Keynote lectures

Akiyoshi KITAOKA, web page
Ritsumeikan University, Japan

Two types of spatial color mixtures and color illusions

There are two types of spatial color mixtures in vision as well as in displays. The additive color mixture follows the highest luminance rule whereas the subtractive one conforms to the lowest luminance rule. A close relationship to a variety of color illusions including the Munker illusion is pointed out. The histogram equalization hypothesis (Shapiro, Hedjar, Dixon and Kitaoka 2018) on the color illusion depending on the additive color change is also discussed.

Examples are shown in the webpage.


Kai Ruggeri, Columbia University, USA



The rapid growth in using psychological insights to influence public policy continues globally. Much of this work involves linking validated interventions from experimental behavioral sciences to macro-level issues identified from large-scale data sources. We evaluated mental health outcomes for 21 countries in Europe before and after the economic crisis using the European Social Survey, linking areas of concern to behavioral interventions. As Serbia did not participate in collecting those data, we attempted to replicate the methods for mental health and three behavioral interventions based on nudging (encouraging optimum choices without mandating them) and boosting (eliciting improved choices through informing and training). Insights indicate that profiles of risk and decision-making under uncertainty are strong predictors of mental health outcomes in Serbia.


Kai Ruggeri is an Assistant Professor in the Department of Health Policy and Management at Columbia University. His research is on how utilizing behavioral insights across populations can inform policies to improve well-being. He received his PhD in psychology from Queen’s University, Belfast. He was previously the director of the Policy Research Group in the Department of Psychology at the University of Cambridge, where he remains a Senior Fellow in the Judge Business School and a Fellow of Corpus Christi College.