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Classical definitions of motivation typically involve two main components: direction and activation. Motivated behavior is directed toward or away from particular stimuli (i.e., appetitive and aversive motivation). Furthermore, activational aspects of motivation refer to the observation that motivated behavior is characterized by substantial activity, vigor, persistence, and exertion of effort in both the initiation and maintenance of behavior. Although separate neural systems direct organisms toward distinct motivational stimuli (e.g., food, water, sex), there appears to be a common circuitry regulating behavioral activation and the exertion of effort. Mesolimbic dopamine is one of the brain systems mediating activational aspects of motivation and exertion of effort. This system integrates aspects of motivation and motor control functions involved in the instigation of action. Research on the neurobiology of effort has contributed to our understanding of the pathophysiology of neurological and psychiatric disorders that are characterized by motivational dysfunction.

This paper reassesses the center-periphery relationship in light of recent developments in the international monetary system and the currency hierarchy in a geopolitical economy framework. The center-periphery relationship has historically been examined in relation to the international division of labor, the pace and diffusion of technical progress associated with it, and the pattern of consumption it embodies. As conceived by structuralists and dependentistas, it is not seen as the result of the uneven and combined development of capitalism: it does not take into account the struggle between the dominant States (center), which want to reproduce the current order and the contender States (periphery) which aim to accelerate capitalist development to reduce the unevenness, and even to undermine the imperial project of dominant states. In a geopolitical economy framework, a powerful obstacle peripheral countries face in their efforts at combined development is the international monetary system, something that the theorists of the center-periphery relationship have perhaps overlooked. Because of its subordinate position in the currency hierarchy, the periphery is subject to greater external vulnerability, greater instability of exchange and interest rates, and as a result, enjoys a more restricted policy space. In this sense, the chapter shows that, beyond macroeconomic policies, the currency hierarchy in a context of high capital mobility limits a range of developmental policies of peripheral countries, reinforcing the unevenness of world economy and constraining combined development.

Torture has been practiced for millennia, albeit the means, rationales, and objectives have changed. (For an extended discussion of torture's past, see Hajjar, 2009.) Starting in the 12th century, the rediscovery of Roman law in western Europe revived torture as an aspect of criminal legal processes, both ecclesiastical and secular. According to Edward Peters (1996, p. 41), “the inquisitorial procedure displaced the older accusatorial procedure. Instead of the confirmed and verified freeman's oath, confession was elevated to the top of the hierarchy of proofs…[T]he place of confession in legal procedure…explains the reappearance of torture in medieval and early modern law.”