Efeitos do envelhecimento no contraste visual de grades senoidais

Maria José Nunes Gadelha, Joenilton Saturnino Cazé da Silva, Jandilson Avelino da Silva, Michael Jackson de Oliveira Andrade, Débora Najda de Medeiros Viana, Natanael Antonio dos Santos

Resumo


O objetivo desse estudo foi comparar as curvas de sensibilidade ao contraste de adultos e idosos. Foi medida a FSC para grades senoidais verticais utilizando o método psicofísico da escolha forçada (2AFC). Participaram desse estudo 18 adultos com idade entre 20 e 29 anos e 18 idosos com idade entre 60 a 69 anos, de ambos os sexos. A ANOVA mostrou efeito principal entre os grupos [F(1, 156) = 173,160; p < 0,001] e de interação entre as frequências espaciais e a idade [F(3,427) = 163,365; p < 0,001]. Já o teste Bonferroni mostrou diferenças significantes em todas as frequências testadas (p < 0,001). Verificou-se que o padrão da curva de SC se mantém com o envelhecimento, com a menor sensibilidade localizada nos extremos da curva e a maior sensibilidade localizada próxima ao centro da curva. Além disso, sugere-se alterações no processo senso perceptivo visual ao longo da vida.


Palavras-chave


Método psicofísico; Percepção; Contraste visual; Envelhecimento

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Referências


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DOI: http://dx.doi.org/10.15448/1980-8623.2016.3.22748

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