The Status of Vernier Acuity Following Late Sight Onset

IF 3.1 1区 心理学 Q2 PSYCHOLOGY, DEVELOPMENTAL
Lukas Vogelsang, Priti Gupta, Marin Vogelsang, Pragya Shah, Kashish Tiwari, Dhun Verma, Mrinalini Yadav, Sruti Raja, Suma Ganesh, Pawan Sinha
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Abstract

We possess a remarkably acute ability to detect even small misalignments between extended line segments. This “vernier acuity” significantly exceeds our “resolution acuity”—the ability to resolve closely separated stimuli—and is generally considered a “hyperacuity,” since the detectable misalignments are markedly finer than the diameter of single retinal cones. Vernier acuity has, thus, often been proposed to reflect spatial organization and multi-unit cortical processing, rendering it an important index of visual function. Notably, vernier acuity exhibits a characteristic developmental signature: it is inferior to resolution acuity early in life but eventually exceeds it by up to one order of magnitude. However, vernier acuity may be disproportionately sensitive to developmental disruptions. Here, we examined the resilience of acquiring this visual proficiency to early-onset, prolonged deprivation by longitudinally tracking vernier and resolution acuities in children with dense congenital cataracts who gained sight late in life as part of Project Prakash. Our data reveal marked longitudinal improvements in both acuity measures and also demonstrate that, like the normally-sighted, late-sighted individuals’ vernier acuity exceeds their resolution acuity, thereby rendering it a hyperacuity. However, the extent of this hyperacuity is weaker than observed in normally-sighted controls, pointing to partial limitations in postsurgical skill acquisition. Despite these constraints, our findings point to the feasibility of forming some integrative circuits in the visual system even when inputs are severely compromised, and to the availability of some residual plasticity late in childhood, with implications for the rehabilitation prospects of children following treatment for congenital cataracts.

Abstract Image

晚期视力丧失后的视力状况
我们拥有一种非常敏锐的能力,可以检测到延伸线段之间甚至很小的错位。这种“游标敏锐度”明显超过了我们的“分辨敏锐度”——分辨紧密分离的刺激的能力——通常被认为是“超敏锐度”,因为可检测到的错位明显比单个视网膜锥体的直径还要小。因此,游标锐度经常被认为是反映空间组织和多单元皮质加工的指标,使其成为视觉功能的重要指标。值得注意的是,游标敏锐度表现出一种特有的发育特征:它在生命早期不如分辨率敏锐度,但最终超过分辨率敏锐度一个数量级。然而,游标敏锐度可能对发育中断异常敏感。在这里,我们通过纵向跟踪在普拉卡什项目中获得视力的致密性先天性白内障儿童的游标和分辨力,研究了获得这种视力能力对早发性长期剥夺的恢复能力。我们的数据显示,两种视力指标都有显著的纵向改善,并且还表明,像正常视力的人一样,晚视力的人的游标视力超过了他们的分辨力,从而使其成为超视。然而,与正常视力的对照组相比,这种超敏程度较弱,这表明术后技能习得的部分局限性。尽管存在这些限制,我们的研究结果指出,即使在输入严重受损的情况下,在视觉系统中形成一些整合电路是可行的,并且在儿童晚期仍有一些剩余的可塑性,这对先天性白内障治疗后儿童的康复前景具有重要意义。
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来源期刊
CiteScore
8.10
自引率
8.10%
发文量
132
期刊介绍: Developmental Science publishes cutting-edge theory and up-to-the-minute research on scientific developmental psychology from leading thinkers in the field. It is currently the only journal that specifically focuses on human developmental cognitive neuroscience. Coverage includes: - Clinical, computational and comparative approaches to development - Key advances in cognitive and social development - Developmental cognitive neuroscience - Functional neuroimaging of the developing brain
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