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    188宝金博页面版: Running title Consolidation of visual images Send correspondence to

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    内容提示： 1Time window from visual images to visual short-term memory:Consolidation or integration?Yuhong J iangMassachusetts Institute of TechnologyRunning title: Consolidation of visual imagesSend correspondence to:Yuhong J iang77 Massachusetts AvenueNE20-443, MITCambridge, MA 02139E-mail: yuhong@MIT.EDUPhone: 617-258-0670Fax: 617-258-8654 (specify NE20-443 on the cover)Abstract:When two dot arrays are briefly presented, separated by a short interval oftime, visual short-term memory of the first array is disru...

    文档格式：PDF | 页数：12 | 浏览次数：24 | 上传日期：2015-04-21 15:19:35 | 文档星级：
    1Time window from visual images to visual short-term memory:Consolidation or integration?Yuhong J iangMassachusetts Institute of TechnologyRunning title: Consolidation of visual imagesSend correspondence to:Yuhong J iang77 Massachusetts AvenueNE20-443, MITCambridge, MA 02139E-mail: yuhong@MIT.EDUPhone: 617-258-0670Fax: 617-258-8654 (specify NE20-443 on the cover)Abstract:When two dot arrays are briefly presented, separated by a short interval oftime, visual short-term memory of the first array is disrupted if the intervalbetween arrays is shorter than 300-500 ms (Brockmole, Wang, & Irwin, 2002).Here we investigated whether such a time window was triggered by the necessityto integrate arrays. Using a probe task we removed the need for integration butretained the requirement to represent the images. We found that a long timewindow was needed for performance to reach asymptote even when integrationacross images was not required. Furthermore, such window was lengthened ifsubjects had to remember the locations of the second array, but not if they onlyconducted a visual search among it. We suggest that a temporal window isrequired for consolidation of the first array, which is vulnerable to disruption bysubsequent images that also need to be memorized.IntroductionA recent study conducted by Brockmole, Wang, and Irwin (2002)convincingly demonstrated that a long time window, on the order of 300-500 ms,is needed to represent a visual image in a stable form in visual short-termmemory (VSTM). This finding was revealed in a clever, temporal integration task(Di Lollo, 1980). On a 5 by 5 grid, Brockmole et al. presented two dot arrays, eachoccupying a different set of 12 cells, such that when overlaid on the grid, thearrays would cover the entire grid except one cell. Upon the presentation of thesecond dot array, subjects were asked to report which cell was the empty one.Subjects rarely made errors in mistaking the second array as the empty cell, andsuch errors, when committed, were unaffected by the inter-stimulus-interval(ISI) between the two arrays. However, subjects often mistook cells of the firstarray as the empty cell. These errors were infrequent when the ISI was zero, butincreased dramatically for ISI 100 ms or greater, and gradually leveled off for ISIbeyond 300-500 ms. Performance asymptoted at around 500 ms. Such a longtemporal window before asymptote is surprising, given that visual sensory

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