The Emergence of Language in the Hominin Lineage: Perspectives from Fossil Endocasts
نویسنده
چکیده
Since brain does not fossilize, brain endocast (i.e., replica of the inner surface of the braincase, Figure 1) constitutes the only direct evidence for reconstructing hominin brain evolution (Holloway, 1978; Holloway et al., 2004a). In this context, paleoneurology has suffered from strong limitations due to the fragmentary nature of the fossil record and the absence of any information regarding subcortical elements in extinct taxa. Additionally, variation in brain shape and organization (and in the corresponding endocast) is technically difficult to capture, as stated by Bruner (2017a, p. 64): “[...] the smooth and blurred geometry of the brain, its complex and complicated mechanisms, and its noticeable individual variability make any research associated with its morphology very entangled and difficult to develop within fixed methodological approaches.” An emblematic example might be the reluctance of paleoneurologists to consider the sulcal imprints visible on the endocranial surface because of the substantial uncertainties in describing such features in fossil specimens and related debates (e.g., the lunate sulcus in the Taung child’s endocast; Falk, 1980a, 2009, 2014; Holloway, 1981a; Holloway et al., 2004b). In 1987, Tobias even came to the conclusion that “The recognition of specific cerebral gyri and sulci from their impressions on an endocast is a taxing, often subjective and even invidious undertaking which arouses much argumentation” (p. 748). However, in conjunction with a conceptual shift toward a more comprehensive overview of hominin brain evolution (e.g., reconsideration of the “cerebral rubicon” characterizing the human brain, Falk, 1980b; Holloway, 1983), continuous discoveries of new fossil material and recent analytical developments are progressively improving and refining our knowledge about the human neural evolutionary history. In particular, paleoneurology is producing new evidence for reconstructing the timing and mode of the emergence of crucial functions, such as language.
منابع مشابه
Hominin brain evolution--new century, new directions.
The study of hominin brain evolution focuses on the interiors of fossilized braincases. Applications of recent three-dimensional computed tomography (CT) and magnetic resonance imaging (MRI) techniques for visualizing and measuring >>virtual endocasts<< from braincases in combination with advances in computer graphics and software for acquiring relevant data are transforming the way in which fo...
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عنوان ژورنال:
دوره 11 شماره
صفحات -
تاریخ انتشار 2017