ISSN:0163-9641    

DOI:10.1002/1097-0355(198523)6:3<115::AID-IMHJ2280060302>3.0.CO;2-O

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1985

数据来源: WILEY

摘要:

AbstractThe developmental organization of spontaneous head positioning over the first 9 postnatal months of life was investigated in a study of 35 infants. Head positions assumed by infants while at rest were recorded at 11 observation period: at 1 week, 2 weeks, 4 weeks of age, and every 4 weeks thereafter until the infant was 36 weeks old. Results indicated an overall tendency toward a head‐right position, which was strongest during the neonatal period, but declined with age. The head‐right position bias was qualified by familial handedn

ISSN:0163-9641    

DOI:10.1002/1097-0355(198523)6:3<117::AID-IMHJ2280060303>3.0.CO;2-F

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1985

数据来源: WILEY

摘要:

AbstractHead orientation was investigated in a longitudinal study of 37 infants, who were observed at ages 2, 4, 8, and 12 weeks, during a 60‐second period that followed each of four (60 second) midline or lateral holds. When newborn, the infants tended to lie with their heads to the right, but this bias weakened over the first 3 postnatal months. This rightward motor bias was constrained further by such factors as sex and holding position; both factors had their strongest effect at 8 weeks. Finally, evidence was found for behavioral reorganization of postural orientation such that head orientation was less influenced by prior head positioning after than prior to 8 week

ISSN:0163-9641    

DOI:10.1002/1097-0355(198523)6:3<126::AID-IMHJ2280060304>3.0.CO;2-E

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1985

数据来源: WILEY

摘要:

AbstractThe relationship between infant state and head orientation after the head is held in a midline or lateral position was investigated longitudinally in infants 2, 4, 8, and 12 weeks of age. Across the four ages, there was a general decrease in the amount of time spent in an active‐awake state, whereas the amount of time spent crying remained fairly stable. Overall, infants turned more often to the right than to the left, but this difference was more pronounced when the infants were quietly alert or active‐awake than when they were crying. The results thus indicate that state variables influence the expression of headorientation biases in early infa

ISSN:0163-9641    

DOI:10.1002/1097-0355(198523)6:3<137::AID-IMHJ2280060305>3.0.CO;2-7

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1985

数据来源: WILEY

摘要:

AbstractStepping movements were investigated for evidence of early motor asymmetry in 24 familial right‐handed infants and 14 familial left‐handed infants at each of five ages: 2–3 days after birth, 14 days, and 1, 2, and 3 months of age. Results indicated a nonsignificant right leg advantage during the newborn period, with few significant lateral preferences evidenced in either direction at later testing ages. These results fail to indicate that a reliable leg preference persists beyond the newborn period, particularly among familial right‐handed infants. Thus, it seems unlikely that an asymmetry in stepping movements during early infancy marks the beginning of a direct developmental path that culminates in a motor asymmetry in later ch

ISSN:0163-9641    

DOI:10.1002/1097-0355(198523)6:3<145::AID-IMHJ2280060306>3.0.CO;2-9

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1985

数据来源: WILEY

摘要:

AbstractThe development of hand preference in infancy was investigated longitudinally by using a visually‐directed reaching task. Thirty‐two infants, equally divided into groups of familial right‐ and left‐handed boys and girls, were tested every 3 weeks from 24 to 39 weeks of age and once again at 52 weeks. Group trends for the development of hand preference were differentiated by familial handedness and sex of the infant. At all ages, test object position (to the infant's right or left) strongly influenced the hand used for reaching. Marked variability both between and within infants demonstrated an instability of early hand preference, an effect that could be appreciated fully only with a prospective longitudinal design. The results thus suggest that the development of hand preference for reaching is highly variable, discontinuous, and related to the interaction of sex and familial han

ISSN:0163-9641    

DOI:10.1002/1097-0355(198523)6:3<158::AID-IMHJ2280060307>3.0.CO;2-X

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1985

数据来源: WILEY

摘要:

AbstractAs part of a longitudinal study of the consequences of high risk birth, 66 infants born to right‐handed parents were given two unimanual tasks at 24 months of age to assess their hand preference. The 66 infants had been assigned to one of four diagnostic categories at birth: Premature with no postnatal medical complications; premature and having experienced respiratory distress; term and having experienced birth asphyxia during labor and delivery; term with normal delivery and postnatal course. Results of the handedness tasks revealed an increased incidence of use of the left hand among the term infants who underwent birth asphyxia and among the healthy preterm infants. The data indicate that timing of birth stress may play an important role in the ontogeny of pathological left‐handedn

ISSN:0163-9641    

DOI:10.1002/1097-0355(198523)6:3<175::AID-IMHJ2280060308>3.0.CO;2-0

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1985

数据来源: WILEY

ISSN:0163-9641    

DOI:10.1002/1097-0355(198523)6:3<::AID-IMHJ2280060301>3.0.CO;2-X

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1985

数据来源: WILEY