Time course and neural locus of the Flashed Face Distortion Effect

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 ad...

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Bibliographic Details
Published in:Vision research (Oxford) 2024-11, Vol.224, p.108492, Article 108492
Main Authors: Gao, Yi, Miller, Kamilla N., Webster, Michael A., Crognale, Michael A., Jiang, Fang
Format: Article
Language:English
Subjects:
Averaging
Face distortion
Interocular transfer
Time course
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Summary: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.
ISSN:0042-6989
1878-5646
1878-5646
DOI:10.1016/j.visres.2024.108492