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|DOI=10.1016/0378-3782(82)90038-x
|accessdate=2020-11-14
}}</ref>
Porter, Miller & Marshall (1986) studied the nature of pain cries during circumcision. the cries during circumcision were found to shorter, with more more frequent vocalizations; higher peak fundamental frequencies; fewer harmonics; and greater variability of the fundamental. Adult listeners judged these cries to have an unusual degree of urgency.<ref name="porter1986">{{REFjournal
|last=Porter
|first=Fran Lang
|author-link=
|last2=Miller
|first2=Richard H.
|author2-link=
|last3=Marshal
|first3=Richard E>
|author3-link=
|etal=no
|title=Neonatal pain cries: effect of circumcision on acoustic features and perceived urgency
|trans-title=
|language=English
|journal=Child Dev
|location=
|date=1986-06
|volume=57
|issue=3
|pages=790-802
|url=https://www.jstor.org/stable/1130355?seq=1
|archived=
|quote=
|pubmedID= 3720404
|pubmedCID=
|DOI=
|accessdate=2020-11-15
}}</ref>