?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=Assimilation%3A+central+and+peripheral+effects&rft.creator=de+Weert%2C+Charles+M.+M.&rft.creator=van+Kruysbergen%2C+Noud+A.W.H&rft.subject=Psychophysics&rft.description=Assimilation+and+contrast+have+opposite+effects%3A+Contrast+leads+to+an+increase+of+perceived+differences+between+neighbouring+fields%2C+whereas+assimilation+leads+to+a+reduction.+It+is+relatively+easy+to+demonstrate+these+effects%2C+but+the+precise+localisation+of+these+effects+in+the+perceptual+system+is+not+yet+possible.+In+an+experiment+the+strength+of+assimilation+effects+was+modified+by+adding+spatial+noise.+By+varying+the+localisation+in+perceived+space+of+the+added+noise+(by+presentation+of+the+noise+pattern+with+different+binocular+disparities)+the+masking+effect+of+this+noise+can+be+influenced.+Masking+caused+by+binocularly+disparate+noise+is+less+than+masking+caused+by+binocularly+non-disparate+noise.+Our+conclusion+is+that+the+effect+at+least+partly+occurs+beyond+the+(binocular)+locus+of+separation+in+different+depth+planes.+A+similar+approach%2C+involving+moving+noise%2C+will+also+be+presented.+Finally%2C+several+demonstrations+show+that+images+that+are+peripherally+similar+can+give+rise+to+differences+in+the+perceived+amount+of+assimilation.+These+effects+further+indicate+that+a+central+mechanism+is+involved+in+assimilation.&rft.date=1997&rft.type=Journal+(Paginated)&rft.type=PeerReviewed&rft.format=text%2Fhtml&rft.identifier=http%3A%2F%2Fcogprints.org%2F659%2F1%2Fbressan5.html&rft.identifier=++de+Weert%2C+Charles+M.+M.+and+van+Kruysbergen%2C+Noud+A.W.H++(1997)+Assimilation%3A+central+and+peripheral+effects.++%5BJournal+(Paginated)%5D+++++&rft.relation=http%3A%2F%2Fcogprints.org%2F659%2F