Dissociation between spatial and temporal integration mechanisms in Vernier fusion

	Dissociation between spatial and temporal integration mechanisms in Vernier fusion
	Drewes J[*]1; Zhu WN 1,2,3,4; Melcher D 1
刊名	Vision Research
	2014
卷号	105 期号:X 页码:21-28
关键词	Vernier Spatial integration Temporal integration
通讯作者	mail@jandrewes.de
英文摘要	The visual system constructs a percept of the world across multiple spatial and temporal scales. This raises the questions of whether different scales involve separate integration mechanisms and whether spatial and temporal factors are linked via spatio-temporalreference frames. We investigated this using Vernier fusion, a phenomenon in which the features of two Vernier stimuli presented in close spatio-temporal proximity are fused into a single percept. With increasing spatial offset, perception changes dramatically from a single percept into apparent motion and later, at larger offsets, into two separately perceived stimuli. We tested the link betweenspatial and temporal integration by presenting two successive Vernier stimuli presented at varying spatial and temporal offsets. The second Vernier either had the same or the opposite offset as the first. We found that the type of percept depended not only on spatialoffset, as reported previously, but interacted with the temporal parameter as well. At temporal separations around 30-40 ms the majority of trials were perceived as motion, while above 70 ms predominantly two separate stimuli were reported. The dominance of the second Vernier varied systematically with temporal offset, peaking around 40 ms ISI. Same-offset conditions showed increasing amounts of perceived separation at large ISIs, but little dependence on spatial offset. As subjects did not always completely fuse stimuli, we separated trials by reported percept (single/fusion, motion, double/segregation). We found systematic indications of spatialfusion even on trials in which subjects perceived temporal segregation. These findings imply that spatial integration/fusion may occur even when the stimuli are perceived as temporally separate entities, suggesting that the mechanisms responsible for temporalsegregation and spatial integration may not be mutually exclusive.
收录类别	SCI
资助信息	This research was supported by a European Research Council (ERC) grant (Grant Agreement No. 313658). WZ was supported by a National Natural Science Foundation of China (62263042, 61005087), China Scholarship Council Grant.
语种	英语
内容类型	期刊论文
源URL	[http://159.226.149.26:8080/handle/152453/11001]
专题	昆明动物研究所_认知障碍病理学
作者单位	1.Center for Mind/Brain Sciences (CIMeC), Trento University, Rovereto, Italy 2.School of Information Science, Yunnan University, Kunming, China 3.Department of Psychology, Giessen University, Giessen, Germany 4.Kunming Institute of Zoology, Chinese Academy of Science, Kunming, China
推荐引用方式 GB/T 7714	Drewes J[*],Zhu WN,Melcher D. Dissociation between spatial and temporal integration mechanisms in Vernier fusion[J]. Vision Research,2014,105(X):21-28.
APA	Drewes J[*],Zhu WN,&Melcher D.(2014).Dissociation between spatial and temporal integration mechanisms in Vernier fusion.Vision Research,105(X),21-28.
MLA	Drewes J[*],et al."Dissociation between spatial and temporal integration mechanisms in Vernier fusion".Vision Research 105.X(2014):21-28.