Figure 1. The inverted U-shaped curve of the Yerkes-Dodson Law. The single-shafted arrow represents the parents' attempt to push the child up toward the peak of performance. The double-shafted arrow represents the actual effect of the parental pushing. Reproduced from reference 63: Curtin LL. The Yerkes-Dodson law. Nurs Manage. 1984:15:7-8. Copyright© 1984: Lippincott, Williams and Wilkins.