---
abstract: 'Assimilation and contrast have opposite effects: Contrast leads to an increase of perceived differences between neighbouring fields, whereas assimilation leads to a reduction. It is relatively easy to demonstrate these effects, 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, involving moving noise, will also be presented. Finally, 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.'
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chapter: ~
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creators_name:
- family: de Weert
given: Charles M. M.
honourific: ''
lineage: ''
- family: van Kruysbergen
given: Noud A.W.H
honourific: ''
lineage: ''
date: 1997
date_type: published
datestamp: 1998-05-11
department: ~
dir: disk0/00/00/06/59
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editors_id: []
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eprint_status: archive
eprintid: 659
fileinfo: /style/images/fileicons/text_html.png;/659/1/bressan5.html
full_text_status: public
importid: ~
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ispublished: pub
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item_issues_comment: []
item_issues_count: 0
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item_issues_status: []
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keywords: 'assimilation, spreading'
lastmod: 2011-03-11 08:54:10
latitude: ~
longitude: ~
metadata_visibility: show
note: ~
number: ~
pagerange: 1217-1224
pubdom: FALSE
publication: Perception
publisher: ~
refereed: TRUE
referencetext: ~
relation_type: []
relation_uri: []
reportno: ~
rev_number: 8
series: ~
source: ~
status_changed: 2007-09-12 16:32:36
subjects:
- psy-phys
succeeds: ~
suggestions: ~
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thesistype: ~
title: 'Assimilation: central and peripheral effects'
type: journalp
userid: 162
volume: 26