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“Mentally challenged children’s performance comparison to evaluate their brain’s motor function - by applying finger tapping subtest test of neuropsychological battery” this is  a research problem to know that mental retardation is affecting their motor co-ordination function on not”. Neuro-psychological assessment test battery which was developed by NIMHANS, Bangalore in the year of 2004 and its sub-test Finger tapping test was administered for research. By random sampling method, samples were collected from B.M Institute of Mental Health, Ahmedabad in the year of 2012. Based on Government Civil hospital’s IQ certificate 75 mild category of MR children of above and below graduate parents were taken for research with prior permission. Mental Retardation based on various diagnosis like; Down syndrome, microcephaly, hydrocephaly, trisomy-13, trisomy-18 or multiple disabilities are included. Flowingly, Children’s age group and gender are also kept different to compare their performance on finger tapping test. The results shows the “t” value of Neuropsychological functions of finger tapping test (Right hand) of mild children of different educational level of parents is 0.12. The mean scores of finger tapping test (Right hand) of mild children of above and below graduate parents were found 36.08 and 36.38 respectively with SD 8.50 and 12.56. The results indicate that significant difference does not exist between mild children of below and above graduate parents with regard to finger tapping test (Right hand). In the light of the hypothesis that there will be no significant difference between mild children of below and above graduate parents on finger tapping test (Right hand). It implies that mild children of below and above graduate parents have no significant difference of performance on finger tapping test (Right hand). Based on the result it depicts that mild children of below and above graduate parents’ children have similar performance on finger tapping test (Right hand). The results shows the “t” value of Neuropsychological functions of finger tapping test (Left hand) of mild children of educational level of parents is 0.55. The mean scores of finger tapping test (Left hand) of mild children of above graduate parents were found 34.49 and 35.92 respectively with SD 9.18 and 13.03. The results indicate that significant difference exist between mild children of below graduate parents and mild children of above graduate parents with regard to finger tapping test (Left hand). In the light of the hypothesis that there will be no significant difference between mild children of below and above graduate parents on finger tapping test (Left hand). It implies that mild children of below and above graduate parents have no significant difference on finger tapping test (left hand). Mild children of above and below graduate parent’s children have similar performance on finger tapping test (left hand). On the basis of result it is concluded that Mild MR category of above and below graduate parent’s children have similar performance on Finger tapping test in both Right and Left hand. It depicts that these children are fair in their motor function of motor speed and co-ordination. 75 children’s mental retardation does not affected on their brain’s motor function performance.