Manual Specialization and the Developing Brain

Manual Specialization and the Developing Brain deals with how the hands acquire different skills and what this may tell about the child's developing brain. This book is organized into three parts. Part I provides a general overview of lateralization development, while Part II compiles contributions that are more theoretical in nature. The last part summarizes the empirical research with neonates. This text specifically discusses the studies of early lateralized manual behaviors, character of human handedness, and factors that contribute toward variability in lateralization. The hemisphere differences in response to specific stimulus cues, phylogenetic perspective, and infant motor skills project are also elaborated. This text likewise covers the developmental view of hemispheric specialization and changes and constancies in development. This publication is useful to pediatricians, medical practitioners, and researchers concerned with early lateralized behavior.

ContributorsPrefaceI Reviews of Lateralization Development 1 Manual Specialization and the Developing Brain: An Overview Introduction Questions Conclusions References 2 Is Early Reaching Left-Handed? Review of Manual Specialization Research Introduction Studies of Early Lateralized Manual Behaviors Discussion Conclusions References 3 Development of Hand-Use Preference During Infancy Introduction The Development of Handedness The Character of Human Handedness Antecedents of the Dextral Bias in Handedness Hypothetical Mechanisms of Biasing Allele Action Conclusions References 4 Mechanisms Underlying Instability in the Development of Hand Preference Introduction The Unstable Course of the Development of Lateral Biases in Movement The Multifactor Stochastic Model: Factors That Contribute Toward Congruency in Lateralization The Multifactor Stochastic Model: Factors That Contribute Toward Variability in Lateralization Conclusions References 5 Hemispheric Specialization in Infancy Introduction Evidence of Hemispheric Specialization Hemisphere Differences in Response to Specific Stimulus Cues Conclusions References 6 How Many Lateralities Are There? Introduction Developmental Considerations The Theorist's Problem ReferencesII Theories of Lateralization Development 7 Hemispheric Specialization Development: What (Inhibition) and How (Parents) Introduction Research on Hemispheric and Manual Specialization Development Conclusions References 8 Differentiation and Lateral Specialization in Motor Development Introduction The Phylogenetic Perspective The Ontogenetic Perspective Conclusions References 9 Unimanual Hand Preference and Duplicated Syllable Babbling in Infants Introduction Method Results Conclusions References 10 Laterality of Function in the Infant: Historical and Contemporary Trends in Theory and Research Introduction Theories of Handedness Empirical Studies of Hand Preference in Human Infants Retrospect-and Prospect References 11 Developmental Models of Hemispheric Specialization: Insights Past and Present Discussion of the Chapters Conclusions ReferenceIII Neonatal Research 12 Neonatal Reflexes: A Search for Lateral Asymmetries Introduction Method Results and Discussion Conclusion References 13 Familial Handedness, Prenatal Environmental Adversity, and Neonatal Lateral Organization Introduction Method Results Discussion References 14 Postural Orientation in Human Infants: Changes from Birth to Three Months Introduction Infant Motor Skills Project Discussion Conclusions References 15 Methods for the Quantitative Analysis of Infant Limb Movements Introduction Method Results and Discussion ReferencesIV Infant Research 16 Is There a Stage of Left-Sided Precocity During Early Manual Specialization? Introduction Method Results Discussion References 17 Hand Differences in Grasp Duration and Reaching in Two- and Five-Month-Old Infants Introduction Method Results Discussion References 18 Laterality in Manipulatory and Cognitive-Related Activity in Four- to Ten-Month-Olds Introduction Method Results Discussion References 19 Lateral Bias in Reaching and Holding at Six and Twelve Months

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