Related Experiment Videos
Handedness in mental retardation
M K Mandal1, G Pandey, C T Das
1Department of Psychology, Banaras Hindu University, Varanasi, India.
Laterality
|October 30, 2004
Summary
Intellectual disability is linked to mixed handedness, unlike typical individuals who show a strong rightward preference. This difference was observed in both skilled and unskilled tasks, suggesting altered lateralization in this population.
Area of Science:
- Neuroscience
- Developmental Psychology
- Human Genetics
Background:
- Handedness, a common human trait, is typically rightward biased.
- Altered patterns of brain lateralization have been suggested in individuals with intellectual disability.
- Parental sinistrality (left-handedness) was controlled for to isolate genetic factors.
Purpose of the Study:
- To investigate handedness patterns in individuals with intellectual disability compared to neurotypical controls.
- To determine if skilled and unskilled hand tasks reveal differences in handedness within these groups.
- To explore potential links between intellectual disability and atypical cerebral lateralization.
Main Methods:
- Utilized the Waterloo Handedness Questionnaire (Singh & Bryden, 1994) for handedness assessment.
- Compared handedness in individuals with intellectual disability and age-matched normal controls.
- Analyzed performance differences between skilled and unskilled hand items.
Main Results:
- Normal controls exhibited a significant rightward bias, more pronounced for skilled hand items.
- Individuals with intellectual disability displayed mixed handedness.
- No significant difference in performance between skilled and unskilled hand items was found in the intellectually disabled group.
Conclusions:
- Intellectual disability is associated with mixed handedness, contrasting with the typical rightward bias.
- The findings suggest potential differences in cerebral lateralization or its development in individuals with intellectual disability.
- Further research is warranted to elucidate the neurodevelopmental underpinnings of these handedness variations.