Correlation between Handedness and Intelligence among School Children (original) (raw)
Related papers
International Journal of Anatomy and Research, 2019
Handedness is perhaps the most overt reflection of lateralization of the central nervous system in humans. Humans show a strong and population-level bias toward using one hand rather than the other for manual activities, which is unusual among mammals. As handedness is biologically and genetically linked, so it has various effects on one's behaviour and abilities. Since intelligence has an impact on human behaviour, intelligence is considered an important aspect. Language is a system by communication. The meaning of anything is created by using symbols and our intelligence can be communicated to others by reading, speaking and writing. Researchers argue that right handers are more intelligent than the left handers and this is the reason behind changing the handedness of the children. This present study aims at finding the authencity of this opinion. Aim: We assessed the cerebral dominance and association between handedness and intelligence among school students. Method: Lateral preference inventory for handedness and Raven's Standard Progressive Matrix Test for intelligence. Statistical method used: IBM statistics-20. The P-Values less than or equal to 0.05 (<0.05) were considered as statistically significant. Result: Statistical significance results were observed between left and right handers in terms of gender, age and educational standards. Conclusion: Left handed students were more intelligent than right handed students. Furthermore if more accessories are specially designed for left handers, they can achieve much more better.
Handedness and intellectual achievement: An even-handed look
Neuropsychologia, 2008
Evidence from a large-scale study of 11-year olds in Britain suggests that ambidextrous individuals may be disadvantaged in tests of verbal, nonverbal, reading, and mathematical skills relative to right-and left-handers, but this basic finding was not replicated in another study of younger boys in Germany. Here, we present data based on a television show in which members of the public were given an IQ test. Some individuals were also asked to state whether they wrote with the left hand, right hand, or either hand. The data support the earlier finding that ambidextrous individuals perform more poorly than left-or right-handers, especially on subscales measuring arithmetic, memory, and reasoning, and extend that finding to adults.
Handedness and Sex Differences in Intelligence: Evidence from the Medical College Admission Test
Brain and Cognition, 1998
Our analysis of Medical College Admission Test subtest scores by writing hand preference and sex suggests that (a) right hemispheric dominance is associated with intellectual giftedness in verbal reasoning (left-handers obtained higher scores on the verbal reasoning test and were overrepresented in the upper tail of the distribution), (b) different patterns of brain lateralization are associated with different subcomponents of cognition (right-handers scored higher, on average, on the writing test and were overrepresented in the upper tail of the distribution), and (c) men generally score higher than women on tests of scientific knowledge (the most striking differences between men and women were on the biological and physical science tests).
Association between Handedness and Socio-demographical factors among School Children
IOSR Journal of Dental and Medical Sciences, 2016
Symmetry is defined as correspondence in size , shape and relative position of parts on opposite sides of a dividing line or median plane. Handedness is one of the most obvious functional asymmetries. Approximately 90% of all subjects are right handed ,the remaining 10% of the population are left handed. Lefthandedness results from perinatal left hemisphere neurological damage, due to an oxygen deficiency induced by birth stress. Studies do show that there is a predictable relationship between laterality and sleep disturbance. There are several developmental factors implied in handedness in humans. There have been studies using one or some measures but using a wide range of the measures is rare in research literature. Against this backdrop this study examines the association between handedness and various socio-demographical factors.
Laterality, hand control and scholastic performance: a British birth cohort study
BMJ Open, 2012
Objectives: To use simple measures of laterality and hand control that can identify a greater risk of poorer scholastic ability, potentially signalling suboptimal hemispheric lateralisation. Design: Analysis of material from a birth cohort study. Setting: Members of the National Child Development Study, a British birth cohort study following people born in 1958. Participants: 10 612 children who undertook tests at age 11 years. Primary outcome measures: Teacher-administered tests of non-verbal general ability, verbal general ability, reading comprehension and mathematics. Results: Linear regression produced associations (and 95% CIs) with tests of verbal general ability, nonverbal general ability, reading comprehension and mathematics scores for the lowest third (compared with highest) of a left-hand control test involving picking up matches of À1.21 (À1.73 to À0.68; p<0.001), À0.72 (À1.14 to À0.29; p¼0.001), À0.70 (À1.06 to À0.35; p<0.001) and À1.32 (À1.90 to À0.73; p<0.001). Among those in the lowest third of the right-hand control test score, mixed-handedness compared with right-handedness was associated with poorer scholastic performance, with regression coefficients (and 95% CIs; p values) of 1.90 (À3.01 to À0.80; p¼0.001), À1.25 (À2.15 to À0.35; p¼0.007), À1.28 (2.04 to À0.53; p¼0.001) and À1.33 (À2.53 to À0.13; p¼0.030). The estimates are for a point change in the scholastic test scores, after adjustment for sex, left-hand motor function and social class. Statistically significant associations with mixed-handedness were only observed for the lowest third of right-hand motor function. Conclusions: Measures involving poorer left-hand motor function may represent useful markers of reduced cognitive function possibly reflecting suboptimal hemispheric lateralisation. Crude measures of laterality such as reported non-right-handedness may be more useful for research when combined with measures of motor function.
Intellectual differences in relation to personal and family handedness
Right, mixed and left-handed college students were given the complete WAIS, and a series of cognitive factor tests. Results showed left- and mixed-handed individuals to have a significantly lower full scale I.Q. than right-handers. There was no difference between the mixed and left-handers. In all three handedness groups, subjects with a positive family history of sinistrality had a lower full scale I.Q. than did subjects without left-handed relatives. Neither handedness nor family history differentially affected the Verbal or Performance subscales, nor did they have a significant effect on scores in the other cognitive tests. These results are discussed with respect to Levy’s theory of hemispheric specialization, and to the role of inheritance and brain damage in the causation of left- and mixed-handedness.
An Investigation of the Association between Handedness, Cognition, Brain Structure and Function
2011
Left- and right-handers show functional and structural brain differences. However, the literature on the relationship between handedness and cognitive ability is inconsistent. Moreover, possible differences in the neuroanatomical correlates of cognitive ability, including regional grey matter (GM) volume, between left- and right-handers have not been explored. This thesis describes work with two main aims: (i) to explore differences in brain structure and function between left- and right-handers using MRI on a sample of left- (n=40) and right- (n=42) handers, and (ii) to explore the effect of handedness on the neuroanatomical correlates of cognitive capacity on the same cohort. The effect of sex and handedness on pars opercularis (PO) and pars triangularis (PTR) volume and the sulcal contours defining these regions are described in Chapter 5. PO volume asymmetry is leftward (left-greater-than-right) in right-handed males, non-asymmetrical in right-handed females and rightward in lef...
Studies that investigate handedness are performed in order to relate hemispheric specialization and cognitive performance. The aim of study was compare the neuropsychological performance between right-handed and left-handed children with ages from five to six years who participated in the Brazilian study of standardization of the Developmental Neuropsychological Assessment. For analysis of socio-demographic characteristics, descriptive statistics were used. To compare the mean scores between the groups, normality was tested using Analysis of Variance (one-way Anova) and the Kruskal-Wallis test. When comparing right-handed and left-handed children with typical development, left-handed children presented poorer performance on the subtests involving Attention and Executive Functioning, Language, and Learning and Memory.