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The most commonly observed features of 16p11.2 deletion syndrome are global developmental delay and psychiatric or behavioral issues, though severity varies significantly. Most people with the deletion don't have intellectual disability , but many have learning disabilities .
Developmental disability is a diverse group of chronic conditions, comprising mental or physical impairments that arise before adulthood. Developmental disabilities cause individuals living with them many difficulties in certain areas of life, especially in "language, mobility, learning, self-help, and independent living". [1]
Developmental delay is prevalent in approximately 1-3% of children under the age of 5 worldwide. [5] According to a systematic analysis done for a conducted study in 2016, there are approximately 52.9 million children worldwide under the age of 5 that are affected by some type of developmental delay or delayed milestone.
Global developmental delay is an umbrella term used when children are significantly delayed in two or more areas of development. It can be diagnosed when a child is delayed in one or more milestones, categorised into motor skills , speech , cognitive skills, and social and emotional development. [ 1 ]
Many parents don't raise concerns about their children. Those with limited education often do not know that primary care providers are interested in development and behavior, child-rearing, etc. Many informal questions to parents do not work well. For example, "Do you have worries about your child's development?" What is wrong with that question.
Research in developmental neuropsychology can generally be divided into two categories that are based on two main goals of the field: educational and clinical.The educational approach aims to understand and aid in the education of developing children (or in some cases adults) whom have deficits learning certain skills, most commonly language related – reading and writing.
The scientific study of the causes of developmental disorders involves many theories. Some of the major differences between these theories involves whether environment disrupts normal development, if abnormalities are pre-determined, or if they are products of human evolutionary history which become disorders in modern environments (see evolutionary psychiatry). [5]
In the behavioral model, development is considered a behavioral change. It is dependent on the kind of stimulus and the person's behavioral and learning function. [5] Behavior analysis in child development takes a mechanistic, contextual, and pragmatic approach. [6] [7]