Effect of colour of object on simple visual reaction time in normal subjects

The measure of simple reaction time has been used to evaluate the processing speed of cns and the co-ordination between the sensory and motor systems. as the reaction time is influenced by different factors; the impact of colour of objects in modulating the reaction time has been investigated in this study. 200 healthy volunteers (female gender 100 and male gender100) of age group 18-25 yrs were included as subjects. the subjects were presented with two visual stimuli viz; red and green light by using an electronic response analyzer. paired 't' test for comparison of visual reaction time for red and green colour in male gender shows p value<0.05 whereas in female gender shows p<0.001. it was observed that response latency for red colour was lesser than that of green colour which can be explained on the basis of trichromatic theory. © journal of krishna institute of medical sciences university.