School of Psychology, Georgia Institute of Technology, Atlanta, GA, USA.
Neuromonitoring Associates, Las Vegas, NV, USA.
Vision Res. 2024 Nov;224:108492. doi: 10.1016/j.visres.2024.108492. Epub 2024 Sep 30.
Viewing a rapid sequence of face images shown in the periphery can lead to large caricature-like distortions in the perceived images, a phenomenon known as the Flashed Face Distortion Effect (FFDE). The mechanisms underlying FFDE are poorly understood. Here we examined the timing and sites of the adaptation processes giving rise to the FFDE. To investigate the effects of presentation rate, we maintained consistent trial lengths while assessing how variations in the temporal frequencies of face presentation influenced the magnitude of face distortion and the averaging of facial expressions. Over a wide range of temporal frequencies (1.2-60 Hz) tested, we observed a decrease in FFDE strength as the presentation rate increased. To probe the neural sites of FFDE, we varied whether successive faces were presented to the same or different eyes using a dichoptic display. Distortion effects were comparable for monocular, binocular, and interocular conditions, yet much larger than a control condition where faces were presented with a temporal interval between successive images, suggesting a cortical locus for FFDE.
快速呈现周边视野中的一系列面孔图像会导致感知到的图像出现大幅卡通变形，这种现象被称为“闪变面孔失真效应”（FFDE）。FFDE 的产生机制尚未得到充分理解。在这里，我们研究了导致 FFDE 的适应过程的时间和位置。为了研究呈现率的影响，我们在评估呈现面孔的时间频率变化如何影响面孔变形的幅度和面部表情的平均化时，保持了一致的试验长度。在测试的广泛时间频率范围内（1.2-60 Hz），我们观察到随着呈现率的增加，FFDE 强度降低。为了探测 FFDE 的神经部位，我们使用双眼分视显示来改变连续呈现的面孔是呈现给同一只眼还是不同的眼睛。对于单眼、双眼和双眼间条件，失真效应相当，但比控制条件大得多，在控制条件下，连续图像之间有时间间隔呈现面孔，这表明 FFDE 的神经部位在大脑皮层。
