paper, the relationship between the development and intelligence of cortical morphology and functional metrics in childhood and adolescence was analyzed by using the "Chinese Color Nest Project: Growing Up in China" 178 participants aged 6一17 years and total of 378 scans for 3 time points. The generalized additive-mixed model was used to systematically analysis the development of intelligence components (subtests' raw scores), the development of cortical metrics, and the relationship between intelligence and cortical development.

The results showed that: 1)the raw scores of the four intelligence dimensions showed a nonlinear upward trend, the development curves resembled within the four dimensions, and the growth rate was faster in primary school stage; high order cognitive abilities exhibit faster increase rate, while primary abilities show a relative flat trend. 2) Cortical thickness declined with age increase, cingulate gyrus, precuneus and lateral temporal lobe had greater thinning rates. 3) Boys had greater cortical area than girls, and the developmental trajectory of cortical surface area manifested significant gender differences. Girls have a downward or inverted U-shaped trajectory, and begin to decline steadily earlier than boys, and boys show volatility on the development curve, steadily decline around 14 years old. 4) Surface-based regional homogeneity showed significantly decrease with age, high-order functional networks demonstrate greater decline rate; and the developmental trajectories with two neighbor types are similar, while the surface-based regional homogeneity of first-order neighbors can detect more gender differences, and the mean local functional homogeneity of girls is higher than that of boys. High order functional networks exhibit high plasticity in both brain structure and functional activity, and this may due to the interaction between cortical development and cognitive development. 5) The association between intelligence and cortical surface area is dynamic during childhood and adolescence, and children in the superiorhigh IQ group show more changes in cortical surface area, suggesting greater cortical plasticity. The brain areas that show significant difference among IQ groups are mainly located in the frontal, parietal and temporal lobe, supporting the P-FTT intelligence theory. There is no significant difference found in cortical thickness and 2dReHo developmental curves among different IQ groups. Previous studies have found that the cortical thickness is reatly affected by the environment, while the surface area of the cortex is more affected by heredity. Therefore, the results of this study suggest that intelligence is more affected by congenital factors. 6) The cortical area can predict the raw scores of the intelligence subtests, and the score of the superiorhigh IQ group is more unpredictable, while the raw subtest scores of the average IQ group girls can be explained more by their cortical surface area. The different brain regions involved in the same test indicate that the neural mechanism of the same cognitive function in different IQ groups is different; the overlap of brain regions involved in different tests in the same IQ group provides neural basis evidence for the hypothesis of general factor across intellectual abilities.

The results partly replicated the findings of previous studies, the superiorhigh IQ group show greater cortical plasticity. For the first time, the developmental trajectory, gender differences and development effects on different IQ groups of 2dReHo were analyzed. Cortical surface area showed different in the ability to interpret raw subtest scores in different IQ groups. These provide new insights into the developmental mechanisms of intelligenceand gender differences and their interaction during development.

Document Type学位论文
Recommended Citation
GB/T 7714
张喆. 儿童青少年智力与皮层发展关联研究[D]. 中国科学院心理研究所. 中国科学院心理研究所,2019.
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