Background
The influence of hippocampal connectivity on memory performance is well established in individuals with high educational attainment. However, the role of hippocampal connectivity in illiterate populations remains poorly understood.
Methods
Thirty-five illiterate adults were administered a literacy assessment (Test of Functional Health Literacy in Adults - TOFHLA), structural and resting state functional MRI and an episodic memory test (Free and Cued Selective Reminding Test). Illiteracy was defined as a TOFHLA score below 53. We evaluated the correlation between hippocampal connectivity at rest and both free recall and literacy scores.
Results
Participants were mostly female (57.1%) and Black (84.8%), with a median age of 50 years. The median TOFHLA literacy score was 28.0 [21.0;42.5] out of 100 points and the median free recall score was 30.0 [26.2;35] out of 48 points. The median gray matter volume of both the left and right hippocampi was 2.3 [2.1; 2.4] cm3. We observed a significant connectivity between both hippocampi and the precuneus and the ventral medial prefrontal cortex. Interestingly, the right hippocampal connectivity positively correlated with the literacy scores (β = 0.58, p = 0.008). There was no significant association between episodic memory and hippocampal connectivity. Neither memory nor literacy scores correlated with hippocampal gray matter volume.
Conclusions
Low literacy levels correlate with hippocampal connectivity in illiterate adults. The lack of association with memory scores might be associated with low brain reserve in illiterate adults.
A presente investigação insere-se no quadro teórico dos estudos sociointeracionistas e da pesquisa colaborativa e tem como objetivo analisar as estratégias de mediação pedagógica nas produções escritas de grupos de alunos jovens e adultos em processo de alfabetização. Foram realizadas análise e categorização das mediações ocorridas ao longo do programa de intervenção na escrita inventada (PEI) em diálogo com pesquisas desenvolvidas em Portugal e no Brasil. A pesquisa com escrita inventada é definida como uma ação que gera transformações no pensamento do alfabetizando, visto que mobiliza a sua atenção para as pautas sonoras das palavras e para a forma como pode registrá-las, e pode favorecer o processo de reflexão metalinguística implicado na aprendizagem inicial da língua escrita. O conjunto dessas interações com os sujeitos adultos demonstrou que o exercício da escrita colaborativa pode desenvolver o processo de reflexões coletivas e individuais para o desenvolvimento na apreensão da língua escrita.
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