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Praxis in Left-Handers

100%

Króliczak G.

Kultura i Edukacja

2013

issue 6(99)

5-31

Neuropsychological and neuroimaging evidence convincingly implicates the left cerebral hemisphere in the representation of skilled movements (praxis) in right-handers. Compelling and consistent data on the organization of praxis in left-handed individuals has only recently started to emerge. This new evidence, again both from neuropsychology and neuroimaging, supports the notion that in left-handers the neural substrate of praxis skills is less asymmetric, i.e., it is more bilaterally organized. Up until recently, though, the neuropsychological literature on brain-damaged left-handers was often dominated by descriptions of more or less atypical cases and dissociations of functions observed in such individuals. Associations of deficits, linked to anatomic proximity rather than to a common cerebral specialization, were rarely found worth publishing and/or in-depth discussions. This paper first reviews some of the most relevant and/or well-known reports on representations of different categories of skilled manual gestures in right- and left-handers, with a view to support the idea that these skills are mediated by a common system. Then, based on neuroimaging evidence from healthy subjects, a few individuals with unusual organization of praxis are discussed. These disparate cases quite likely represent natural variation in functional asymmetries. It is yet to be determined whether the effect of a more bilateral organization of cognitive skills in this population is just due to a much higher incidence of atypical representations of functions or rather a general tendency for all left-handers to have their brains less asymmetrically organized.

Developing Dovyko I: the Czech adaptation of the MacArthur-Bates Communicative Development Inventory

72%

Jarůšková L., Sloupová T., Smolík F., Chládková K., Oceláková Z., Paillereau N.

Československá psychologie (Czechoslovak Psychology)

2024

vol. 68

issue 2

174-185

Objectives. This article reports on the adaptation procedure of the MacArthur-Bates Communicative Development Inventory (MB-CDI): Words & Gestures into Czech. The parental-report questionnaire screens communicative development in infants aged 8 to 18 months and focuses on general communicative skills, active and passive vocabulary, and communicative gestures. The content of the Czech adaptation needs to reflect the communicative practices specific to the Czech language and cultural environment. Methods. The final item list for the questionnaire was developed by combining a variety of methods including translations, parental diaries from 44 caregivers, an expert focus group, and a corpus survey. The preliminary questionnaire was piloted in two rounds, altogether in 95 Czech caregivers and 100 children. Preliminary content was drawn from translations and parental diaries. These items were reduced based on assessment of child-development experts and frequency in four Czech-language corpora. Item analysis was conducted after each of the pilot rounds to remove from the final content words or gestures which were infrequently checked. Conclusions. This process assured that the Czech CDI screens communicative development on items relevant to the Czech linguistic and social landscape. As such, Dovyko I offers a powerful tool to measure communicative development in local children and may also find use in research of children with different developmental and linguistic characteristics. Limitations. The questionnaire is designed as a complement to other existing methods of communicative screening. The tool thus does not serve for final diagnosis but may help indicate an area problematic for the child or motivate further medical, cognitive, or linguistic assessment. The norming, validity, and reliability studies, which have been completed with Czech-speaking families, are not described in this article but separately in the tool’s manual.

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1 Kultura i Edukacja

1 Československá psychologie (Czechoslovak Psychology)

1 Chládková K.

1 Jarůšková L.

1 Króliczak G.

1 Oceláková Z.

1 Paillereau N.

1 Sloupová T.

1 Smolík F.

1 2024

1 2013

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Praxis in Left-Handers

Developing Dovyko I: the Czech adaptation of the MacArthur-Bates Communicative Development Inventory