An experiment was conducted to determine whether or not response-response compatability effects were present in a simple perceptual-motor task where simultaneous two-hand pointing responses were required. The results indicate that both response precision and movement time are affected by the particular combinations of responses used. The results are interpreted as supporting the contention that R-R compatibility effects do exist—even in quite simple perceptual-motor tasks. A distinction is made between Stimulus-Response (S-R) compatibility effects and Response-Response (R-R) compatability effects.
