Objective measurement of visual resolution using the P300 to self-facial images
Objective measurement of visual resolution using the P300 to self-facial images
复制标题
使用 P300 客观测量自身面部图像的视觉分辨率
DOI：
10.1007/s10633-015-9502-1
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发表时间：
2015
影响因子：
1.4
通讯作者：
Heinrich SP
中科院分区：
文献类型：
--
作者：
Marhöfer DJ;Bach M;Heinrich SP
目的P300事件相关电位是一种有希望的、与意识知觉密切相关的候选诱发电位，能客观地评估V1以外的视力。然而，P300可以随意调节，这对客观视力评估是一个不利因素。面孔是非常突出的刺激，很难被忽视。在此，我们提出了一种P300类型的范式来评估人脸的视觉敏锐度。方法将被试的灰度级肖像作为奇怪的刺激(概率1/7)，将这些图像的置乱版本作为标准刺激(概率6/7)。此外，刺激在空间上经过高通滤波(在0、2.2、4.2和8.3cpd)，使它们只有在足够敏锐的情况下才能识别。屈光模糊系统地降低了视力，当≥为4.2cpd时，单独选择屈光模糊以使人脸无法识别。11名受试者在32个头皮位置记录脑电，并重新参考TP9和TP10的平均值。其中一个罕见的面部变异被指定为靶标，为此必须按下按钮。结果事件相关电位在300-800毫秒内以P300为主。对于0-至8.3-CPD过滤，所有受试者都有显著的(P<；或0.05)P300。当视力模糊时，对8.3-CPD滤光脸的显著P300反应下降到18%，但对4.2CPD滤光脸的显著P300反应保持在100%。另一个成分，170毫秒的顶点正电位(VPP)，在大多数模糊和所有级别的过滤的参与者中都检测不到，即使图像是可识别的。结论本研究证明了基于面部的P300方法客观评估视力的可行性。对刺激退化的敏感性与先前报道的基于栅格的方法相当。一个意想不到的发现是P300和VPP的行为不同。VPP对高通过滤非常敏感，而P300保持了更强的过滤，尽管对于它的生成，人脸也必须与混乱的人脸区分开来。
ObjectiveTo assess visual acuity objectively “beyond V1”, the P300 event-related potential is a promising candidate and closely associated with conscious perception. However, the P300 can be willfully modulated, a disadvantage for objective visual acuity estimation. Faces are very salient stimuli and difficult to ignore. Here, we present a P300-type paradigm to assess visual acuity with faces.MethodsGray-scale portraits of the respective subject served as oddball stimuli (probability 1/7), scrambled versions of these as the standard stimuli (probability 6/7). Furthermore, stimuli were spatially high-pass filtered (at 0, 2.2, 4.2 and 8.3 cpd), making them recognizable only with sufficient acuity. Acuity was systematically reduced by dioptric blur, chosen individually to render faces unrecognizable when high-passed at ≥ 4.2 cpd. EEG was recorded from 11 subjects at 32 scalp positions and re-referenced to the average of TP9 and TP10. One of the rare face variants was designated as target, for which a button had to be pressed.ResultsThe event-related potential was dominated by the P300 at 300–800 ms. All subjects had a significant (P< 0.05) P300 for 0- to 8.3-cpd filtering. When vision was blurred, the fraction of significant P300 responses to 8.3-cpd filtered faces dropped to 18 %, but stayed at 100 % for 4.2 cpd. Another component, the vertex positive potential (VPP) at 170 ms, was undetectable in most participants with blur and all levels of filtering, even when the images were recognizable.ConclusionsThe study demonstrates the feasibility of a face-based P300 approach to objectively assess visual acuity. The sensitivity to stimulus degradation was comparable to that of a grating-based approach as previously reported. An unexpected finding was the differing behavior of the P300 and the VPP. The VPP was quite sensitive to high-pass filtering, while the P300 sustained stronger filtering, although for its generation, the faces must also be discriminated from scrambled faces.
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DOI：
10.1113/jphysiol.1975.sp010953
发表时间：
1975
期刊：
The Journal of Physiology
影响因子：
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作者：
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DOI：
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发表时间：
1981
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DOI：
10.1615/critrevneurobiol.v14.i3-4.20
发表时间：
2000
期刊：
Critical reviews in neurobiology
影响因子：
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作者：
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DOI：
10.1016/0013-4694(90)90138-a
发表时间：
1990-06-01
期刊：
ELECTROENCEPHALOGRAPHY AND CLINICAL NEUROPHYSIOLOGY
影响因子：
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影响因子：
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J. Howard;L. Dorfman
通讯作者：
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