This article reviews various procedures used in the analysis of circadian rhythms at the
populational, organismal, cellular and molecular levels. The procedures range from visual …

Everyday scenes often contain sets of similar objects. Perceptual representations may
summarize these with statistical descriptors. After determining the psychological mean of two …

The details of oriented visual stimuli are better resolved when they are horizontal or vertical
rather than oblique. This “oblique effect” has been confirmed in numerous behavioral …

This review examines the isotropy of the perception of spatial orientations in the haptic
system. It shows the existence of an oblique effect (ie, a better perception of vertical and …

This paper examines how observers estimate the overall orientation of spatially
disorganised textures containing variable orientation. Experiments used asymmetrical …

Channel-based models of human spatial vision require that the output of spatial filters be
pooled across space. This pooling yields global estimates of local feature attributes such as …

While humans are very reliable (ie give highly reproducible answers) when repeatedly
judging the direction of a moving random-dot pattern (RDP) we find that their accuracy (ie …

The aim of this study was to examine the effect of body and head tilts on the haptic oblique
effect. This effect reflects the more accurate processing of vertical and horizontal …

This paper examines the role of spatial frequency and orientation tuned channels in the
perception of visual symmetry. Subjects discriminated between band-pass filtered, white …

We examine the mechanism that subserves visual contour detection and particularly its
tuning for the spatial frequency of contour components. We measured the detection of …