Boon Paul J, Theeuwes Jan, Belopolsky Artem V
Department of Cognitive Psychology, Vrije Universiteit, Amsterdam, The Netherlands.
Department of Cognitive Psychology, Vrije Universiteit, Amsterdam, The Netherlands.
Vision Res. 2014 Jan;94:51-7. doi: 10.1016/j.visres.2013.11.002. Epub 2013 Nov 18.
Working memory enables temporary maintenance and manipulation of information for immediate access by cognitive processes. The present study investigates how spatial information stored in working memory is updated during object movement. Participants had to remember a particular location on an object which, after a retention interval, started to move. The question was whether the memorized location was updated with the movement of the object or whether after object movement it remained represented in retinotopic coordinates. We used saccade trajectories to examine how memorized locations were represented. The results showed that immediately after the object stopped moving, there was both a retinotopic and an object-centered representation. However, 200ms later, the activity at the retinotopic location decayed, making the memory representation fully object-centered. Our results suggest that memorized locations are updated from retinotopic to object-centered coordinates during, or shortly after object movement.
工作记忆能够对信息进行临时存储和操作，以便认知过程即时访问。本研究调查了在物体移动过程中，工作记忆中存储的空间信息是如何更新的。参与者必须记住物体上的一个特定位置，在一段保持间隔后，该物体开始移动。问题在于，记忆中的位置是随着物体的移动而更新，还是在物体移动后仍以视网膜坐标来表征。我们使用扫视轨迹来研究记忆位置是如何被表征的。结果表明，物体停止移动后立即出现了视网膜坐标和以物体为中心的两种表征。然而，200毫秒后，视网膜坐标位置的活动衰减，使得记忆表征完全以物体为中心。我们的研究结果表明，在物体移动期间或之后不久，记忆位置会从视网膜坐标更新为以物体为中心的坐标。
