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Biomedical subjects

D Muir

Publications and source records attributed to D Muir.

32 records · Page 2Linked to original sources
PubMed1979

Newborn infants orient to sounds.

In 2 experiments, the majority of 21 newborn infants who were maintained in an alert state consistently turned their heads toward a continuous sound source presented 90 degrees from midline. For most infants this orientation response was rather slow, taking median latencies of 2.5 sec to begin and 5.5 sec to end. The most important factors in producing this impressive response seem to be the method of holding the infants during testing and the nature of the auditory stimulus.

Acoustic Stimulation↗
PubMed1978

Intrapartum fetal asphyxia: a preliminary report in regard to long-term morbidity.

This is a preliminary report of a prospective follow-up study of 42 infants who had episodes of intrapartum fetal asphyxia at delivery identified by an acid-base assessment and a control group of 69 babies who had no evidence of intrapartum fetal asphyxia. The newborn infants were mature at delivery. There were no major neurologic disabilities in the asphyxia group. The pattern of physical growth and the mental and physical development indices of the babies of the asphyxia group were similar to those of the control group babies at 12 months of age. Results have not as yet indicated that the mature fetus with at least a terminal episode of asphyxia will exhibit evidence of handicap due to central nervous system injury.

Asphyxia Neonatorum↗
PubMed1978

Intrauterine growth retardation: a preliminary report of long-term morbidity.

This is a preliminary report of a prospective follow-up study of 88 intrauterine growth-retarded (IUGR) babies and a control group of 97 babies with weights appropriate for gestational age. The characteristic clinical features of IUGR pregnancies were observed in the obstetric patients of the IUGR group. The babies of the IUGR group have a phase of accelerated growth during the 3 months following delivery although they continue to be smaller than the babies of the control group at 12 months of age. No major neurologic abnormalities have been noted in the IUGR babies although behavioral differences were observed during the neonatal period and at 12 months of age. There were lower mental and physical development indices at 12 months of age which were due to the IUGR babies of lowest birth weight and those with a low maternal urinary estrogen index.

Asphyxia Neonatorum↗
PubMed1976

Responses of infants to visually presented objects.

The reaching behavior of some 60 infants between 7 and 23 days of age was studied. Contrary to some other reports, the infants did not respond differently to a visually presented, graspable, solid object than to its two-dimensional representation.

Child Behavior↗
PubMed1976

Behavioural compensation of cats after early rotation of one eye.

Two cats, each with one eye surgically rotated by about 90, were trained (by two different behavioural methods) to discriminate horizontal from vertical stripes using the normal eye alone. When they had mastered the discrimination, the normal eye was occluded and the rotated eye was tested for transfer with neither stimulus reinforced. Both cats responded immediately and consistently to the same stimulus that they had learned to choose with the normal eye. These animals seem to have adapted to eye-rotation not only in terms of spatial localization but also in terms of the recognition of the orientation of contours. These behavioural compensations cannot be accounted for by simple changes in the organization of the visual cortex.

Adaptation, Physiological↗