Native speech perception is generally assumed to be highly efficient and accurate. Very little research has, however, directly examined the limitations of native perception, especially for contrasts that are only minimally differentiated acoustically and articulatorily. Here, we demonstrate that native speech perception may indeed be more difficult than is often assumed, where phonemes are high...

Background and aims: Despite substantial advances in the etiology of autism spectrum disorder (ASD),the environmental risk factors have not yet been well understood. The present study investigated theassociation between ASD, and maternal and perinatal risk factors.Methods: This matched, case-control study was conducted in Hamadan, the west of Iran, fromNovember 2015 to M...

Background The aim of this study was to evaluate the hypothesis that infertility may result in a decrease in quality of life (QOL). MaterialsAndMethods In this case control study that carried out on 150 women with infertility and 150 women undergone TL as the control group. The participants were asked to fill out the Short Form Health Survey (SF-12) questionnaire, a generic instrument to measur...

There are several different definitions and kinds of case studies. Because of different reasons the case studies can be either single or multiple. This study attempts to answer when to write a single case study and when to write a multiple case study. It will further answer the benefits and disadvantages with the different types. The literature review, which is based on secondary sources, is ab...

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background  & aim: case-crossover  studies are the case-control  version of crossover studies. in these studies, cases and controls are the same subjects. the term crossover is applied for designs that all subjects pass through both treatment (exposure) and placebo (non-exposure) phases. in fact they are  crossover  of  subjects  between  periods  of  exposure  and  non-exposure.  this  design ...