Search

Your search keyword '"Walker, Robert S."' showing total 333 results
Start Over Author "Walker, Robert S."
333 results on '"Walker, Robert S."'

1. Effects of Voice Pitch on Social Perceptions Vary With Relational Mobility and Homicide Rate

Author

Aung, Toe, primary, Hill, Alexander K., additional, Hlay, Jessica K., additional, Hess, Catherine, additional, Hess, Michael, additional, Johnson, Janie, additional, Doll, Leslie, additional, Carlson, Sara M., additional, Magdinec, Caroline, additional, G-Santoyo, Isaac, additional, Walker, Robert S., additional, Bailey, Drew, additional, Arnocky, Steven, additional, Kamble, Shanmukh, additional, Vardy, Tom, additional, Kyritsis, Thanos, additional, Atkinson, Quentin, additional, Jones, Benedict, additional, Burns, Jessica, additional, Koster, Jeremy, additional, Palomo-Vélez, Gonzalo, additional, Tybur, Joshua M., additional, Muñoz-Reyes, José, additional, Choy, Bryan K. C., additional, Li, Norman P., additional, Klar, Verena, additional, Batres, Carlota, additional, Bascheck, Patricia, additional, Schild, Christoph, additional, Penke, Lars, additional, Pazhoohi, Farid, additional, Kemirembe, Karen, additional, Valentova, Jaroslava Varella, additional, Varella, Marco Antonio Correa, additional, da Silva, Caio Santos Alves, additional, Borras-Guevara, Martha, additional, Hodges-Simeon, Carolyn, additional, Ernst, Moritz, additional, Garr, Collin, additional, Chen, Bin-Bin, additional, and Puts, David, additional

Published
2024
Full Text
View/download PDF

4. Clovis bone versus stone weapon tip penetration: Thinking about relative costs and benefits, experimental assumptions, and archaeological unknowns at Sheriden Cave, Ohio, U.S.A

Author

Conrad, Grace, primary, Hough, Savannah, additional, Baldino, Jacob, additional, Gala, Nicholas, additional, Buchanan, Briggs, additional, Walker, Robert S., additional, Key, Alastair, additional, Redmond, Brian G., additional, Bebber, Michelle R., additional, and Eren, Metin I., additional

Published
2023
Full Text
View/download PDF

14. Another tool in the experimental toolbox: On the use of aluminum as a substitute for chert in North American prehistoric ballistics research and beyond

Author

Eren, Metin I., primary, Mukusha, Lawrence, additional, Lierenz, Julie, additional, Wilson, Michael, additional, Bebber, Michelle R., additional, Fisch, Michael, additional, True, Trent, additional, Kavaulic, Michael, additional, Walker, Robert S., additional, Buchanan, Briggs, additional, and Key, Alastair, additional

Published
2022
Full Text
View/download PDF

16. Comparing Clovis and Folsom fluting via scaling analysis.

Author

Buchanan, Briggs, Hamilton, Marcus J., Gala, Nicholas, Smith, Heather, Wilson, Michael, Eren, Metin I., and Walker, Robert S.

Subjects
FLUTE, RESEARCH personnel, PLEISTOCENE Epoch
Abstract

This study examines the fluting of two well‐known Late Pleistocene fluted point types in North America: Clovis and Folsom. Using scaling analyses, we assess the changing relationship between flute length and point length in a large sample of each type. Researchers use scaling to investigate the physical constraints of an object and determine how its dimensions change with size. We compare the strength and consistency of the scaling relationships between the older Clovis and the younger Folsom with the aim of shedding light on scaling differences, if any, over their temporal span. Our results show that there is a significant difference in the relationship of fluting length to point length between these types. In Folsom point manufacture, flute length increases nearly twice as fast with increasing point length than in Clovis. Importantly, the scaling of flute length to point length relationship is isometric (linear) in the Folsom sample, whereas it is allometric (sublinear) in the Clovis sample. In other words, Folsom flintknappers maintained a constant ratio of flute length to point length. Clovis flintknappers were less concerned about maintaining this ratio. We attribute this difference to a potentially increasing, or changing, functional role of fluting in Folsom. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

17. Bullet ricochet mark plan-view morphology in concrete: an experimental assessment of five bullet types and two distances using machine learning.

Author

Eren, Metin I, Romans, Jay, Walker, Robert S, Buchanan, Briggs, and Key, Alastair

Subjects
MACHINE learning, BULLETS, INDEPENDENT variables, RANDOM forest algorithms, MORPHOLOGY
Abstract

Bullet ricochets are common occurrences during shooting incidents and can provide a wealth of information useful for shooting incident reconstruction. However, there have only been a small number of studies that have systematically investigated bullet ricochet impact site morphology. Here, this study reports on an experiment that examined the plan-view morphology of 297 ricochet impact sites in concrete that were produced by five different bullet types shot from two distances. This study used a random forest machine learning algorithm to classify bullet types with morphological dimensions of the ricochet mark (impact) with length and perimeter-to-area ratio emerging as the top predictor variables. The 0.22 LR leaves the most distinctive impact mark on the concrete, and overall, the classification accuracy using leave-one-out cross-validation is 62%, considerably higher than a random classification accuracy of 20%. Adding in distance to the model as a predictor increases the classification accuracy to 66%. These initial results are promising, in that they suggest that an unknown bullet type can potentially be determined, or at least probabilistically assessed, from the morphology of the ricochet impact site alone. However, the substantial amount of overlap this study documented among distinct bullet types' ricochet mark morphologies under highly controlled conditions and with machine learning suggests that the human identification of ricochet marks in real-world shooting incident reconstructions may be on occasion, or perhaps regularly, in error. Key points Bullet ricochet impact sites can help with shooting incident reconstruction. A random forest machine learning algorithm classified bullet type from ricochet morphology. Results suggest that unknown bullets can potentially be determined from ricochet impact site morphology. Human identification of bullet types from ricochet sites may be erroneous. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

