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2004 > |
Course Description |
Color
and Form in Visual Perception
Rob van Lier and Charles de Weert
This course is given by two persons. One has his main background in
colour vision (Charles de Weert), the other in object perception (Rob van
Lier). Both of them are interested in the interactions between the two areas.
Rob van Lier (1960) started his education as a physics and mathematics
teacher. After that, he studied experimental psychology in Nijmegen. His PhD–thesis was entitled ‘Simplicity of visual
shape’, and he is now a research fellow and assistant professor at the Nijmegen Institute for Cognition and Information
at the University of Nijmegen. http://www.nici.kun.nl/~robvl
Charles de Weert (1942) studied
experimental physics in Utrecht. He became
involved in colour vision at the end of the sixties. His PhD thesis was
concerned with dichoptic colour and brightness experiments. He is professor in
psychophysics and was the director of the Nijmegen Institute for Cognition and
Information from 1987 until may 2003. Since then he is the dean of the faculty
of Social Sciences at the university of Nijmegen. http://www.nici.kun.nl/People/WeertdeCMM/index.html
Title From images to interpretations Part I. Lecturer: Rob van lier
Contents In the first part, a brief overview of form
perception will be given. In the second part, there will be special attention
to viewpoint dependency and viewpoint independency in object perception and to
our own information-based approach in dealing with these aspects.
Reference:
Additional Readings:
S. Palmer (1999). Vision science: from photons to phenomenology. Chapters 5-8.
Van Lier, R., & Wagemans, J. (1999).
From images to objects: Global and local completions of self-occluded parts. Journal
of Experimental Psychology: Human Perception and Performance, 25, 1721-1741.
Van Lier, R. (2002). A
double neon colour illusion. Perception. 31, 31-38.
Afternoon session (45 minutes)
Further elaboration on a experimental methods, demonstrations, and
discussion
Title Colour vision: an overview. Lecturer: Charles de Weert
Reference:
See for additional colour demomstrations: http://www.nici.kun.nl/~deweert/Isoluminance/
Afternoon session (45 minutes)
Technical workshop on color. A handout of the powerpoint presentation
will be provided.
Additional Readings:
Frequently asked Questions on
Color (author: Poynton)
S. Palmer (1999). Vision science: from photons to phenomenology. Chapter 3.
Title From images to interpretations Part II. Lecturer: Rob van Lier
Reference:
Koning, A. & Van Lier, R. (2003). Object-based connectedness
facilitates matching. Perception & Psychophysics, 65, 1094-1102.
De Wit, T. & Van Lier, R. (2002). Global visual completion of
quasi-regular shapes. Perception, 31, 969-984.
Additional Readings
S. Palmer (1999). Vision science: from photons to phenomenology. Chapters 5-8.
Van Lier, R., & Wagemans, J. (1998).
Effects of physical connectivity on the representational unity of multi-part configurations.
Cognition, 69, B1-B9.
Afternoon session (45 minutes)
Further elaboration on a experimental methods, demonstrations, and
discussion
Title Assimilation and Contrast Lecturer: Charles de Weert
Contents An overview
on assimilation and contrast effects will be given with special
attention to the influence of organisational aspects on assimilation and contrast.
Reference:
Ch.M.M. de Weert and A.H.W.van Kruysbergen. (1987). Subjective contour strength and
perceptual superimposition:
transparency as a special case. In "Perception of illusory
contours" .S.Petry and G.meyer(eds),Springer, 165-170
Ch.M.M. de Weert (1991) Assimilation versus
Contrast , in A.Valberg en B.Lee (eds),' From Pigments to
Perception',Plenum. New York, 1991,305-311
Ch.M.M.de Weert and L.Spillmann(1995), Assimilation: asymmetry between
brightness and darkness. Vision Research , 35,1413-1420
Ch.M.M. de Weert and A.W.H.van kruysbergen (1997). Assimilation:
central and peripheral effects. Perception, 26,1217-1224
Additional Readings
Van Lier, R., & Wagemans J. (1997). Perceptual grouping measured by color
assimilation: Regularity versus Proximity. Acta Psychologica, (Special issue:
‘Higher-level cortical processing of color’) 97, 37-70.
Afternoon session (45 minutes)
Further elaboration on a
experimental methods, demonstrations, and discussion
Title Gestalt-effects
measured in binocular rivalry conditions. Lecturers: Charles de Weert and Rob van Lier
Contents
In this lecture special attention will be given
to interocular gestalt formation, based on colour or form, as can be measured
in dichoptic presentations.
Reference:
Van Lier, R. & De Weert, Ch. (2003). Intra- and Interocular activations
during dichoptic suppression. Vision Research, 43, 1111-1116.
Charles M.M. de Weert, Peter
R.Snoeren and Arno Koning (2004). Interactions
between binocular rivalry and Gestalt formation. In preparation for Vision
Research.
Additional Readings
Charles M.M. de Weert:
Interocular gestalt formations
Afternoon session (45 minutes)
Further elaboration on a
experimental methods, demonstrations, and discussion
More specifically, experiments in colour-form gestalt rivalry.