Artigo de periodico

Psychophysical analysis of contrast processing segregated into magnocellular and parvocellular systems in asymptomatic carriers of 11778 Leber's hereditary optic neuropathy (2008)

• Authors:
  • Gualtieri, Mirella
  • Bandeira, M
  • Hamer, R. D
  • Costa, Marcelo Fernandes da
  • Oliveira, A. G. F
  • Moura, A. L. A
  • Sadun, F
  • De Negri, A. M
  • Berezovsky, A - Universidade Federal de São Paulo (UNIFESP)
  • Salomão, S. R
  • Carelli, V
  • Sadun, A. A
  • Ventura, Dora Selma Fix
• USP affiliated authors: COSTA, MARCELO FERNANDES DA - IP ; VENTURA, DORA SELMA FIX - IP
• Unidade: IP
• DOI: 10.1017/s0952523808080747
• Subjects: DOENÇAS HEREDITÁRIAS; OFTALMOPATIAS; ACUIDADE VISUAL; ELETROFISIOLOGIA
• Language: Inglês
• Abstract: We examined achromatic contrast discrimination in asymptomatic carriers of 11778 Leber‘s hereditary optic neuropathy (LHON 18 controls) and 18 age-match were also tested. To evaluate magnocellular (MC) and Parvocellular (PC) contrast discrimination, we used a version of Pokorny and Smith's (1997) pulsed/steady-pedestal paradigms (PPP/SPP) thought to be detected via PC and MC pathways, respectively. A luminance pedestal (four 1° × 1° squares) was presented on a 12 cd/m2 surround. The luminance of one of the squares (trial square, TS) was randomly incremented for either 17 or 133 ms. Observers had to detect the TS, in a forced-choice task, at each duration, for three pedestal levels: 7, 12, 19 cd/m2. In the SPP, the pedestal was fixed, and the TS was modulated. For the PPP, all four pedestal squares pulsed for 17 or 133 ms, and the TS was simultaneously incremented or decremented. We found that contrast discrimination thresholds of LHON carriers were significantly higher than controls' in the condition with the highest luminance of both paradigms, implying impaired contrast processing with no evidence of differential sensitivity losses between the two systems. Carriers’ thresholds manifested significantly longer temporal integration than controls in the SPP, consistent with slowed MC responses. The SPP and PPP paradigms can identify contrast and temporal processing deficits in asymptomatic LHON carriers, and thus provide an additional tool for earlydetection and characterization of the disease
• Imprenta:
  • Publisher place: New York
  • Date published: 2008
• Source:
  • Título do periódico: Visual Neuroscience
  • ISSN: 1469-8714
  • Volume/Número/Paginação/Ano: v. 25, n. 3, p. 469-474, 2008

Informações sobre o DOI: 10.1017/s0952523808080747 (Fonte: oaDOI API)
• Este periódico é de assinatura
• Este artigo é de acesso aberto
• URL de acesso aberto
• Cor do Acesso Aberto: bronze

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How to cite

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• ABNT

  GUALTIERI, Mirella et al. Psychophysical analysis of contrast processing segregated into magnocellular and parvocellular systems in asymptomatic carriers of 11778 Leber's hereditary optic neuropathy. Visual Neuroscience, v. 25, n. 3, p. 469-474, 2008Tradução . . Disponível em: https://doi.org/10.1017/s0952523808080747. Acesso em: 19 abr. 2024.

• APA

  Gualtieri, M., Bandeira, M., Hamer, R. D., Costa, M. F. da, Oliveira, A. G. F., Moura, A. L. A., et al. (2008). Psychophysical analysis of contrast processing segregated into magnocellular and parvocellular systems in asymptomatic carriers of 11778 Leber's hereditary optic neuropathy. Visual Neuroscience, 25( 3), 469-474. doi:10.1017/s0952523808080747

• NLM

  Gualtieri M, Bandeira M, Hamer RD, Costa MF da, Oliveira AGF, Moura ALA, Sadun F, De Negri AM, Berezovsky A, Salomão SR, Carelli V, Sadun AA, Ventura DSF. Psychophysical analysis of contrast processing segregated into magnocellular and parvocellular systems in asymptomatic carriers of 11778 Leber's hereditary optic neuropathy [Internet]. Visual Neuroscience. 2008 ; 25( 3): 469-474.[citado 2024 abr. 19 ] Available from: https://doi.org/10.1017/s0952523808080747

• Vancouver

  Gualtieri M, Bandeira M, Hamer RD, Costa MF da, Oliveira AGF, Moura ALA, Sadun F, De Negri AM, Berezovsky A, Salomão SR, Carelli V, Sadun AA, Ventura DSF. Psychophysical analysis of contrast processing segregated into magnocellular and parvocellular systems in asymptomatic carriers of 11778 Leber's hereditary optic neuropathy [Internet]. Visual Neuroscience. 2008 ; 25( 3): 469-474.[citado 2024 abr. 19 ] Available from: https://doi.org/10.1017/s0952523808080747

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