Throughout the twentieth century, neuronal researchers knew the adult human brain to be a thoroughly fixed and immutable cellular structure, devoid of any developmental potential. <I>Plastic Reason</I> is a study of the efforts of a few Parisian neurobiologists to overturn this rigid conception of the central nervous system by showing that basic embryogenetic processes—most spectacularly the emergence of new cellular tissue in the form of new neurons, axons, dendrites, and...
