Figure 4. Effects of perceived task difficulty on the expected value of control and behavior.
A) According to the EVC theory, higher perceived difficulty is predicted to decrease control intensity. B-C) In the lower range of expected task difficulty, positive mood (low expected difficulty) reduces the congruency sequence effect and switch cost in reaction times and in error rates. D-E) In the upper range of expected task difficulty, positive mood (low expected difficulty) increases congruency sequence effect and switch cost in reaction times and in error rates.