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Reduced visual acuity is mirrored in low vision imagery
British Journal of Psychology ( IF 4.981 ) Pub Date : 2021-02-04 , DOI: 10.1111/bjop.12493
Aries Arditi 1 , Gordon Legge 2 , Christina Granquist 2 , Rachel Gage 2 , Dawn Clark 2
Affiliation  

Research has examined the nature of visual imagery in normally sighted and blind subjects, but not in those with low vision. Findings with normally sighted subjects suggest that imagery involves primary visual areas of the brain. Since the plasticity of visual cortex appears to be limited in adulthood, we might expect imagery of those with adult-onset low vision to be relatively unaffected by these losses. But if visual imagery is based on recent and current experience, we would expect images of those with low vision to share some properties of impaired visual perception. We examined key parameters of mental images reported by normally sighted subjects, compared to those with early- and late-onset low vision, and with a group of subjects with restricted visual fields using an imagery questionnaire. We found evidence that those with reduced visual acuity report the imagery distances of objects to be closer than those with normal acuity and also depict objects in imagery with lower resolution than those with normal visual acuity. We also found that all low vision groups, like the normally sighted, image objects at a substantially greater distance than when asked to place them at a distance that ‘just fits’ their imagery field (overflow distance). All low vision groups, like the normally sighted, showed evidence of a limited visual field for imagery, but our group with restricted visual fields did not differ from the other groups in this respect. We conclude that imagery of those with low vision is similar to that of those with normal vision in being dependent on the size of objects or features being imaged, but that it also reflects their reduced visual acuity. We found no evidence for a dependence on imagery of age of onset or number of years of vision impairment.

中文翻译:

视力下降反映在低视力图像中

研究已经检查了正常视力和盲人的视觉图像的性质,但不是那些视力低下的人。正常视力受试者的研究结果表明,意象涉及大脑的主要视觉区域。由于视觉皮层的可塑性似乎在成年期受到限制,我们可能预计成年期低视力患者的图像相对不受这些损失的影响。但是,如果视觉图像是基于最近和当前的经验,我们会期望低视力者的图像具有视觉感知受损的某些特性。我们使用图像问卷调查了正常视力受试者报告的心理图像的关键参数,与早期和晚期低视力的受试者以及一组视野受限的受试者相比。我们发现有证据表明,视力下降的人报告物体的图像距离比视力正常的人更近,并且在图像中描绘的物体的分辨率低于视力正常的人。我们还发现,所有低视力组,如正常视力,图像对象的距离远大于被要求将它们放置在“恰好适合”其图像场的距离(溢出距离)。所有低视力组,如正常视力,都显示出图像视野受限的证据,但我们的视野受限组在这方面与其他组没有区别。我们得出结论,低视力者的图像与视力正常者的图像相似,取决于被成像物体或特征的大小,但这也反映了他们的视力下降。我们没有发现依赖于发病年龄或视力障碍年数的图像的证据。
更新日期:2021-02-04
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