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This longitudinal preprint studied how manipulation complexity (MC)—fine-grained differences in infant object exploration such as finger combinations, hand roles, and deconstruction of object parts—develops across the first year of life in 90 typically developing infants assessed every six months from 9 to 14 months using a battery of eight objects. Using Guttman analyses, the authors found MC is cumulative, with infants capable of the most complex manipulation only if they also show all lower-ranked manipulation skills. The inferred complexity order was bimanual manipulation, then bimanual manipulation with distinct roles for each hand, then object deconstruction, and finally independent digit movement. A major caveat is that the work is presented as a preprint and is not peer reviewed, with preliminary data. The paper does not explicitly discuss endometriosis or adenomyosis; it was included in the corpus via a keyword match in the upstream search index.
Abstract
Infant object exploration affords rich opportunities for learning across the first years of life. During object play, infants use different combinations of fingers, different roles for each hand, and will deconstruct object parts—these fine-grained differences comprise the construct manipulation complexity (MC). In this paper, we characterized the development of MC in a longitudinal design. Ninety typically developing infants were assessed for MC at six monthly visits from 9-14 months of age from a battery of eight objects. Guttman analyses found that MC is cumulative, meaning that infants can do the most complex manipulation skill if they are able to also do all the lower ranked manipulation skills. The order from least complex to most complex was: (1) bimanual manipulation, (2) bimanual manipulation with distinct roles for each hand, (3) object deconstruction, and (4) independent digit movement. These results introduce a new framework for describing fine motor skills involved in infant manipulation.
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Manipulation Complexity in Infancy | Authorea try { document.documentElement.classList.add('js'); } catch (e) { } var _gaq = _gaq || []; _gaq.push(['_setAccount', 'G-8VDV14Y67G']); _gaq.push(['_trackPageview']); (function() { var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true; ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js'; var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s); })(); Skip to main content Preprints Collections Wiley Open Research IET Open Research Ecological Society of Japan All Collections About About Authorea FAQs Contact Us Quick Search anywhere Search for preprint articles, keywords, etc. Search Search ADVANCED SEARCH SCROLL Infant and Child Development: prenatal, childhood, adolescence, emerging adulthood This is a preprint and has not been peer reviewed. Data may be preliminary. 22 January 2025 V1 Latest version Share on Manipulation Complexity in Infancy Authors : Kaityn Contino 0000-0002-6104-5339 [email protected] and Eliza Nelson 0000-0003-0058-8409 Authors Info & Affiliations https://doi.org/10.22541/au.173758207.74293351/v1 288 views 138 downloads Contents Abstract Supplementary Material Information & Authors Metrics & Citations View Options References Figures Tables Media Share Abstract Infant object exploration affords rich opportunities for learning across the first years of life. During object play, infants use different combinations of fingers, different roles for each hand, and will deconstruct object parts—these fine-grained differences comprise the construct manipulation complexity (MC). In this paper, we characterized the development of MC in a longitudinal design. Ninety typically developing infants were assessed for MC at six monthly visits from 9-14 months of age from a battery of eight objects. Guttman analyses found that MC is cumulative, meaning that infants can do the most complex manipulation skill if they are able to also do all the lower ranked manipulation skills. The order from least complex to most complex was: (1) bimanual manipulation, (2) bimanual manipulation with distinct roles for each hand, (3) object deconstruction, and (4) independent digit movement. These results introduce a new framework for describing fine motor skills involved in infant manipulation. Supplementary Material File (infants and mc_transferblinded_maindocument.docx) Download 230.12 KB Information & Authors Information Version history V1 Version 1 22 January 2025 Copyright This work is licensed under a Non Exclusive No Reuse License. Collection Infant and Child Development: prenatal, childhood, adolescence, emerging adulthood Keywords fine motor skills guttman infants manipulation object exploration Authors Affiliations Kaityn Contino 0000-0002-6104-5339 [email protected] Boston University View all articles by this author Eliza Nelson 0000-0003-0058-8409 Florida International University View all articles by this author Metrics & Citations Metrics Article Usage 288 views 138 downloads .FvxKWukQNSOunydq8rnd { width: 100px; } Citations Download citation Kaityn Contino, Eliza Nelson. Manipulation Complexity in Infancy. Authorea . 22 January 2025. DOI: https://doi.org/10.22541/au.173758207.74293351/v1 If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download. For more information or tips please see 'Downloading to a citation manager' in the Help menu . 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