Judgements of the first stimulus in successive order of click and flash stimuli were investigated by connecting them with either verbal or motor response. Click was presented to either the right or the left ear and flash to either the right or the left visual field of both eyes. In right-handed group (12 subjects), when two stimuli were projected to the left hemisphere, number of correct judgement was higher if the first stimulus was connected with motor response than with verbal response. In both right and latent left-handed (8 subjects) groups correct judgement was higher when the second stimulus connected with motor response was projected to the right than when to~ the left hemisphere, When flash came earlier than click, correct judgement of the first stimulus flash was higher in right than in left group, In both groups click was more easily connected with motor than with verbal response. The results were discussed in relation to laterality difference and compatibility between S and R. It was suggested that in time judgement of click stimulus the first signal system is more predominating than the second system and that in time judgement of flash stimulus the second signal - system is more predominating. Results in right group were interpreted in terms of the second signal. predominance and the left group, the first signal predominance.