What is complexity, and how should it be studied mathematically? In the interpretation that we adopt, there are several underlying common themes to complexity theories. The basic ground rules are these: There is a family F of some mathematical objects under consideration. The elements of some subset S ⊆F are deemed simple. Also, there are certain composition rules that allow one to put together...

Background: Attachment style is the pattern of an individual in forming relationships with others, which is believed to be determined in the early years of life. Maternal-fetal attachment (MFA) is a term used to describe the relationship between a pregnant woman and her fetus. Qualitative descriptions of maternal attitudes and adaptation to pregnancy indicate that MFA is based on cognitive repr...

This review focuses on the errors that children with developmental language impairments make on three types of word production tasks: lexical retrieval, the elicitation of derivationally complex forms and the repetition of non-sense forms. The studies discussed in this review come principally from children with specific language impairment, and from children who are English-speakers or deaf use...