Cost minimization during simulated evolution of paired neural networks leads to asymmetries and specialization

Motivated by specialization (lateralization) that occurs in corresponding left and right regions of the cerebral cortex, several past computational models have studied conditions under which functional specialization can arise during learning due to underlying asymmetries in paired neural networks. However, these past studies have not addressed the basic issue of how such underlying asymmetries arise in the first place. As an initial step in addressing this issue, we investigated the hypothesis that underlying asymmetries will appear in paired neural networks during a simulated evolutionary process when fitness is based not only on maximizing performance, but also on minimizing various ‘costs’ such as energy consumption, neural connection weights, and response times. Simulated evolution under these conditions consistently produced networks with left–right asymmetries in region size, excitability and plasticity. These underlying asymmetries were often synergistic, leading to subsequent functional lateralization during network training. While our computational models are too simple for these results to be directly extrapolated to real nervous systems, they provide support for the hypothesis that brain asymmetries and lateralization in biological nervous systems may be a consequence of cost minimization present during evolution, and are the first computational demonstration of emergent population lateralization.     

Sentimental Utility Theory: Interpreting the Utilization of Collective Emotions by the Political Elite Through the Erdoğan‐Obama Friendship

Barack Obama's 2009 visit to Turkey resulted in an Obama‐Mania in Turkish media, followed by a friendship between Obama and Recep Erdo?an, which was widely reported in the media and emphasized in their rhetoric. This article explains the existence of the Erdo?an‐Obama friendship narrative, in spite of no actual political friendship existing. We first interpret their relationship through five key components of political friendship (affect, grand project, altruistic reciprocity, moral obligations, equality) and argue that, despite a strong friendship narrative, their histories, leadership styles, and political goals diverged to such an extent that a friendship never existed. We then introduce sentimental utility theory (SUT) to explain the utility of maintaining the appearance of a friendship. Through SUT, this article illuminates the utility of collective emotions and offers insight into how collective emotions produce ingroup identities and generate stability for a state's population. SUT reveals how Erdo?an utilized the Obama‐mania in Turkey to create a personal bond with Obama which linked himself, and his policies, to Obama and his progressive policies. Future research can deploy SUT to make sense of other claims of friendship and special relationships between states and between state leaders.     

Defining ‚exdurance’

On stage theory, ordinary continuants are instantaneous stages which persist by exduring—by bearing temporal counterpart relations to other such stages. Exduring objects lack temporal extension and there is a sense in which they are wholly present at multiple instants. How then is exdurance different from endurance? I offer a definition of ?exdurance’ that clearly sets it apart from other modes of persistence.