Critical Flicker Frequency in X-Chromosome Linked Dichromats

Lutze, Margaret; Smith, Vivianne C.; Pokorny, Joel

doi:10.1007/978-94-009-2695-0_6

Cited by 6 publications

(4 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Our experimental design controlled the adaptation level of the rods and cones, and all modulations were evaluated at the same time-average chromaticity and rod excitation level. The measured L-and M-cone CFFs were consistent with CFF differences between protanopes and deutera-nopes~Pokorny & Smith, 1972;Lutze et al, 1989!. Third, the suppressive rod-cone interaction was not statistically significant for the S-cone modulations. It is known from physiological studies that KC-pathway units respond vigorously to S-cone and luminance-containing modulations~Yeh et al, 1995!…”

Section: Discussionsupporting

confidence: 65%

Dark-adapted rod suppression of cone flicker detection: Evaluation of receptoral and postreceptoral interactions

2006

Self Cite

View full text Add to dashboard Cite

Dark-adapted rods in the area surrounding a luminance-modulated field can suppress flicker detection. However, the characteristics of the interaction between rods and each of the cone types are unclear. To address this issue, the effect that dark-adapted rods have on specific classes of receptoral and postreceptoral signals was determined by measuring the critical fusion frequencies~CFF! for receptoral L-, M-, and S-cone and postreceptoral luminancẽ @LϩMϩS# and @LϩMϩSϩRod#! and chromatic~@L0~LϩM!# ! signals in the presence of different levels of surrounding rod activity. Stimuli were generated with a two-channel photostimulator that has four primaries for a central field and four primaries for the surround, allowing independent control of rod and cone excitation. Measurements were made either with adaptation to the stimulus field after dark adaptation or during a brief period following light adaptation. The results show that dark-adapted rods maximally suppressed the CFF by ;6 Hz for L-cone, M-cone, and luminance modulation. Dark-adapted rods, however, did not significantly alter the S-cone CFF. The @L0~LϩM!# postreceptoral CFF was slightly suppressed at higher surround illuminances, that is, higher than surround luminances resulting in suppression for L-cone, M-cone, or luminance modulation. We conclude that rod-cone interactions in flicker detection occurred strongly in the magnocellular pathway.

show abstract

Section: Discussionsupporting

confidence: 65%

Dark-adapted rod suppression of cone flicker detection: Evaluation of receptoral and postreceptoral interactions

2006

Self Cite

View full text Add to dashboard Cite

show abstract

“…This suppression of temporally modulated sinusoidal stimuli seems to occur in a spatial frequency range of 1–2 c/° ( Lange et al, 1997 ). The mesopic L- and M-cone CFFs in trichromatic observers ( Cao et al, 2006 ) are also consistent with differences in CFF between protanopes and deuteranopes ( Smith and Pokorny, 1972 ; Lutze et al, 1989 ). That cone CFF at high mesopic light levels is suppressed by dim equiluminant surrounds (≤0.2 Td) that promote rod activity is consistent with the involvement of inhibitory signals from the AII amacrine cell directly to either cone bipolar cells or ganglion cells ( Cao and Lu, 2012 ) and is strong in the MC-pathway ( Cao et al, 2006 ).…”

Section: Rod–cone Interactions In Temporal Processingsupporting

confidence: 67%

Vision under mesopic and scotopic illumination

2015

View full text Add to dashboard Cite

Evidence has accumulated that rod activation under mesopic and scotopic light levels alters visual perception and performance. Here we review the most recent developments in the measurement of rod and cone contributions to mesopic color perception and temporal processing, with a focus on data measured using a four-primary photostimulator method that independently controls rod and cone excitations. We discuss the findings in the context of rod inputs to the three primary retinogeniculate pathways to understand rod contributions to mesopic vision. Additionally, we present evidence that hue perception is possible under scotopic, pure rod-mediated conditions that involves cortical mechanisms.

show abstract

“…Esta técnica tem uma desvantagem, pois a mudança da luminância média de uma das luzes provoca a alteração do estado de adaptação no olho. Uma forma de evitar este problema é a fotometria de modulação heterocromática (Smith & Lutze, 1989). Neste método a luminância média não sofre variação o que varia é a proporção de contraste de cada luz .…”

Section: O Protocolo Erg De Flicker Heterocromático (Do Inglêsunclassified

“…A related method that evades this problem is heterochromatic modulation photometry Pokorny, Smith, & Lutze, 1989). In this method, the mean luminance of the two stimuli is fixed but the ratio of their contrasts is varied.…”

Section: Introductionmentioning

confidence: 99%

Avaliação das vias do sistema visual por eletrorretinograma e testes psicofísicos na Distrofia Muscular de Duchenne e na Diabetes Mellitus tipo 1

Martins¹

View full text Add to dashboard Cite

Critical Flicker Frequency in X-Chromosome Linked Dichromats

Cited by 6 publications

References 4 publications

Dark-adapted rod suppression of cone flicker detection: Evaluation of receptoral and postreceptoral interactions

Dark-adapted rod suppression of cone flicker detection: Evaluation of receptoral and postreceptoral interactions

Vision under mesopic and scotopic illumination

Avaliação das vias do sistema visual por eletrorretinograma e testes psicofísicos na Distrofia Muscular de Duchenne e na Diabetes Mellitus tipo 1

Contact Info

Product

Resources

About