{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,12]],"date-time":"2026-05-12T23:24:32Z","timestamp":1778628272078,"version":"3.51.4"},"reference-count":43,"publisher":"MIT Press - Journals","issue":"1","content-domain":{"domain":["direct.mit.edu"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2010,1,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:p>Attention selects objects or groups as the most fundamental unit, and this may be achieved through a process in which attention automatically spreads throughout their entire region. Previously, we found that a lateralized potential relative to an attended hemifield at occipito-temporal electrode sites reflects attention-spreading in response to connected bilateral stimuli [Kasai, T., &amp; Kondo, M. Electrophysiological correlates of attention-spreading in visual grouping. NeuroReport, 18, 93\u201398, 2007]. The present study examined the nature of object representations by manipulating the extent of grouping through connectedness, while controlling the symmetrical structure of bilateral stimuli. The electrophysiological results of two experiments consistently indicated that attention was guided twice in association with perceptual grouping in the early phase (N1, 150\u2013200 msec poststimulus) and with the unity of an object in the later phase (N2pc, 310\/330\u2013390 msec). This suggests that there are two processes in object-based spatial selection, and these are discussed with regard to their cognitive mechanisms and object representations.<\/jats:p>","DOI":"10.1162\/jocn.2008.21158","type":"journal-article","created":{"date-parts":[[2008,11,18]],"date-time":"2008-11-18T15:22:37Z","timestamp":1227021757000},"page":"12-22","update-policy":"https:\/\/2.zoppoz.workers.dev:443\/https\/doi.org\/10.1162\/mitpressjournals.corrections.policy","source":"Crossref","is-referenced-by-count":14,"title":["Attention-spreading Based on Hierarchical Spatial Representations for Connected Objects"],"prefix":"10.1162","volume":"22","author":[{"given":"Tetsuko","family":"Kasai","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"281","published-online":{"date-parts":[[2010,1,1]]},"reference":[{"key":"2021072900363739400_R1","doi-asserted-by":"crossref","first-page":"1604","DOI":"10.3758\/BF03213121","article-title":"Objects of attention, objects of perception.","volume":"61","author":"Avrahami","year":"1999","journal-title":"Perception & Psychophysics"},{"key":"2021072900363739400_R2","doi-asserted-by":"crossref","first-page":"329","DOI":"10.1111\/1467-9280.00360","article-title":"Evidence for two components of object-based selection.","volume":"12","author":"Awh","year":"2001","journal-title":"Psychological Science"},{"key":"2021072900363739400_R3","doi-asserted-by":"crossref","first-page":"18751","DOI":"10.1073\/pnas.0507704102","article-title":"The spread of attention across modalities and space in a multisensory object.","volume":"102","author":"Busse","year":"2005","journal-title":"Proceedings of the National Academy of Sciences, U.S.A."},{"key":"2021072900363739400_R4","doi-asserted-by":"crossref","first-page":"257","DOI":"10.3758\/BF03204507","article-title":"PsyScope: An interactive graphic system for designing and controlling experiments in the psychology laboratory using Macintosh computers.","volume":"25","author":"Cohen","year":"1993","journal-title":"Behavior Research Methods, Instruments, and Computers"},{"key":"2021072900363739400_R5","doi-asserted-by":"crossref","first-page":"193","DOI":"10.1146\/annurev.ne.18.030195.001205","article-title":"Neural mechanisms of selective visual attention.","volume":"18","author":"Desimone","year":"1995","journal-title":"Annual Review of Neuroscience"},{"key":"2021072900363739400_R6","first-page":"448","article-title":"Movement and visual attention: The spotlight metaphor breaks down.","volume":"15","author":"Driver","year":"1989","journal-title":"Journal of Experimental Psychology: Human Perception and Performance"},{"key":"2021072900363739400_R7","first-page":"299","article-title":"Attention and visual object segmentation.","volume-title":"The attentive brain","author":"Driver","year":"1998"},{"key":"2021072900363739400_R8","doi-asserted-by":"crossref","first-page":"501","DOI":"10.1037\/0096-3445.113.4.501","article-title":"Selective attention and the organization of visual information.","volume":"113","author":"Duncan","year":"1984","journal-title":"Journal of Experimental Psychology: General"},{"key":"2021072900363739400_R9","doi-asserted-by":"crossref","first-page":"161","DOI":"10.1037\/0096-3445.123.2.161","article-title":"Shifting visual attention between-object and locations: Evidence from normal and parietal lesion subjects.","volume":"123","author":"Egly","year":"1994","journal-title":"Journal of Experimental Psychology: General"},{"key":"2021072900363739400_R10","first-page":"897","article-title":"Modulation of object-based attention by spatial focus under endogenous and exogenous orienting.","volume":"29","author":"Goldsmith","year":"2003","journal-title":"Journal of Experimental Psychology: Human Perception and Performance"},{"key":"2021072900363739400_R11","doi-asserted-by":"crossref","first-page":"926","DOI":"10.1111\/1469-8986.3860926","article-title":"Neural substrates for visual perceptual grouping in humans.","volume":"38","author":"Han","year":"2001","journal-title":"Psychophysiology"},{"key":"2021072900363739400_R12","doi-asserted-by":"crossref","first-page":"1085","DOI":"10.1162\/0898929041502689","article-title":"Cue validity and object-based attention.","volume":"16","author":"He","year":"2004","journal-title":"Journal of Cognitive Neuroscience"},{"key":"2021072900363739400_R13","doi-asserted-by":"crossref","first-page":"511","DOI":"10.1016\/0013-4694(90)90138-A","article-title":"Visual event-related potentials index focused attention within bilateral stimulus arrays: I. 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