Response to Comment on "The Brain of LB1, Homo floresiensis"
Dean Falk1*,
Charles Hildebolt2,
Kirk Smith2,
M. J. Morwood3,
Thomas Sutikna4,
Jatmiko4,
E. Wayhu Saptomo4,
Barry Brunsden2 and
Fred Prior2
1 Department of Anthropology, Florida State University, Tallahassee, FL 32306, USA.
2 Mallinckrodt Institute of Radiology, Washington University School of Medicine, St. Louis, MO 63110, USA.
3 Archaeology and Palaeoanthropology, University of New England, Armidale, New South Wales 2351, Australia.
4 Indonesian Centre for Archaeology, JI. Raya Condet Pejaten No. 4, Jakarta 12001, Indonesia.
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Fig. 1. Cranial capacity in cubic centimeters as a percentage of body weight in grams (RBS, relative brain size) plotted against body weight (kg) for humans and apes (10). Indices (i) describe apelike RBS (i = 1) and RBS that are twice (i = 2) and three times (i = 3) those expected for apes of equivalent body weights. Congo pygmies are placed on the human curve at their mean body weights of 42 kg and 48 kg for 319 women and 405 men, respectively (11). The curve for H. erectus is hypothetical because it is based on data showing that i = 2 from only one available skeleton (KNM-WT 15000). Estimated juvenile and adult weights for WT 15000 are 48 kg and 68 kg, respectively, and juvenile and adult cranial capacities are 880 and 909 cm3, respectively (12). LB1's cranial capacity of 417 cm3 places it on or near the ape curve at its minimum, mean, and maximum body weight estimates (16 to 36 kg, mean 26 kg) (9), which is consistent with data from australopithecines. Figure and legend from figure S1 in (2).
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