M- and L-cones in early infancy: II. Action spectra at 8 weeks of age

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M- and L-cones in early infancy: II. Action spectra at 8 weeks of age

Field sensitivities were measured under conditions of M- and L-cone isolation for seven infants (8-12 weeks-old) and two adults, using silent-substitution and the visually evoked potential (VEP). The efficacy of the receptor-isolation conditions were first verified by measuring psychophysical and VEP-derived action spectra from two color-normal adults under conditions of M- and L-cone isolation...

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M- and L-cones in early infancy: I. VEP responses to receptor-isolating stimuli at 4- and 8-weeks of age

A silent-substitution technique combined with measures of the visually-evoked potential (VEP) was used to determine whether M- and L-cones are functional in early infancy. Data were successfully collected from twenty six infants in response to three receptor-isolation conditions (rod, M- and L-cone isolation) and a luminance-modulation condition. The efficacy of the receptor-isolation condition...

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Spectra of human L cones

Variations in the amino acid sequences of the human cone opsins give rise to spectrally variant subtypes of L and M cone pigments even in the population with normal color vision. In vitro mutagenesis studies have shown that a limited number of amino acid substitutions produce shifts in the wavelength sensitivity. Presented here are results comparing electrophysiological measurements of single h...

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M- and L-cones in early infancy: III. Comparison of genotypic and phenotypic markers of color vision in infants and adults

Genetic analyses were performed on five male children (approximately 3 years), two suspect color-normals and three suspects for congenital color vision deficiencies. These classifications were based on visually-evoked potential (VEP) responses to M- and L-cone-isolating stimuli obtained in a previous study when each subject was either 4- or 8-weeks old. The present analyses were performed in a ...

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Reconstruction of early Neolithic/Bronze Age population diversity in the Shamanka II cemetery at Lake Baikal using mtDNA polymorphism

Mitochondrial deoxyribonucleic acid (mtDNA) polymorphisms were examinedin bone samples of individuals buried inan early Neolithic (c. 5800–4900 BCE) hunter-gatherer cemetery, Shamanka II, located atthe southwestern tip of Lake Baikal, Siberia. The mainobjective was to compare the mtDNA polymorphisms observed at Shamanka II to those previously reportedfrom the Lokomotiv (early Neolithic) and Ust...

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ژورنال

عنوان ژورنال: Vision Research

سال: 1998

ISSN: 0042-6989

DOI: 10.1016/s0042-6989(97)00384-2