论文标题
使大脑这么长的是什么：在最小图像级别上的对象识别最多持续几秒钟的演示时间
What takes the brain so long: Object recognition at the level of minimal images develops for up to seconds of presentation time
论文作者
论文摘要
丰富的经验证据表明，大脑中的视觉对象识别是快速而轻松的，相关的大脑信号据报道最早在80 ms开始。在这里，我们在最小识别图像（称为MIRC）的水平上研究了识别过程的时间轨迹。这些图像可以可靠地识别出来，但是在其中，图像的分钟变化（减少大小或分辨率）对识别具有巨大的影响。将受试者分配给九个暴露条件之一：200、500、1000、2000毫秒，带有或不带掩盖，以及无限的时间。介绍后，受试者的响应时间并不有限。结果表明，在掩盖条件下，识别率在长时间内逐渐发展，例如200毫秒暴露的平均值为18％，500毫秒为45％，即使在2秒以上，较长的暴露量也会显着增加。当呈现无限的时间（直到响应）时，MIRC识别率等效于50 ms的全体图像的速率，然后掩盖。是什么花这么长时间才能识别出这种图像？我们讨论为什么涉及眼动，感知决策和模式完成的过程不太可能解释。另外，我们假设MIRC识别需要扩展自上而下的过程，以补充进料阶段。
Rich empirical evidence has shown that visual object recognition in the brain is fast and effortless, with relevant brain signals reported to start as early as 80 ms. Here we study the time trajectory of the recognition process at the level of minimal recognizable images (termed MIRC). These are images that can be recognized reliably, but in which a minute change of the image (reduction by either size or resolution) has a drastic effect on recognition. Subjects were assigned to one of nine exposure conditions: 200, 500, 1000, 2000 ms with or without masking, as well as unlimited time. The subjects were not limited in time to respond after presentation. The results show that in the masked conditions, recognition rates develop gradually over an extended period, e.g. average of 18% for 200 ms exposure and 45% for 500 ms, increasing significantly with longer exposure even above 2 secs. When presented for unlimited time (until response), MIRC recognition rates were equivalent to the rates of full-object images presented for 50 ms followed by masking. What takes the brain so long to recognize such images? We discuss why processes involving eye-movements, perceptual decision-making and pattern completion are unlikely explanations. Alternatively, we hypothesize that MIRC recognition requires an extended top-down process complementing the feed-forward phase.
