Studies of primate cognition have conclusively shown that humans and apes share a range of basic cognitive abilities. As a corollary, these same studies have also focussed attention on what makes humans unique, and on when and how specifically human cognitive skills evolved. There is widespread agreement that a major distinguishing feature of the human mind is its capacity for causal reasoning. This paper argues that causal cognition originated with the use made of indirect natural signs by early hominins forced to adapt to variable late Miocene and early Pliocene environments; that early hominins evolved an innate tendency to search for such signs and infer their causes; that causal inference required the existence of incipient working memory; and that causal relationships were stored through being integrated into spatial maps to create increasingly complex causal models of the world.
Laos constituted one of the five territorial entities making up French Indochina—comprising in addition the colony of Cochinchina and the protectorates of Annam, Tonkin and Cambodia. It was never, however, one among equals. Even before the annexation of Lao territories east of the Mekong river in 1893, Laos was perceived as little more than an extension of Vietnam west towards Siam (Thailand), a much more significant potential prize. The addition of minor extensions west of the Mekong demarcated by treaty in 1904 and 1907 still gave France no more than half the former Lao Kingdom of Lan Xang. Any possibility of reconstituting a greater Lao state was thereafter lost.
Several attempts have been made recently to apply Darwinian evolutionary theory to the study of culture change and social history. The essential elements in such a theory are that variations occur in a population, and that a process of selective retention operates during their replication and transmission. Location of such variable "units" in the semantic structure of cognition provides the individual psychological basis for an evolutionary theory of history. Selection operates on both the level of cognition and on its "phenotypic" expression in action in relation to individual preferred sources of psychological satisfaction. Social power comprises the principal selective forces within the sociocultural environment. Sociocultural evolution takes place both as a result of the unintended consequences of action and through the struggle of individuals and groups in pursuit of opposing interests. The implications for historiography are methodological in that evolutionary theory of history sharpens the focus of explanatory situational analysis, and interpretive in that it provides a paradigmatic metanarrative for the understanding of historical change.Over the last decade and more, social scientists in a number of disciplines have attempted to apply Darwinian evolutionary theory to human societies and cultures. 1 One only has to think of R. D. Alexander and William H. Durham among anthropologists; W. G. Runciman and Stephen K. Sanderson among sociologists; Roger D. Masters and Glendon Schubert among political scientists; J. Tooby and L. Cosmides, and David M. Buss among psychologists; and J. Hirshleifer and Kenneth Boulding among economists. 2 Such scholars have sought to understand in Darwinian evolutionary terms how cultures evolve, the processes of social and political change, why the human psyche has the form and function it does, and how economic enterprises compete. Historians, however, have been slow to 1. No longer can it be claimed that sociocultural evolution based on a generalized Darwinian model is an "untried theory.
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