Electronic displays and computer systems offer numerous advantages for clinical vision testing. Laboratory and clinical measurements of various functions and in particular of (letter) contrast sensitivity require accurately calibrated display contrast. In the laboratory this is achieved using expensive light meters. We developed and evaluated a novel method that uses only psychophysical respons...

Intertemporal and probabilistic choices have been attracting attention in behavioral neuroeconomics. Although recent advances in neuroeconomics demonstrated neural processes underlying intertemporal and probabilistic choices, the roles of psychophysical effects on the choices have largely been understudied. In this paper, we review the roles of psychophysical effects in time and risk attitudes....

BACKGROUND Measurement of camouflage performance is of fundamental importance for military stealth applications. The goal of camouflage assessment algorithms is to automatically assess the effect of camouflage in agreement with human detection responses. In a previous study, we found that the Universal Image Quality Index (UIQI) correlated well with the psychophysical measures, and it could be ...

We present a psychophysical and analytical framework for the comparison of the performance of different analytical measures of motion activity in video segments with respect to a subjective ground truth. We first construct a test-set of video segments and conduct a psychophysical experiment to obtain a ground truth for the motion activity. Then we present several low-complexity motion activity ...

Psychophysical research on text legibility has historically investigated factors such as size, colour and contrast, but there has been relatively little direct empirical evaluation of typographic design itself, particularly in the emerging context of glance reading. In the present study, participants performed a lexical decision task controlled by an adaptive staircase method. Two typefaces, a ...

BACKGROUND The neural basis of timing remains poorly understood. Although controversy persists, many lines of evidence, including studies in animals, functional imaging studies in humans and lesion studies in humans and animals suggest that the basal ganglia are important for temporal processing [1]. METHODOLOGY/PRINCIPAL FINDINGS We report data from a wide range of timing tasks from two subj...

We utilize a model of motion perception to link a physiological study of feature attention in cortical motion processing to a psychophysical experiment of motion perception. We explain effects of feature attention by modulatory excitation of neural activity patterns in a framework of biased competition. Our model allows us to qualitatively replicate physiological data concerning attentional mod...

This article presents a theory of the relationship of the psychological and the physical and uses it to formulate a new kind of meaningfulness principle for psychophysical application. This new principle calls into question the psychological relevance of many kinds of quantitative psychophysical relationships. As an illustration, it is used to study comparisons of sensitivity involving Weber fr...

The major types of models that have been proposed to account for the psychophysical data that are obtained when the stimulus differences are small are described briefly. Because it is clear that contingency variables, such as presentation schedules and payoffs, as wet1 as the physical stimuli affect the response probabilities, recent models have included a trial dependent decision mechanism in ...