1,721,441 research outputs found
Piloting the software SonaPolygonals_1.0: A didactical proposal for the GCD
Full text linkIn the paper we present a didactic unit designed within a research project on
Arithmetics. The unit objective is to introduce the notion of the Greatest
Common Divisor through sona, sand drawings from African culture, and their
representation by an appropriate software. A brief description of the project
framework, the practice of the sona and the guidelines of the didactic
proposal, as well as a sketch of the main characteristics of the
SonaPolygonals_1.0 software are presented. The first findings of a pilot
project at a few second grade lower seecondary schools in Italy will be also
discussed in the DG15
The axon initial segment as a possible determinant of retinal ganglion cell dendritic geometry
No full textIn wholemounted retinae of cat, rat and monkey, in which ganglion cells were retrogradely labelled with horseradish peroxidase, a quantitative analysis of the direction of the axon initial segment with respect to the optic disc and of the relationship between the axon initial segment and the direction and distribution of primary dendrites was performed on the class of largest ganglion cells. The results show the following. (1) In all 3 species, the majority of primary dendrites of ganglion cells are directed away from the axon initial segment. (2) Primary dendrites arise with a greater frequency from the region of the cell body opposite to the axon initial segment than close to it. (3) In cat the direction of the axon initial segments show less variance in their initial direction with respect to the optic disc than in rat or monkey. In adult cats the nucleus of α-ganglion cells occupies a central position. In the kitten the position of the nucleus is eccentric and lies in a part of the cell body opposite to the axon initial segment. The nucleus moves to a central position over the next 3 weeks. The position of the axon initial segment is discussed as a possible determinant of ganglion cell dendritic geometry.</p
Interazioni binoculari nella corteccia striata di gattini strabici privati dell'esperienza visiva
No full text
Neurotrophins and plasticity in the visual cortex
No full textThe visual cortex is one of the favorite models for the study of experience-dependent changes in neuronal structure and function. A number of recent investigations indicate that the neurotrophic factors of the nerve growth factor family (neurotrophins) play a pivotal role in visual cortical plasticity. Neurotrophins and their receptors are present in the cortex during the critical period for plasticity, and neurotrophin levels are regulated by electrical activity. Neurotrophins modulate synaptic transmission and patterns of neuronal connectivity in the cortex. This review summarizes the in vivo and in vitro data that demonstrate the involvement of neurotrophins in visual cortical plasticity and discusses the possible mechanisms of their action
Difficoltà in algebra: un intervento di recupero, Parte Prima
No full textAbstract.
L’articolo presenta alcuni risultati emersi da una sperimentazione svoltasi in classi del primo biennio della scuola secondaria superiore. Lo studio aveva come scopo verificare l’efficacia di un intervento didattico di recupero per allievi che presentavano difficoltà nel calcolo letterale.
L’intervento era centrato sull’uso del software didattico APLUSIX . L’analisi dei dati mostra l’efficacia dell’intervento non tanto e non solo in relazione al significativo diminuire degli errori, ma soprattutto in relazione al miglioramento in termini di autostima, controllo e consapevolezza degli studenti. In questo articolo, si discute questo secondo aspetto nel quadro più generale degli interventi di recupero a livello metacognitivo
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