Visual field asymmetries in visual word form identification

IF 1.5 4区 心理学 Q4 NEUROSCIENCES Vision Research Pub Date : 2024-04-13 DOI:10.1016/j.visres.2024.108413
Li-Ting Tsai , Kuo-Meng Liao , Chiun-Ho Hou , Yuh Jang , Chien-Chung Chen
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Abstract

Visual performance across the visual fields interacts with visual tasks and visual stimuli, and visual resolution decreases as a function of eccentricity, varying at isoeccentric locations. In this study, we investigated the extent of asymmetry and the rate of change in visual acuity threshold for visual word form (VWF) identification at horizontal and vertical azimuths across the fovea, and at eccentricities of 1°, 2°, 4°, 6° and 8° for 10%, 20%, 40%, and 80% contrast levels, to determine whether and how the eccentricities, meridians, and contrasts modulated the VWF identification acuity threshold. The stimuli were 16 traditional Chinese characters of similar legibility. Participants pressed a key to indicate the character presented, either monocularly or binocularly, at one of 21 randomly selected locations. A staircase procedure was used to determine the threshold, and a multiple linear regression model was used to fit the linear cortical magnification factor (CMF). We found that (1) the asymmetry was most pronounced on the vertical and superior azimuths, (2) the asymmetry between the right and left azimuths was not significant, (3) the CMF was significantly smaller on the vertical azimuth than on the horizontal azimuth, (4) the CMF was smaller on the superior vertical azimuth than on the inferior azimuth, and (5) monocular viewing and low contrast enhanced the CMF difference between azimuths. In conclusion, vertical and horizontal azimuths, location of eccentricity, contrast levels of word symbols, and monocular/binocular viewing have different effects on visual field asymmetry and cortical magnification factors.

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视觉词形识别中的视野不对称问题
整个视野的视觉表现与视觉任务和视觉刺激相互影响,视觉分辨率随偏心率的变化而降低,在等中心位置则有所不同。在这项研究中,我们研究了在整个眼窝的水平和垂直方位角,以及偏心率为1°、2°、4°、6°和8°,对比度为10%、20%、40%和80%时,视觉字形(VWF)识别视敏度阈值的不对称程度和变化率,以确定偏心率、经线和对比度是否以及如何调节VWF识别视敏度阈值。刺激物是 16 个可读性相似的繁体字。受试者在 21 个随机选择的位置中按下一个键来指示单眼或双眼显示的字符。我们使用阶梯程序来确定阈值,并使用多元线性回归模型来拟合线性皮层放大系数(CMF)。我们发现:(1) 垂直方位角和上方位角的不对称性最明显;(2) 左右方位角的不对称性不明显;(3) 垂直方位角的 CMF 明显小于水平方位角;(4) 垂直方位角上端的 CMF 小于方位角下端的 CMF;(5) 单眼观察和低对比度增强了方位角之间的 CMF 差异。总之,垂直和水平方位角、偏心位置、单词符号的对比度以及单眼/双眼观看对视野不对称和皮层放大系数有不同的影响。
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来源期刊
Vision Research
Vision Research 医学-神经科学
CiteScore
3.70
自引率
16.70%
发文量
111
审稿时长
66 days
期刊介绍: Vision Research is a journal devoted to the functional aspects of human, vertebrate and invertebrate vision and publishes experimental and observational studies, reviews, and theoretical and computational analyses. Vision Research also publishes clinical studies relevant to normal visual function and basic research relevant to visual dysfunction or its clinical investigation. Functional aspects of vision is interpreted broadly, ranging from molecular and cellular function to perception and behavior. Detailed descriptions are encouraged but enough introductory background should be included for non-specialists. Theoretical and computational papers should give a sense of order to the facts or point to new verifiable observations. Papers dealing with questions in the history of vision science should stress the development of ideas in the field.
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