Human listeners can segregate sound sources based on differences in frequency content and timing. In addition, spatial separation has been shown to improve this ability. The work presented here is an attempt to characterise the effect of spatial factors on segregation when other distinguishing factors are either unavailable or unreliable. This is relevant to understanding how the auditory syste...

The article examines the complex relationships among the sociological concept of socio-spatial segregation, urban poverty and health promotion, suggesting research topics that could contribute to a detailed analysis of the Brazilian social reality within the public health context, underpinning decisions on healthcare. Initially, the main aspects of the social division problems in major cities a...

A mathematical model is proposed which describes the dynamics and the spatial distributions of two population groups, where migration is driven by considerations of socioeconomic status. The model associates segregation with instabilities of spatially uniform mixed population states. These instabilities lead to a wide range of segregation forms including: (a) variable (weak) segregation where t...

We investigated two types of spatial resolution for perceiving motion-defined contours: grating acuity, the capacity to discriminate alternating stripes of opposed motion from transparent bi-directional motion; and alignment acuity, the capacity to localize the position of motion-defined edges with respect to stationary markers. For both tasks the stimuli were random noise patterns, low-pass fi...

Receptor-ligand couples in the cell-cell contact interface between a T cell and an antigen-presenting cell form distinct geometric patterns and undergo spatial rearrangement within the contact interface. Spatial segregation of the antigen and adhesion receptors occurs within seconds of contact, central aggregation of the antigen receptor then occurring over 1-5 min. This structure, called the i...