Do fixational eye-movements actively and optimally sample the retinal stimulus? - WCUB, ENWW

凝视性眼球运动是在视觉注视过程中发生的微小眼球运动。它们对于防止视觉刺激的褪色是必要的，因为据报道，当刺激通过抵消眼球运动而稳定在视网膜上时，就会褪色(例如。Martinez-Conde，Macknik，TronCoso，&Dyar，2006；Riggs，Ratliff，CornSweet，&CornSweet，1953)。因此，与直觉相反，注视和观看刺激需要运动，因为如果没有这些运动，感知世界将不断褪色到没有特征。在我的DPhil中，我想研究注视眼球运动是如何受到刺激的影响的，即刺激的某些性质，如大小、亮度和形状，与观察者的个体光感受器马赛克相关，是否改变了注视眼球运动的模式。已知凝视眼球运动在不同条件下表现出质的差异(例如，Ditchburn&Ginsborg，1953)，但目前尚不清楚是什么驱动了这一现象。这个项目将使用自适应光学扫描激光眼底镜(AOSLO)来提取单锥体分辨率的注视眼球运动，并将它们与光感受器镶嵌相关联。与目前对凝视眼球运动的其他研究不同，这些研究主要集中在注意力效应上，我感兴趣的是测试凝视眼球运动是否适应刺激，以及个体的光感受器马赛克采集刺激的方式，这就像个人的指纹一样独特。这个项目认为视觉是一个活跃的过程，因此眼睛的运动是视觉感觉的一个基本部分(Findlay&Gilchrist，2003)。BBSRC的优先领域：生物科学、脑科学和心理健康的技术发展

Fixational eye movements are small eye movements that occur during visual fixation. They are necessary to prevent fading of a visual stimulus, as fading is reported when a stimulus is stabilised on the retina by counteracting eye movements (eg. Martinez-Conde, Macknik, Troncoso, & Dyar, 2006; Riggs, Ratliff, Cornsweet, & Cornsweet, 1953). Thus, counterintuitively, movement is required to fixate on and see stimuli, as without these movements the perceptual world would continually fade to a featureless grey.In my DPhil I want to investigate how fixational eye movements are influenced by the stimulus, i.e. whether certain qualities of the stimulus, such as size, luminance and shape, in relation to the individual photoreceptor mosaic of the observer, change the patterns of fixational eye movements. Fixational eye movements are known to display qualitative differences in different conditions (eg. Ditchburn & Ginsborg, 1953), but it is not known what drives this. This project will use an adaptive optics scanning laser ophthalmoscope (AOSLO) to extract fixational eye movements at single cone resolution and reference them to the photoreceptor mosaic. Unlike other current research into fixational eye movements, which is largely focussed on attentional effects, I am interested in testing whether fixational eye movements adapt to the stimulus and to the way in which that stimulus is sampled by the individual's photoreceptor mosaic, which is as unique as an individual's fingerprint. This project considers vision as an active process, whereby the movement of the eyes is a fundamental part of visual sensation (Findlay & Gilchrist, 2003).BBSRC Priority Areas: Technology development for the biosciences, Brain Science and Mental Health