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    Wyświetlanie 1-2 z 2
    Tytuł:
    Atypical Organization of Praxis and Language: A Look Back
    Autorzy:
    Króliczak, Grzegorz
    Buchwald, Mikołaj
    Klichowski, Michał
    Nowik, Agnieszka M.
    Piper, Brian J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2124331.pdf
    Data publikacji:
    2022-02-12
    Wydawca:
    Katolicki Uniwersytet Lubelski Jana Pawła II. Towarzystwo Naukowe KUL
    Tematy:
    tool use gestures
    verbal fluency
    hand dominance
    interrelations
    functional asymmetries
    lateralization
    segregation
    dissociation
    Opis:
    Atypical representations of praxis and language were studied in two forms and combinations: bilateral organization, and right lateralization, independently for each function; when the atypically represented praxis dissociates from typically lateralized language; and when both praxis and language have atypical forms. Direct differences between bilateral and right-lateralized representations were either marginal (for praxis), or nonexistent (for language). Because atypical organization of praxis is over twice as frequent as language in its atypical form, sample size might be an issue only for the latter (as atypical organization of language is very rare). Group averages in their dissociations, and associations in atypical forms, revealed the expected representations of the two functions. These outcomes indicate that merging the two atypical representations of praxis, or language, into one atypical group can reveal the critical aspects of their atypicality, including subcortical contributions, without seriously impeding correct interpretation of the essential underlying neural mechanisms.
    Źródło:
    Roczniki Psychologiczne; 2021, 24, 3-4; 325-343
    1507-7888
    Pojawia się w:
    Roczniki Psychologiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Praxis and language organization in left-handers
    Autorzy:
    Króliczak, Grzegorz
    Piper, Brian J
    Potok, Weronika
    Buchwald, Mikołaj
    Kleka, Paweł
    Przybylski, Łukasz
    Styrkowiec, Piotr P
    Powiązania:
    https://bibliotekanauki.pl/articles/2106006.pdf
    Data publikacji:
    2020-03-10
    Wydawca:
    Fundacja Edukacji Medycznej, Promocji Zdrowia, Sztuki i Kultury Ars Medica
    Tematy:
    tool use gestures
    verbal fluency
    lateralization
    interrelations
    asymmetries
    segregation of functions
    functional dissociations
    Opis:
    The performance of learned manual gestures (praxis) and the production of speech are thought to depend on related neural processes. If this relationship is not invoked by an unknown, third variable then shifts in their laterality, including dissociations of these two functions, would be unlikely unless the sharing of some neural resources with other functions is advantageous. This could be the case in lefthanders, in whom actions requiring manual precision are controlled by their right hemispheres, and whose representations could attract the control of skilled gesture. Functional neuroimaging (fMRI) was used to study praxis and language functions. Their lateralization indices were measured in 56 consecutively tested lefthanders (28 females), with the mean age of 23.3±4.9 years (range 18.4 – 47 years), and an Edinburgh Handedness Inventory quotient between –100 and –55.6 (with the mean of –83.8±14.2). We show that atypical, bilateral organization or right-lateralization of praxis is more common than atypical organization/lateralization of language, observed, respectively, in 23 (41%) vs. 15 (26.8%) of cases. Specifically, we found: (a) seven cases (12.5%) of clear, and an additional three cases (5.4%) of less pronounced dissociations of atypically represented praxis from typically represented language; (b) 13 cases (23.2%) with atypically organized praxis also associated with atypically organized language, and (c) only two cases (3.6%) of rather strongly atypical lateralization of language, yet with quite typical lateralization of praxis. These outcomes are consistent with an idea that, in some lefthanders, the guidance of skilled manual actions can profit from tighter links with the right hemisphere, whose motor specialization is linked in this particular population to manual precision, but in general to attentional resources, visuo-spatial processing and even bimanual coordination. Because of the presumed links of praxis with productive language, such transfers are often, and unsurprisingly accompanied by the reorganization of the latter. Yet, the very rare cases of reversed language functions, without any pronounced shifts in representations of praxis, indicate that such a pattern of segregation – or inverse dissociation – of these two functions could be maladaptive.
    Źródło:
    Acta Neuropsychologica; 2020, 18(1); 15-28
    1730-7503
    2084-4298
    Pojawia się w:
    Acta Neuropsychologica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-2 z 2

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