Published online by Cambridge University Press: 22 September 2009
Connection: Brain, language, and other human capacities develop in patterns shaped by both evolution and culturally defined experiences, including language and literacy. New tools for characterizing brain development provide means for analyzing development of different brain regions in relation to abilities such as speech and reading. Many classical neural imaging techniques assess the volume of particular brain regions in brains of people who have died, but newer techniques, such as magnetic resonance imaging, assess volume in brains of living people. Because volumes of different brain tissues change in diverse ways when people die, the new techniques provide the first good data on brain volume of living brains. Many hypotheses about learning disorders involve differences in size of specific areas of brain tissue, such as regions for phonological analysis in many dyslexic children (Galaburda & Sherman; Paré-Blagoev; Benes & Paré-Blagoev, this volume). With data on volume in living brains being so recent, the principles relating brain volume to development, learning, and evolution remain to be determined. Evidence has already shown that different people show different volumes for the same brain areas, and that areas which share functioning seem to covary in their volume, even when they are in widely separated brain regions.
The EditorsThere appear to be powerful constraints selected through evolution that act to set the total volume of neocortex to a narrow species-specific value (Filipek et al., 1994; Caviness et al., 1999). Within these constraints other mechanisms, operating through individual experience, adaptively modulate the volumes of specific brain regions.
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