INTRODUCTION We describe seven cases of patients with an inability to cry after treatment with selective serotonin re-uptake inhibitor (SSRI) medication, even during sad or distressing situations that would have normally initiated a crying episode, in the light of the role of the serotonergic system in emotional expression. METHOD Case series drawn from patients attended in a secondary care p...

Maynard et al. (2007) related mortality with ambient particulate black carbon (BC) and sulfate (SO 4). They also associated SO 4 in Boston, Massachusetts, with " secondary, " distant " coal combustion. " Their correlation of 0.44 between BC and SO 4 , however, suggests the importance of local source(s) of SO 4 , including vehicle exhaust (especially diesel). Centrally monitored BC poorly charac...

In this paper we present an efficient data structure and algorithms for GPU ray tracing of secondary effects like reflections, refractions and shadows. Our method extends previous work on layered depth cubes in that it uses layered depth cubes as an adaptive space partitioning scheme for ray tracing. We propose a new method to efficiently build LDCs on the GPU using geometry shaders available i...