An objective method for measuring face detection thresholds using the sweep steady-state visual evoked response
An objective method for measuring face detection thresholds using the sweep steady-state visual evoked response
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DOI：
10.1167/12.10.18
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发表时间：
2012-01-01
影响因子：
1.8
通讯作者：
Norcia, Anthony M.
中科院分区：
文献类型：
--
作者：
Ales, Justin M.;Farzin, Faraz;Norcia, Anthony M.
我们介绍了一种敏感的方法，用于快速，客观，独立于低级别的视觉线索测量人脸检测阈值。该方法基于扫频参数稳态视觉诱发电位（ssVEP），其中刺激以特定的时间频率呈现，同时参数地改变（“扫频”）刺激的可检测性。在这里，人脸图像的可见性是通过在一系列等间隔的步骤中对图像的相位谱进行渐进去随机化来增加的。以恒定速率（3/s）在面部和完全随机化的图像之间的交替引起针对面部结构的3 Hz的稳健的第一谐波响应。研究人员记录了10名成年参与者的高密度脑电图，这些参与者被要求在检测到人脸时立即按下按钮。大多数参与者在第一谐波（3 Hz）下产生诱发反应，该反应在面部30%至35%的相位相干性之间突然出现，这在右侧枕颞部位最为突出。在15次试验的单个参与者中，或在15次单独的面部试验中的每一次中，可靠地估计了面部检测的阈值。ssVEP导出的阈值与同时测量的感知面部检测阈值相关。扫描VEP方法首次应用于高级视觉，提供了一种灵敏和客观的方法，可用于测量和比较不同人群（包括婴儿和发育迟缓的个体）中各种物体形状和分类水平的视觉感知阈值。
We introduce a sensitive method for measuring face detection thresholds rapidly, objectively, and independently of low-level visual cues. The method is based on the swept parameter steady-state visual evoked potential (ssVEP), in which a stimulus is presented at a specific temporal frequency while parametrically varying ("sweeping'') the detectability of the stimulus. Here, the visibility of a face image was increased by progressive derandomization of the phase spectra of the image in a series of equally spaced steps. Alternations between face and fully randomized images at a constant rate (3/s) elicit a robust first harmonic response at 3 Hz specific to the structure of the face. High-density EEG was recorded from 10 human adult participants, who were asked to respond with a button-press as soon as they detected a face. The majority of participants produced an evoked response at the first harmonic (3 Hz) that emerged abruptly between 30% and 35% phase-coherence of the face, which was most prominent on right occipito-temporal sites. Thresholds for face detection were estimated reliably in single participants from 15 trials, or on each of the 15 individual face trials. The ssVEP-derived thresholds correlated with the concurrently measured perceptual face detection thresholds. This first application of the sweep VEP approach to high-level vision provides a sensitive and objective method that could be used to measure and compare visual perception thresholds for various object shapes and levels of categorization in different human populations, including infants and individuals with developmental delay.