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Trippelkodmodellen: hur barnhjärnor hanterar numeriska uppgifter
Linköping University, Department of Computer and Information Science.
2019 (Swedish)Independent thesis Basic level (degree of Bachelor), 12 credits / 18 HE creditsStudent thesis
Abstract [sv]

Att kunna uppskatta antal är en grundläggande förmåga som återfinns hos många djur förutom männinskan. Trippelkodmodellen (TKM) för numerisk kognition säger att antal representeras på tre olika sätt, som (arabiska) siffror, som sifferord och som ickesymboliska magnituder, vilka associeras till separata, men delvis överlappande, neurala substrat. Denna studie undersökte för första gången alla tre koder samtidigt på barn. 10 barn mellan 10-12 år genomgick fMRT-skanning för att söka neurala korrelat till antalsuppfattning. Oberoende uppgift > kontroll-kontraster bekräftade delvis TKM, såsom funktionellt olika neurala substrat, ett fronto-parietalt nätverk och att barn nyttjar det ventrala uppmärksamhetsnätet mer än vuxna på grund av mindre automatisering. Därtill fanns aktiveringar i visuella områden V2 och V3 liksom i primära somatosensoriska området vilket överensstämmer med föreslagna kompletteringar av TKM. Parametriska kontraster kunde i viss mån bekräfta distanseffekten som innebär större kognitiv belastning vid särskiljning av närliggande antal jämfört med att skilja på tydligt olika antal.

Abstract [en]

Being able to approximate numbers is a basic skill present in many animals, including man. The Triple Code Model (TCM) of numerical cognition suggests that numerosity is represented in three different codes, each subserved by functionally dissociated, but partly overlapping, neural substrates. The codes are (arabic) numbers, number words, and non-symbolic magnitude. This study examined all three codes in children for the first time. 10 healthy children, 10-12 years old, had an fMRI in order to detect neural correlates to numerosity processing. Independent task-control contrasts partly confirmed the TCM as functionally dissociated neural substrates, with a fronto-parietal network and the fact that children, having automatized functions less, more heavily depends on the ventral attention network. Furthermore, activations in the visual areas V2 and V3 as well as in primary somatosensory cortex is in accordance with recent suggestions of updates to the TCM. Parametric contrasts did, to some extent, confirm the distance effect, where it is more difficult to discriminate closely spaced numbers than numbers of more different magnitude.

Place, publisher, year, edition, pages
2019. , p. 46
National Category
Neurosciences
Identifiers
URN: urn:nbn:se:liu:diva-157455ISRN: LIU-IDA/KOGVET-G--19/006--SEOAI: oai:DiVA.org:liu-157455DiVA, id: diva2:1324061
Subject / course
Cognitive science
Supervisors
Examiners
Available from: 2019-06-13 Created: 2019-06-13 Last updated: 2019-06-13Bibliographically approved

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CiteExportLink to record
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