Partial support to the authors during preparation of this manuscript was provided by grants from NINDS "Center for the Study of the Neural Bases of Language" (NS-223-43-06A1), and NIDCD "Program Project: Origins of Communication Disorders" (PO1-DC01289), and by a grant from the John D. and Catherine T. MacArthur Foundation, Research Network on Early Childhood Transitions. Portions of this chapter have appeared in Bates, E., McDonald, J., MacWhinney, B. & Appelbaum , "M.: A maximum likelihood procedure for the analysis of group and individual data in aphasia research", Brain and Language, 40, 231-265 ( 1991), and in Bates E., Appelbaum M. & Allard L.: Statistical constraints on the use of single cases in neuropsychological research, Brain and Language, 40, 295-329, ( 1991).
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