sentences:  Some variations of the experiment found delays as long as 60 milliseconds or about 10% of the average reaction time—a small difference but a significant one.Dehaene's experiments were not designed specifically to investigate 0 but to compare competing models of how parity information is processed and extracted.The most specific model, the mental calculation hypothesis, suggests that reactions to 0 should be fast; 0 is a small number, and it is easy to calculate .