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Papers by Anna C Roosevelt

The First Americans, 2002

All rights reserved. No part of this publication may be reproduced or transmitted in any form or ... more All rights reserved. No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, recording, or any information storage or retrieval system, without permission in writing from the publisher.

Quaternary Geochronology, Vol. 17, pp. 1041—1046, 1998, 1998

Dates are presented for the Paleoindian levels of Pedra Pintada cave in Brazil, based on the ther... more Dates are presented for the Paleoindian levels of Pedra Pintada cave in Brazil, based on the thermoluminescence (TL) and optically stimulated luminescence (OSL) study of ten specimens of heated siliceous stones and three of sand, respectively. Also discussed are the details of preliminary mineralogical, radiographic, and analytical work done on the lithic specimens in France and the OSL work done on the sediments in the US. The luminescence dates are in agreement with radiocarbon dates for the same strata. 1998 Elsevier Science Ltd. All rights reserved.

Bulletin of Latin American Research, 1990

The purpose of the present study was to examine the effects of selective attention to plantar cut... more The purpose of the present study was to examine the effects of selective attention to plantar cutaneous sensation on muscular co-contraction of stroke patients during the stance phase of walking. [Subjects] Seven sub-acute stroke patients participated in this study. [Method] Subjects were given tasks of discriminating hardness differences of foam rubber with the sole of the paretic side. Electromyograms of the paretic leg during walking were recorded before, immediately after, and 15 min after the discrimination tasks. The muscular activity and the co-contraction index (CI) during the stance phase were determined. [Result] The muscular activity of the gastrocnemius and CI of the ankle joint significantly decreased immediately after the discrimination tasks. [Conclusion] These results suggest that selective attention to plantar cutaneous sensation on the paretic side immediately reduces muscular co-contraction of stroke patients during walking.

Human Conflict from Neanderthals to the Samburu: Structure and Agency in Webs of Violence, 2020

State violence in the history of Congo demands attention for several reasons. The largest and mos... more State violence in the history of Congo demands attention for several reasons. The largest and most populous country in Central Africa, it occupies a central location between the Sahara and South Africa and the Atlantic Ocean and the rift valleys (Figs. 1 and 2). 1 The country has the greatest concentration of valuable minerals in the world and very rich biological resources as well. Some of the longest sequences of self-rule by indigenous complex societies in Africa have also been found there. Such characteristics give Congo great potential for political leadership and economic development in the continent of Africa in the future. But the political disorder and violence there since independence have blocked that potential so far. Western literature tends to attribute the multiple crises of the twentieth and twenty-first centuries to African people's political inexperience, disorganization, radicalism, corruption, division, and/or violence and minimize the western roles

Interdisciplinary Contributions To Archaeology

Abstract: Geophysical survey has been integral to the archaeological research strategy of the Low... more Abstract: Geophysical survey has been integral to the archaeological research strategy of the Lower Amazon Project in Brazil from 1983 until the present. In our project, the systematic integration of multiple-instrument geophysical survey with traditional archaeological approaches in ...

Science, 1991

from strong coupling to low frequency modes (19). In the M3C60 materials, the most obvious low fr... more from strong coupling to low frequency modes (19). In the M3C60 materials, the most obvious low frequency modes are C60-C60 intermolecular vibrations or C60 rotations. Alternatively, it has been suggested that the M' optical phonon could lead to strong coupling (13). High-frequency intramolecular C60 modes, which have been implicated in weak-coupling analyses (2, 6), are unlikely to yield the large value of 2A/kTc determined experi

Quaternary Science Reviews, 1998

Latin American Antiquity, May 8, 2018

Journal of Anthropology and Archaeology

Latin American Anthropology Review

Human Evolution

Until recently, the first Americans were thought to be flutedpoint spear-hunters from the Siberia... more Until recently, the first Americans were thought to be flutedpoint spear-hunters from the Siberian steppes. Near the end of the Ice Age, they followed big-game herds over the Bering land bridge into the open, upland habitats of the interior of North America about 12,000 years ago. Rapidly extinguishing the big game herds with their deadly hunting methods, they pressed southward in search of new herds and reached the tip of South America about a thousand years later. Today, nearly 70 years after the first excavations at Clovis, New Mexico, the type site for this culture, new sites and new dates from both North and South America are forcing a revision of the earlier picture of the migrations and adaptations of the first Americans. But despite recurring claims that human colonization of the Western Hemisphere began as early as 20,000 or more years ago with the arrival of generalized foragers lacking a projectile-point tradition, no definitive data gives empirical support for a human presence before c. 12,000 before the present (B.P.). All supposed pre-Clovis cultures except one in Alaska have failed to withstand careful scrutiny of their data. In addition, despite recent claims for cultural and biological links of the migrants to Europe or the Pacific Islands, the skeletons and cultural assemblages of Paleoindians throughout the hemisphere point consistently to a northeast Asian origin. According to new data, Paleoindian ancestors in Beringia c. 12,000 years ago were not specialized, fluted-point hunters of large game, but broad-spectrum hunter-gatherers using triangular or bipointed, lanceolates. Diverse cultures descended from these ancestors, not only the big-game hunting Clovis culture of the North American high plains. And just as Clovis did not set the cultural pattern for the hemisphere, it was not the earliest culture. Fully contemporary with the earliest possible Clovis dates of c. 11,200, in South America there already were maritime foragers on the Pacific coast, small-game hunters in the southern pampas, and tropical forest riverine foragers in the eastern tropical lowlands. The Clovis culture thus was just one of several regional cultures developed in the millennium after the initial migration. It could not have been the ancestor of the other early Paleoindian cultures. This new picture of Paleoindian cultures changes understanding of initial human adaptive radiation in the Americas and has implications for general theories of human evolution and behavioral ecology.

Earth Science Research, 2016

The early and mid 20th century was a time of great interest in the rise of agriculture and its ro... more The early and mid 20th century was a time of great interest in the rise of agriculture and its role in the evolution of civilizations societies in particular environments. Late 20th century efforts to reconstruct the nature and history of prehistoric farming societies in the northern lowlands of South America ranged from expansive hypotheses to regional case studies using archaeobotanical technologies then available. Since 2000, a large number of regional studies using expanded and refined methods have produced broadly interesting results. Approaches from the fields of geography and earth sciences are being recruited increasingly. The resulting empirical evidence does shed light on aspects of the history of human use of some plants but, as always, has raised more questions than it solved. Many of the problems interpreting the processual and evolutionary significance of these findings are methodological ones. This article reviews what seem to be the most important methodological and ...

The Latin American Anthropology Review, 2008