[PDF] The Relation Between Handedness For Reaching And Unimanual Handedness From 6 To 14 Months eBook

Author : Julie Campbell
Publisher :
Page : 82 pages
File Size : 49,76 MB
Release : 2015
Category : Infant psychology
ISBN :

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"Unimanual hand preference is a behavior in which one hand is used more often than the other when single-handedly manipulating objects. The progressive lateralization theory (Michel, 2002) of handedness proposes that handedness gradually concatenates during infancy as a cascade from initially a preference for contacting objects to acquiring them, to their unimanual manipulation, to the eventual emergence of a hand preference for role-differentiated bimanual manipulation (RDBM). Together, these behaviors represent the individual's handedness expressed across most manual skills. Thus, the theory posits that an early hand preference for object acquisition will predict a later preference for single-handed object manipulations. This proposal was examined by describing the development of hand-use preferences for unimanual manipulation of objects for 90 infants (57 males) tested monthly from 6 to 14 months. These 90 infants were obtained from a larger sample of 380 infants: 30 infants from a group of 45 with left hand-use preferences for acquiring objects were matched for sex and development of locomotion skills with 30 infants with a right hand-use preference and 30 with no hand preference for acquiring objects. Results showed that the frequency of unimanual manipulations is stable during the 6-14 month period. Multilevel modeling of unimanual manipulation trajectories for the three acquisition hand-preference groups revealed that hand-use preferences for unimanual manipulation become more prominent with age and the preference is predicted by the hand-use preference for object acquisition. Also, infants with a right-hand preference for object acquisition develop a hand-use preference for unimanual manipulation sooner than those with a left preference and infants without a preference for acquisition remain without a preference for manipulation."--Abstract from author supplied metadata.

Author : Iryna Babik
Publisher :
Page : 146 pages
File Size : 37,22 MB
Release : 2014
Category : Hand
ISBN :

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"Handedness development during infancy could be represented as a progressive expansion of a hand-use preference across a wider range of increasingly complex skills. The goal of the present study was to explore the development of role-differentiated bimanual manipulation (RDBM) during infancy as an expansion of the development of handedness for acquiring objects and unimanual manipulation. Infants were categorized according to their handedness status for acquiring objects (right-hand, left-hand, or no distinct hand-use preference). This status was determined from nine monthly assessments performed during 6-14 month period and resulted in a sample of 90 normally developing infants (30 right-handers, 30 left-handers, and 30 no preference infants). These infants were tested monthly from 9 to 14 months for unimanual manipulation and RDBM handedness. The results of the multilevel analyses showed that lateralization of handedness for toy acquisition increased during 6-12 month interval and decreased thereafter. Lateralization of handedness for unimanual manipulation and RDBM increased during 9-14 month period. Furthermore, handedness for toy acquisition was found to be positively related to handedness for unimanual manipulation, which, in its turn, was positively related to handedness for difficult, but not simple, RDBM. Also, handedness for toy acquisition was positively related to handedness for difficult RDBM. Thus, it was concluded that handedness for toy acquisition concatenates into unimanual handedness which further influences the development of RDBM handedness."--Abstract from author supplied metadata.

Author : Duangporn Pattanakul
Publisher :
Page : 62 pages
File Size : 47,52 MB
Release : 2018
Category :
ISBN : 9780438475403

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The cascade theory of handedness development (Michel, 1983, 2002) posits that hand preference for an earlier manual skill can concatenate into hand preference for the next manual skill. While a number of studies have examined the relation between infant handedness in two manual skills and have demonstrated that infant hand preference for an early developing manual skill cascades into a later developing manual skill, no research has focused on the relation between unimanual manipulations and role-differentiated bimanual manipulation in infancy. The current study examined the relation between unimanual manipulation and role-differentiated bimanual manipulation (RDBM) in infants across 9-14 months. Specifically, this study examined whether hand preference for unimanual manipulations predicted RDBM hand preference. Fisher's exact test was conducted to examine whether there were significant overlaps in handedness between unimanual hand preference and RDBM hand preference. A simple regression was performed to test whether unimanual z-scores predicted RDBM z-scores across 9-14 months. A repeated measures ANOVA was also conducted to examine changes in RDBM z-scores across 9-14 months in each unimanual hand preference group (right, left, no preference). The results indicated that hand preference for unimanual manipulation did not predict RDBM hand preference.

