Asymmetries in visual acuity around the visual field.
Asymmetries in visual acuity around the visual field.
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DOI：
10.1167/jov.21.1.2
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发表时间：
2021-01-04
影响因子：
1.8
通讯作者：
Carrasco M
中科院分区：
文献类型：
--
作者：
Barbot A;Xue S;Carrasco M
人类视觉在视野周围是异质的。在固定偏心率下，沿着水平子午线的性能优于沿垂直子午线的性能，沿着较低的垂直子午线的性能优于沿较高的垂直子午线的性能。这些不对称的模式，被称为性能领域，已被发现在许多视觉任务，包括那些介导的对比敏感度和空间分辨率。然而，目前尚不清楚空间分辨率不对称性是否仅限于主子午线，或者它们是否延伸到上半野和下半野以及延伸到多远。在这里，我们在等偏心周边位置（10度偏心），每15°的极角测量视力。在每次试验中，观察者判断空间频率（SF）不同的四个等距阈上光栅刺激之一的方向（± 45°）。在每个区块上，我们在24个等偏心位置中的4个位置测量了作为刺激SF的函数的性能。我们估计了75%正确的SF阈值，SF截止点（即，机会水平）和每个位置的心理测量函数的斜率。我们发现更高的SF估计值（即，更好的敏锐度）对于水平子午线比垂直子午线和对于下垂直子午线比上垂直子午线。这些不对称性在主子午线上最明显，随着与垂直子午线的角距离的增加而逐渐减小。敏锐度随极角的逐渐变化反映了心理测量功能的转变，而斜率没有变化。在双眼和单眼观察条件下发现了相同的模式。这些发现推进了我们对视野周围视觉处理的理解，并有助于限制视觉感知模型。
Human vision is heterogeneous around the visual field. At a fixed eccentricity, performance is better along the horizontal than the vertical meridian and along the lower than the upper vertical meridian. These asymmetric patterns, termed performance fields, have been found in numerous visual tasks, including those mediated by contrast sensitivity and spatial resolution. However, it is unknown whether spatial resolution asymmetries are confined to the cardinal meridians or whether and how far they extend into the upper and lower hemifields. Here, we measured visual acuity at isoeccentric peripheral locations (10 deg eccentricity), every 15° of polar angle. On each trial, observers judged the orientation (± 45°) of one of four equidistant, suprathreshold grating stimuli varying in spatial frequency (SF). On each block, we measured performance as a function of stimulus SF at 4 of 24 isoeccentric locations. We estimated the 75%-correct SF threshold, SF cutoff point (i.e., chance-level), and slope of the psychometric function for each location. We found higher SF estimates (i.e., better acuity) for the horizontal than the vertical meridian and for the lower than the upper vertical meridian. These asymmetries were most pronounced at the cardinal meridians and decreased gradually as the angular distance from the vertical meridian increased. This gradual change in acuity with polar angle reflected a shift of the psychometric function without changes in slope. The same pattern was found under binocular and monocular viewing conditions. These findings advance our understanding of visual processing around the visual field and help constrain models of visual perception.
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DOI：
10.3758/bf03208380
发表时间：
1995-11-01
期刊：
PERCEPTION & PSYCHOPHYSICS
影响因子：
--
作者：
CARRASCO, M;EVERT, DL;KATZ, SM
通讯作者：
KATZ, SM
影响因子：
1.8
作者：
Carrasco, Marisa;Williams, Patrick E;Yeshurun, Yaffa
通讯作者：
Yeshurun, Yaffa
影响因子：
1.8
作者：
Bradley, Chris;Abrams, Jared;Geisler, Wilson S.
通讯作者：
Geisler, Wilson S.
影响因子：
1.7
作者：
EDGAR, GK;SMITH, AT
通讯作者：
SMITH, AT
影响因子：
2.5
作者：
CONNOLLY, M;VANESSEN, D
通讯作者：
VANESSEN, D