Space positional and motion SRC effects: A comparison with the use of reaction time distribution analysis

The analysis of reaction time (RT) distributions has become a recognized standardin studies on the stimulus response correspondence (SRC) effect as it allowsexploring how this effect changes as a function of response speed. In thisstudy, we compared the spatial SRC effect (the classic Simon effect) with themotion SRC effect using RT distribution analysis. Four experiments wereconducted, in which we manipulated factors of space position and motion forstimulus and response, in order to obtain a clear distinction between positionalSRC and motion SRC. Results showed that these two types of SRC effects differ intheir RT distribution functions as the space positional SRC effect showed adecreasing function, while the motion SRC showed an increasing function. Thissuggests that different types of codes underlie these two SRC effects. Potentialmechanisms and processes are discussed.