Author : Elke Kraus
Publisher : Springer Nature
Page : 297 pages
File Size : 37,51 MB
Release : 2023-08-16
Category : Medical
ISBN : 3031243897

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Handedness is a multidimensional phenomenon co-determined by polygenetic and developmental aspects, multifactorial influences and in some cases, pathological impact. It is important for professionals working with children, including those who are still undecided about their writing hand, to assess, analyse and understand the complexity of handedness comprehensively to prevent problems related to switched or atypical handedness. Beyond Left and Right Handedness uses a practice-based approach to handedness and systematically integrates theory, research and practice. Part I, ‘Theory and Research,’ critically evaluates and utilises the broad spectrum of the handedness literature as a theoretical basis for the development of handedness instruments. Part II, ‘Assessment and Analysis,’ presents diagnostic and analytical instruments developed by the author based on numerous in-depth studies and extensive clinical practice over 20 years. These include the Handedness Profile, a standardised assessment of various handedness dimensions; and the Handedness Typology, an analytical framework to interpret different types of handedness. Part III, ‘Implications for Practice,’ contains detailed case studies on assessment and treatment by professionals working with children presenting with unclear and/or atypical handedness. “This book provides the reader with a comprehensive and scholarly discussion of the topic, presenting a careful, in-depth description of all aspects of the topic and providing professionals with the necessary, evidence-based tools to address handedness in practice. It is an invaluable resource that is well situated in the latest evidence-based understanding of handedness and provides a comprehensive guide to addressing the important development of handedness.” - Prof. Dr. Helen Polatajko

Author : Claudio L. Ferre
Publisher :
Page : 79 pages
File Size : 21,16 MB
Release : 2009
Category : Child development
ISBN :

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"The clearly observable behaviors that identify infant hand-use preferences make the development of this sensorimotor form of lateralization a valuable model for evaluating the development of other forms of lateral asymmetries of function. The current study examined the relation of individual patterns of development of handedness for reaching for objects (prehension) to the emergence of handedness in role-differentiated bimanual manipulation (RDBM). RDBM requires each hand to perform different, but complementary, actions on one or more objects. Hand-use reference for reaching for and grasping objects was assessed in a sample of 85 infants from the period of 6- to 11-months of age using a validated handedness assessment that consists of a series of presentations of 34 common infant toys. At 11 and 14 months, hand-use preferences for RDBM were assessed while the infants were involved in semiplay activity in which they were presented with a series of 13 toys (20-40 s for each presentation). Results revealed no significant relationship between prehension handedness and handedness for RDBM. However, multi-level modeling of the prehension data revealed interesting developmental changes in prehension handedness that can only be identified by using monthly sampling intervals with longitudinal methods."--Abstract from author supplied metadata.

Author : Gregory Króliczak
Publisher : Frontiers Media SA
Page : 163 pages
File Size : 40,21 MB
Release : 2019-08-15
Category :
ISBN : 2889459683

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Whereas the cerebral specialization for skilled manual actions (praxis) seems closely linked to dominance for language, with both functions left lateralized in the vast majority of humans, the neural correlates of hand preference are still less well understood. Indeed, as a combination of inherited and non-inherited genomic factors (i.e., direct parental and concealed environmental contributions), handedness – in contrast to language – is less likely to have strong genetic indices and clearly lateralized functional organization. What about eye dominance, unimanual and bimanual object manipulation, and gestures, or attentional systems and the related egocentric or allocentric coding of space? Are these different categories functionally and structurally interconnected? Is their development and contribution to task performance linked, even if they are differently lateralized? How are they connected to language learning or its development? In trying to understand these relationships and their neural underpinnings we obtain a new insight into fundamental human behaviors, which depend either on shared or distinct cerebral resources that must, nevertheless, be harmonized by higher-order cerebral processing. In this Research Topic we assembled a dozen of original research contributions, as well as articles with more theoretically-driven perspectives, that directly speak to these issues. Hopefully this work will serve as a foundation for further discussions and will stimulate new research in this fascinating domain.

Author : Emily. C. Marcinowski
Publisher :
Page : 58 pages
File Size : 17,32 MB
Release : 2013
Category : Infants
ISBN :

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"Towards the end of their first year, infants are initially learning to construct objects. Construction, or merging multiple objects into a single, unifying structure, requires combining cognitive and sensorimotor abilities. Since infants with a hand preference have greater manual proficiency than infants with no hand preference, infants with a hand preference are expected to be more skilled at construction. Since some evidence suggests that females may develop motor skills more quickly than males, sex may play a role in the development of construction; however no specific predictions are made. Fifty-three infants (26 females) were brought to the lab from the ages of 6-14 months across 9 monthly visits. Infants were given a handedness task across all visits to assess their handedness, and additionally given a construction task from 10-14 months to assess their constructing skill. Using multilevel Poisson longitudinal modeling, left-handed males constructed at a significantly slower rate across 10-14 months than all other groups. Left-handed males follow a unique trajectory of constructing skill, which could indicate differences in their spatial abilities and may also affect related cognitive abilities at later ages, such as hierarchical structuring or seriation."--Abstract from author supplied metadata.

Author : Kevin J. Connolly
Publisher : Cambridge University Press
Page : 300 pages
File Size : 31,8 MB
Release : 1998-02-04
Category : Medical
ISBN : 9781898683148

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A wide-ranging and interdisciplinary overview of the hand, from its evolution to assessment of disability.