Influence of background size, luminance and eccentricity on different adaptation mechanisms

Autor: Juan A. Aparicio, Pablo Alejandro Barrionuevo, Beatriz M. Matesanz, Luis Issolio, I. Arranz, Alejandro H. Gloriani, Santiago Mar
Rok vydání: 2016
Předmět:
Adult
CIENCIAS MÉDICAS Y DE LA SALUD
Mesopic vision
media_common.quotation_subject
Rod-Cone Interaction
Neurociencias
Mesopic Vision
Retinal Gain Control
Adaptation (eye)
Signal-To-Noise Ratio
Summation
Luminance
Article
050105 experimental psychology
Psicofísica
03 medical and health sciences
0302 clinical medicine
Optics
Psychophysics
Humans
Contrast (vision)
Photon noise
0501 psychology and cognitive sciences
Adaptación visual
Eccentricity (behavior)
Lighting
media_common
Physics
Visual adaptation
Adaptation
Ocular
business.industry
2209.15 Optometría
05 social sciences
purl.org/becyt/ford/3.1 [https]
Sensory Systems
Medicina Básica
Ophthalmology
Sensory Thresholds
purl.org/becyt/ford/3 [https]
Ruido de fotones
Visual Fields
Photon Noise
business
Light Adaptation
030217 neurology & neurosurgery
Photoreceptor Cells
Vertebrate
Photopic vision
Zdroj: UVaDOC. Repositorio Documental de la Universidad de Valladolid
instname
CONICET Digital (CONICET)
Consejo Nacional de Investigaciones Científicas y Técnicas
instacron:CONICET
ISSN: 0042-6989
DOI: 10.1016/j.visres.2016.04.008
Popis: Producción Científica
Mechanisms of light adaptation have been traditionally explained with reference to psychophysical experimentation. However, the neural substrata involved in those mechanisms remain to be elucidated. Our study analyzed links between psychophysical measurements and retinal physiological evidence with consideration for the phenomena of rod-cone interactions, photon noise, and spatial summation. Threshold test luminances were obtained with steady background fields at mesopic and photopic light levels (i.e., 0.06–110 cd/m2) for retinal eccentricities from 0° to 15° using three combinations of background/test field sizes (i.e., 10°/2°, 10°/0.45°, and 1°/0.45°). A two-channel Maxwellian view optical system was employed to eliminate pupil effects on the measured thresholds. A model based on visual mechanisms that were described in the literature was optimized to fit the measured luminance thresholds in all experimental conditions. Our results can be described by a combination of visual mechanisms. We determined how spatial summation changed with eccentricity and how subtractive adaptation changed with eccentricity and background field size. According to our model, photon noise plays a significant role to explain contrast detection thresholds measured with the 1/0.45° background/test size combination at mesopic luminances and at off-axis eccentricities. In these conditions, our data reflect the presence of rod-cone interaction for eccentricities between 6° and 9° and luminances between 0.6 and 5 cd/m2. In spite of the increasing noise effects with eccentricity, results also show that the visual system tends to maintain a constant signal-to-noise ratio in the off-axis detection task over the whole mesopic range.
Ministerio de Economía, Industria y Competitividad (grant FIS2011-22871)
Dirección General de Tráfico (grant SPIP20141271)
Junta de Castilla y León (grant VA005A11-2)
PIUNT (grant E519)
Consejo Nacional de Investigaciones Científicas y Técnicas de Argentina (grant PIP553)
Agencia Nacional de Promoción de la Investigación, el Desarrollo Tecnológico y la Innovación (grant PICT11 1807)
National Institutes of Health (grant EY001792)
Databáze: OpenAIRE
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