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Subjects were asked to draw a line of fixed length, through a prescribed horizontal track using the light pen which is a computer interface (similar in action to the mouse), which is connected to the personal computer and programmed to capture the deviations of the hand movement and measure its latency. The ratio of the horizontal deviations to the vertical deviations is termed as skew ratio. The latency (reaction time) was measured and skew ratio was calculated for each subject. Males and females subjects were examined. A comparative study of the effect of reaction time (latency) on skew ratio of the horizontal hand movement for controls and others suffering from mental illness have been conducted. Controls mean reaction time was equal to 2.15s and 5.28s for males and females, respectively; while they were equal to 7.32s and 7.33s for male and female patients, respectively. Reaction time was lower for controls compared to that of patients; which ascertain its dependence on state of health and gender. Controls mean skew ratio was equal to 36.5 for males and equal to 27.6 for females, while this ratio was equal to 4.9 for abnormal males and was equal to 3.8 for abnormal females respectively. A high value of skew ratio and a small value of reaction time are indicators of sound hand movement and hence good health while low values are indicators of poor hand movement and hence poor health. When gender was considered the skew ratio for normal males to normal females was found to be as high as 1.32:1, while that for abnormal males to females was found to be as high as 1.29: 1 which ascertain its dependence on gender. No relationship was noticed between Skew ratio and Reaction time.

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