Comparing compliance patterns between randomized treatments
Developing indicators for European birds.
Published in Philosophical transactions of the Royal Society of London. Series B, Biological sciences
The global pledge to deliver 'a significant reduction in the current rate of biodiversity loss by 2010' is echoed in a number of regional and national level targets. There is broad consensus, however, that in the absence of conservation action, biodiversity will continue to be lost at a rate unprecedented in the recent era. Remarkably, we lack a ba...
Meta-analysis: some clinical and statistical contributions in several medical disciplines.
Published in Yonsei medical journal
Meta-analysis in its present form of statistically integrating information from several studies all with a common underlying theme has been around for over 25 years. The medical field has seen many attempts by many investigators to pull summary data together from various sources within a discipline with the goal of making some definitive statement ...
Modeling group fMRI data.
Published in Social cognitive and affective neuroscience
The analysis of group fMRI data requires a statistical model known as the mixed effects model. This article motivates the need for a mixed effects model and outlines the different stages of the mixed model used to analyze group fMRI data. Different modeling options and their impact on analysis results are also described.
Spatial ensemble statistics are efficient codes that can be represented with reduced attention.
Published in Proceedings of the National Academy of Sciences of the United States of America
There is a great deal of structural regularity in the natural environment, and such regularities confer an opportunity to form compressed, efficient representations. Although this concept has been extensively studied within the domain of low-level sensory coding, there has been limited focus on efficient coding in the field of visual attention. Her...
Seeing the mean: ensemble coding for sets of faces.
Published in Journal of experimental psychology. Human perception and performance
We frequently encounter groups of similar objects in our visual environment: a bed of flowers, a basket of oranges, a crowd of people. How does the visual system process such redundancy? Research shows that rather than code every element in a texture, the visual system favors a summary statistical representation of all the elements. The authors dem...
Choice of Summary Statistic Weights in Approximate Bayesian Computation
Published in Statistical Applications in Genetics and Molecular Biology
In this paper, we develop a Genetic Algorithm that can address the fundamental problem of how one should weight the summary statistics included in an approximate Bayesian computation analysis built around an accept/reject algorithm, and how one might choose the tolerance for that analysis. We then demonstrate that using weighted statistics, and a w...
A conceptual framework of computations in mid-level vision.
Published in Frontiers in computational neuroscience
If a picture is worth a thousand words, as an English idiom goes, what should those words-or, rather, descriptors-capture? What format of image representation would be sufficiently rich if we were to reconstruct the essence of images from their descriptors? In this paper, we set out to develop a conceptual framework that would be: (i) biologically ...
A conceptual framework of computations in mid-level vision
If a picture is worth a thousand words, as an English idiom goes, what should those words-or, rather, descriptors-capture? What format of image representation would be sufficiently rich if we were to reconstruct the essence of images from their descriptors? In this paper, we set out to develop a conceptual framework that would be: (i) biologically ...
The hierarchical sparse selection model of visual crowding.
Because the environment is cluttered, objects rarely appear in isolation. The visual system must therefore attentionally select behaviorally relevant objects from among many irrelevant ones. A limit on our ability to select individual objects is revealed by the phenomenon of visual crowding: an object seen in the periphery, easily recognized in iso...
