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Prior to the passage of the 20th amendment to the US Constitution in 1920, several states had extended the suffrage to women. Helen Laura Sumner (later Woodbury), a student of John R. Commons at Wisconsin, undertook a statistical study of the political, economic, and social impacts of the granting of voting rights to women in the state of Colorado, and subsequently defended the results against numerous attacks. In this paper, we present a brief account of the struggle for women’s equality in the extension of the suffrage and examine Sumner’s critical analysis of the evidence as to its effects, as well as the counterarguments to which she responded.

Inhibitory control (IC) is a central executive function that shows significant development throughout the preschool years. IC is known as a factor that underlies the ability to self-regulate in daily situations. This ability is challenged when a child faces negative emotions; a challenge that is seen in children’s IC performance and brain activity. This chapter elaborates on the effects that negative emotional experiences have on children’s IC functioning. Moreover, previous studies regarding the way emotional experiences are reflected in brain activity are included. Additionally, this chapter will offer a comprehensive review of the factors affecting individual differences in IC, including the role of children’s temperamental effortful control and negative affectivity. Further, the role of parenting behaviors will be discussed, focusing on the way in which maternal self-regulation influences child inhibitory control, including related educational implications.