19. Contributors

Author

Ahern, James C.M., primary, Allchin, Douglas, additional, Aradhye, Chinmay, additional, Bliss, Catherine, additional, Blumler, Mark A., additional, Bogin, Barry, additional, Cook, Della C., additional, Diogo, Rui, additional, Dressler, William W., additional, Elias, Peter M., additional, Flinn, Mark V., additional, Futuyma, Douglas J., additional, Gangestad, Steven W., additional, Gluckman, Peter D., additional, Grebe, Nicholas M., additional, Hanson, Mark A., additional, Hart, Donna, additional, Hartstone-Rose, Adam, additional, Holloway, Ralph L., additional, Holt, Brigitte M., additional, Hunt, Kevin D., additional, Kayser, Manfred, additional, Lao, Oscar, additional, Leonard, William R., additional, Lieberman, Philip, additional, Little, Michael A., additional, Low, Felicia M., additional, Martin, Robert D., additional, Morand, Serge, additional, Muchlinski, Magdalena N., additional, Núñez-de la Mora, Alejandra, additional, Petto, Andrew J., additional, Relethford, John H., additional, Sattenspiel, Lisa, additional, Schick, Kathy, additional, Sept, Jeanne, additional, Sievert, Lynnette L., additional, Simpson, Scott W., additional, Sussman, Robert W., additional, Toth, Nicholas, additional, Valeggia, Claudia R., additional, Vonk, Jennifer, additional, Walker, Robert S., additional, Ward, Carol V., additional, Watts, David P., additional, Wiley, Andrea S., additional, Williams, Mary L., additional, and Worthman, Carol M., additional

Published
2015
Full Text
View/download PDF

32. Sexual selection on male vocal fundamental frequency in humans and other anthropoids

Author

Puts, David A., Hill, Alexander K., Bailey, Drew H., Walker, Robert S., Rendall, Drew, Wheatley, John R., Welling, Lisa L. M., Dawood, Khytam, Cárdenas, Rodrigo, Burriss, Robert P., Jablonski, Nina G., Shriver, Mark D., Weiss, Daniel, Lameira, Adriano R., Apicella, Coren L., Owren, Michael J., Barelli, Claudia, Glenn, Mary E., and Ramos-Fernandez, Gabriel

Published
2016

34. sj-doc-1-naa-10.1177_01976931221074386 - Supplemental material for Another tool in the experimental toolbox: On the use of aluminum as a substitute for chert in North American prehistoric ballistics research and beyond

Author

Eren, Metin I., Mukusha, Lawrence, Lierenz, Julie, Wilson, Michael, Bebber, Michelle R., Fisch, Michael, True, Trent, Kavaulic, Michael, Walker, Robert S., Buchanan, Briggs, and Key, Alastair

Subjects
Anthropology, FOS: Sociology
Abstract

Supplemental material, sj-doc-1-naa-10.1177_01976931221074386 for Another tool in the experimental toolbox: On the use of aluminum as a substitute for chert in North American prehistoric ballistics research and beyond by Metin I. Eren, Lawrence Mukusha, Julie Lierenz, Michael Wilson, Michelle R. Bebber, Michael Fisch, Trent True, Michael Kavaulic, Robert S. Walker, Briggs Buchanan and Alastair Key in North American Archaeologist

Published
2022
Full Text
View/download PDF

35. sj-doc-2-naa-10.1177_01976931221074386 - Supplemental material for Another tool in the experimental toolbox: On the use of aluminum as a substitute for chert in North American prehistoric ballistics research and beyond

Author

Eren, Metin I., Mukusha, Lawrence, Lierenz, Julie, Wilson, Michael, Bebber, Michelle R., Fisch, Michael, True, Trent, Kavaulic, Michael, Walker, Robert S., Buchanan, Briggs, and Key, Alastair

Subjects
Anthropology, FOS: Sociology
Abstract

Supplemental material, sj-doc-2-naa-10.1177_01976931221074386 for Another tool in the experimental toolbox: On the use of aluminum as a substitute for chert in North American prehistoric ballistics research and beyond by Metin I. Eren, Lawrence Mukusha, Julie Lierenz, Michael Wilson, Michelle R. Bebber, Michael Fisch, Trent True, Michael Kavaulic, Robert S. Walker, Briggs Buchanan and Alastair Key in North American Archaeologist

Published
2022
Full Text
View/download PDF

43. Living with Kin in Lowland Horticultural Societies

Author

Walker, Robert S., Beckerman, Stephen, Flinn, Mark V., Gurven, Michael, von Rueden, Chris R., Kramer, Karen L., Greaves, Russell D., Córdoba, Lorena, Villar, Diego, Hagen, Edward H., Koster, Jeremy M., Sugiyama, Lawrence, Hunter, Tiffany E., and Hill, Kim R.

Published
2013
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results