In visual search experiments there exist a variety of experimental paradigms in which a symmetric set of experimental conditions yields asymmetric corresponding task performance. There are a variety of examples of this that currently lack a satisfactory explanation. In this paper, we demonstrate that distinct classes of asymmetries may be explained by virtue of a few simple conditions that are ...

The focus of this study was to evaluate the gains and losses in visual search performance across the lifespan in a representative sample of 298 individuals ranging from 6 to 89 years of age. Adopting a lifespan developmental perspective, two general resource theories were considered: cognitive speed and inhibitory control. Participants searched computer displays to indicate the presence or abse...

objective: the purpose of this research was to study the cognitive functions in patients with methamphetamine-induced psychosis (mip) in comparison with schizophrenia patients and normal subjects. method: this was a cross-sectional study, 30 patients with mip, 30 patients with schizophrenia and 30 normal individuals were selected via convenient sampling and were matched on age, sex and educatio...