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成果シンポジウム:先史文化進化の展望:考古学から行動実験まで
Symposium: Perspectives on Prehistoric Cultural Evolution: From Archaeology to Behavioral Experiment

日時・場所:2017年8月7日-8日,AP品川

開催趣旨

現代的な文化進化研究は1970年代に始まり、様々な分野を巻き込みながら領域を広げてきた。文化に関するかつての進化理論が、一定の経路に沿った社会の「変態」の過程を思い描いたのに対して、現代的な理論が想定するのは、集団内の文化的多様性が革新と個体間の伝達を通じて時間とともに変化する過程である。先史社会における文化進化を復元する試みは、本質として学際的である。なかでも考古学は、文化進化の記録を最も直接的に扱う分野であるが、昨今それらの記録が、進化生物学の手法を用いて分析されている。さらに新しい展開として、人々が持つ学習のバイアスに関する行動実験が注目されている。個体レベルの学習バイアスは、集団レベルの文化現象の根本的な動因である。本シンポジウムでは、文化進化研究の学際的な性質を強調し、関連分野の最新の知見を提供する。

The modern study of cultural evolution, emerged around 1970's, has attracted researchers from various fields and is increasingly widening its scope. Unlike the historical attempts at describing "metamorphoses" of societies under the rubric of evolution, the modern theory sees cultural evolution primarily as temporal changes in cultural variation within a population due to innovation and transmission between individuals. The endeavor to reconstruct cultural evolution in prehistoric societies is by nature interdisciplinary. Archaeology, among all, has the most direct access to records of past cultural evolution, which have been investigated within the analytical framework developed in evolutionary biology. A more recent move is toward behavioral experiments on individual-level learning biases, which are the fundamental drive of population-level cultural phenomena. This symposium emphasizes the interdisciplinary nature of the study and aims at providing the most recent developments in the related fields.

スケジュール

8月7日

13:30-13:40 Opening remarks

13:40-14:20 井原康雄(東京大学)

14:20-15:00 田村光平(東北大学)

15:00-15:15 Coffee break

15:15-15:55 田村光平・松木武彦(国立歴史民俗博物館)

Geometric morphometrics of keyhole-shaped mounds

Abstract: Kofun or keyhole-shaped mounds are monuments characterizing the Kofun period or the period of the state formation in Japan. They have been a subject of intensive research because similarities in shapes of the mounds have been considered to be a proxy of political connections. As a notable exception in Japanese archaeology, a series of studies on shapes of the keyhole-shaped mounds have used quantitative methods since Ueda’s (1963) pioneer work. However, the majority of the previous studies have several limitations such as being based on a few morphological attributes and over-dependence on typology. The present study analyzed the shapes of keyhole-shaped mounds by using methods in geometric morphometrics, which have been developed to analyze biological shapes in a quantitative manner. Our results quantify and visualize the relationships between the shapes of the mounds, indicating a large amount of morphological diversity of the mounds which have not been fully captured by typological understanding.

15:55-16:35 中尾央(山口大学)・中川朋美(岡山大学)

16:35-17:05 三中信宏(国立研究開発法人農業・食品産業技術総合研究機構)

Systematic thinking in archaeology and prehistory: Toward a general theory of cultural phylogenetics

Abstract: Phylogenetic reconstruction in general aims at estimating the most plausible tree or network based on character data of spatiotemporally evolving objects. In evolutionary biology, textual stemmatics, historical linguistics, and cultural evolution researchers have independently and repetitively developed a set of rules for building phylogenetic diagrams from data on organisms, manuscripts, languages, and cultural constructs, respectively. All these sciences have in common the basic features of historiographic sciences. Estimating evolutionary history searches for the best solution among alternative phylogenetic hypotheses. However, the best solution isn't necessarily true in a historical sense because we can't observe directly or experimentally the past evolutionary processes and its consequent patterns. All we can do is to find the best estimate as accurately as we can by comparing all possible trees or networks on the basis of some optimality criterion such as parsimony, or (if possible) likelihood, etc. An iconographical survey of historical development from ancient times to the present of phylogenetic diagrams reveals a wider array of various graphical tools (chain, tree, and network) for visualizing object-diversity and its spatiotemporal modification. These graphical tools could be used for selecting efficient structural models for estimating phylogenies and constructing classifications of evolving objects. All these historiographic sciences share not only basic principles for reconstructing the past but also practical methods of visualizing object-diversity. The historical development of a general theory of systematics is better considered within the context of genealogical visualization and information graphics.

8月8日

10:00-10:50 Thomas E. Currie (University of Exeter)

10:50-11:40 Enrico R. Crema (University of Cambridge)

Can we infer patterns of cultural transmission from archaeological data?

Abstract: The field of cultural evolutionary studies has developed a rich repertoire of mathematical models of social learning. Early foundational works have laid the foundation of more recent endeavours, and several studies have attempted to infer patterns of cultural transmission from empirically observed frequencies of cultural data, from decorative motifs on potsherds to baby names, musical preferences, and dog breeds. While this wide range of applications provides an opportunity for the development of generalizable analytical work-flows, archaeological data present new questions and challenges that require further methodological and theoretical discussions. What are the inferential implications of relying on the changing frequencies of artefacts rather than ideas? How do we deal with issues of taphonomic bias and time-averaging? Can we safely assume that the recorded frequencies are from a system at its equilibrium? This paper will overview some recent attempts based on a generative inferential framework that could overcome some of these issues. Within this framework, competing hypothesis are formulated as computer simulations and compared against the archaeological record within an approximate Bayesian framework. I will illustrate this approach through a case study from Neolithic Germany, discussing how it tackles some of the most challenging aspects imposed by archaeological data.

11:40-13:00 Lunch time

13:00-13:50 竹澤正哲(北海道大学)

13:50-14:40 Alex Mesoudi (University of Exeter)

14:40-15:00 松本直子(岡山大学)

15:00-15:30 Discussion

15:30 Concluding remarks