Do internal and external sources need to be complementary in order for motivation to occur?

Yes, internal and external sources often need to be complementary for effective motivation to occur. Internal sources, such as personal values and intrinsic interests, can enhance the impact of external sources like rewards and recognition. When these sources align, individuals are more likely to feel motivated and engaged, leading to better performance and satisfaction. Conversely, a mismatch between internal and external motivators can lead to confusion and decreased motivation.