Final answer:
Research has provided support for Carl Rogers' ideas of self-consistency and congruence, with examples including studies on cognitive dissonance theory, self-serving attributions, and self-efficacy.
Step-by-step explanation:
Research has provided support for Carl Rogers' ideas of self-consistency and congruence. One example is a study by Greenwald and Ronis (1978) that examined cognitive dissonance theory, which is related to self-consistency. Another example is the research conducted by Roesch and Amirkham (1997) on self-serving attributions, which can affect congruence. Additionally, Bandura (1977) studied self-efficacy, a concept related to congruence between one's beliefs about oneself and one's abilities. These studies provide evidential support for Rogers' ideas of self-consistency and congruence.