Lopes Gabriel, Tavares Mara, Mendonça Catarina
Department of Psychology, University of the Azores, Ponta Delgada, Portugal.
University Research Center in Psychology, University of Algarve, Faro, Portugal.
Front Hum Neurosci. 2025 May 15;19:1553504. doi: 10.3389/fnhum.2025.1553504. eCollection 2025.
How can we predict if a brief stimulus will be detected or perceived when embedded in a dynamic natural scene, such as those we encounter in our daily lives? This is a complex problem, with several approaches to it. Here, we were interested in determining the minimum luminance contrast to the background scene required to achieve detection and shape perception. To investigate this, we used natural videos with briefly appearing natural events, varying in timing of appearance, shape, position, and contrast. We found that there is an interplay between the timing of the event, its position, and the contrast needed for detection. However, for correct shape perception, timing was not a relevant variable. A lower contrast was required for event detection than for correct shape perception. We conclude that contrast alone can affect stimulus detection, but other parameters might interact with it in this task.
当一个短暂的刺激嵌入到动态自然场景（比如我们在日常生活中遇到的场景）中时，我们如何预测它是否会被检测到或感知到呢？这是一个复杂的问题，有几种解决方法。在这里，我们感兴趣的是确定实现检测和形状感知所需的与背景场景的最小亮度对比度。为了研究这一点，我们使用了带有短暂出现的自然事件的自然视频，这些事件在出现时间、形状、位置和对比度方面各不相同。我们发现事件的时间、其位置以及检测所需的对比度之间存在相互作用。然而，对于正确的形状感知，时间不是一个相关变量。与正确的形状感知相比，事件检测所需的对比度更低。我们得出结论，仅对比度就可以影响刺激检测，但在这项任务中其他参数可能会与之相互作用。
