Editing Developmental psychology (section)

===Critical periods of development===
There are [[critical period]]s in infancy and childhood during which development of certain perceptual, sensorimotor, social and language systems depends crucially on environmental stimulation.<ref name="Siegler">{{Cite book | vauthors = Siegler R |year=2006 |title=How Children Develop, Exploring Child Development Student Media Tool Kit & Scientific American Reader to Accompany How Children Develop |location=New York |publisher=Worth Publishers |isbn=978-0-7167-6113-6}}</ref> [[Feral child]]ren such as [[Genie (feral child)|Genie]], deprived of adequate stimulation, fail to acquire important skills and are unable to learn in later childhood. In this case, Genie is used to represent the case of a feral child because she was socially neglected and abused while she was just a young girl. She underwent abnormal child psychology which involved problems with her linguistics. This happened because she was neglected while she was very young with no one to care about her and had less human contact. The concept of critical periods is also well-established in [[neurophysiology]], from the work of [[David H. Hubel|Hubel]] and [[Torsten Wiesel|Wiesel]] among others. Neurophysiology in infants generally provides correlating details that exists between neurophysiological details and clinical features and also focuses on vital information on rare and common neurological disorders that affect infants'''''.'''''

====Developmental delays====
Studies have been done to look at the differences in children who have developmental delays versus typical development. Normally when being compared to one another, mental age (MA) is not taken into consideration. There still may be differences in developmentally delayed (DD) children vs. typical development (TD) behavioral, emotional and other mental disorders. When compared to MA children there is a bigger difference between normal developmental behaviors overall. DDs can cause lower MA, so comparing DDs with TDs may not be as accurate. Pairing DDs specifically with TD children at similar MA can be more accurate. There are levels of behavioral differences that are considered as normal at certain ages. When evaluating DDs and MA in children, consider whether those with DDs have a larger amount of behavior that is not typical for their MA group. Developmental delays tend to contribute to other disorders or difficulties than their TD counterparts.<ref>{{cite journal | vauthors = Caplan B, Neece CL, Baker BL | title = Developmental level and psychopathology: comparing children with developmental delays to chronological and mental age matched controls | journal = Research in Developmental Disabilities | volume = 37 | pages = 143–151 | date = February 2015 | pmid = 25498740 | pmc = 4314378 | doi = 10.1016/j.ridd.2014.10.045 }}</ref>