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Abstract
Sixty mentally retarded students classified at the Denton State School as moderately and mildly retarded were given grip strength tests with a Jamar dynamometer to determine the effect of the tonic neck posture upon preferred and nonpreferred grip. The independent variable was tonic neck posture, represented by 3 different positions of the head. The dependent variable was grip strength of the preferred and nonpreferred hands. The multivariate ANOVA of differences in grip strength scores revealed that grip strength performance of the mental retardates is a function of tonic neck posture and is consistent with the facilitation and inhibition parameters of the tonic neck reflex.