DIFFERENTIAL DEVELOPMENTAL PROCESS OF RESPECTIVE BEHAVIORAL STATES INHUMAN FETUSES

Citation
S. Kozuma et al., DIFFERENTIAL DEVELOPMENTAL PROCESS OF RESPECTIVE BEHAVIORAL STATES INHUMAN FETUSES, American journal of perinatology, 15(3), 1998, pp. 203-208
Citations number
15
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Pediatrics
ISSN journal
0735-1631
Volume
15
Issue
3
Year of publication
1998
Pages
203 - 208
Database
ISI
SICI code
0735-1631(1998)15:3<203:DDPORB>2.0.ZU;2-H
Abstract
The presence of behavioral states has been recognized in human fetuses . However, developmental process of fetal behavioral states remains to be clarified. In thirty-one normal pregnant women between 20 and 41 w eeks' gestation, fetal movements were examined by using multiple ultra sonic machines. The entire period was divided into eye movement (EM), no eye movement (NEM), and unclassified periods according to the mode of appearance of rapid eye movements. We investigated changes in the r atio of EM and NEM periods and the incidence of various fetal movement s in these periods. The ratio of EM periods increased stepwise between 20 and 32 weeks. The difference in the incidence of ''startle'' and j aw movements between EM and NEM periods was found at 24-27 and 32-35 w eeks, respectively. We found a significant decrease in the incidence o f total body movements exclusively in NEM periods at 36-39 weeks and a significant increase in the incidence of ''rolling'' in EM periods at 40-41 weeks. Eye opening was ultrasonographically recognized, providi ng evidence for awake state in the human fetus. This study revealed th e characteristic appearance of fetal movements as related to the prese nce or absence of EM during the second half of pregnancy, and thereby pointed to differential development process of behavioral states of hu man fetuses.