PubMed Health⌕ Search

Biomedical subjects

R E Lasky

Publications and source records attributed to R E Lasky.

At least 55 records · Page 3Linked to original sources
PubMed1982

The effect of early contact on maternal perception of infant behavior.

The effect of extra maternal-infant contact during the first postpartum hour on maternal perception of infant behavior one month after delivery was measured by the Broussard Neonatal Perception Inventories and the attachment questions of Klaus and colleagues. All mothers were indigent primiparas who vaginally delivered normal, term infants. 60 mother-infant dyads were randomly assigned to either an extra contact or routine contact group. 49 mothers were available 1 month later for home visits. Scores on the Neonatal Perception Inventories were not significantly affected by either degree of contact or the sex of the child. There was also no difference between contact groups in the maternal response to the attachment questions. Infant behaviors recorded by 24 mothers during the 4 days following home visits were similar in the 2 contact groups. Mothers reported significantly more negative behaviors for female than for male infants. Any effects of extra contact during the first hour after birth on maternal-infant interaction are unlikely to result from changes in maternal perception of infant behavior.

Adolescent↗
PubMed1982

Temporal masking of auditory evoked brainstem responses in human newborns and adults.

Temporal masking effects on brainstem evoked responses (BERs) were studied in normal human newborns and adults. Forward masking prolonged the latencies of the newborn BERs significantly longer than adult BERs. The effect of backward masking on BER latencies for both newborns and adults was small, suggesting that either backward masking effects for these stimuli are mediated by structures rostral to the brainstem or that backward masking does not affect the latency of the BER. Increasing the duration of the forward masker prolonged BER latencies more for newborns than adults. Increasing the intensity of the masker prolonged BER latencies for both newborns and adults, however, there were no significant age-intensity interactions.

Acoustic Stimulation↗
PubMed1981

The relationship between physical growth and infant behavioral development in rural Guatemala.

The present study investigated the relationship between a number of anthropometric indices and behavioral development during the first 2 years of life in rural Guatemala. Length and weight were the indices most strongly correlated with behavioral development. If the effect of the infant's length and weight was statistically controlled for, none of the other anthropometric variables explained a significant proportion of the variance in behavioral development. Controlling the length (or weight) assessed at the same age as the behavioral assessment, length (or weight) for younger ages was not significantly correlated with behavioral development. Changes in length or weight over time correlated with changes in behavioral performance. We were unable to explain the association between physical growth and behavioral development by a number of variables including gestational age, nutrient intake, prevalence of disease, and familial characteristics.

Body Height↗
PubMed1981

The predictive validity of infant assessments in rural Guatemala.

The behavioral development of rural Guatemalan infants was assessed shortly after birth on a Neonatal Assessment Scale (NAS) and at 6, 15, and 24 months of age on a Composite Infant Scale (CIS). Summary variables based on NAS performance poorly predicted later assessed performance even as recently as 6 months after birth. The CIS was modestly correlated with later performance (between 3 and 7 years of age). These results are similar to those concerning samples from developed nations. Summary variables reflecting failure of easy items, the items most strongly predictive of 4-year performance, and the first principal component factor score all were highly correlated with each other. Of the variables generated they had the most predictive validity. A motor item variable had at least as impressive predictive validity as the mental items at 6 and 15 months. By 24 months the mental variable was a better predictor than the motor variable. In terms of predicting later performance, there seemed to be little justification for weighting items other than to achieve a characterization of overall performance.

Child↗
PubMed1980

The processing of tachistoscopically presented visual stimuli by five-month-old infants.

5-month-old infants were presented visual patterns for 100 msec followed by a 100-msec patterned masker at intervals of 0, 250, 500, and 2,000 msec after the offset of the stimulus. This procedure was repeated 45 times. Only infants in the 2,000-msec stimulus-masker interval condition significantly fixated a novel stimulus longer than the familiar stimulus. These results suggest that visual processing in infants is quite slow relative to that in older humans.

Humans↗
PubMed1979

What is politics?

Explore the source record for details and available documents.

Dentistry↗
PubMed1979

Serial habituation or regression to the mean?

The serial habituation hypothesis states that the order that infants fixate and habituate to component features of a complex form is determined by the salience of those features. Infants' fixation of the most salient feature of a complex form is reduced after exposure to that complex form, supporting the serial habituation hypothesis. Regression to the mean can also explain this result. In the present study, 4-month-olds were either presented with a complex form containing the relevant feature, or they were presented with another complex form lacking that feature. If the reduction in fixation to the most salient feature is due to the presentation of the complex form, then a reduction in fixation should only be observed in the condition in which the complex form containing that feature was presented. A reduction was observed in both conditions supporting a regression to the mean interpretation of the data.

Female↗
PubMed1977

The effect of visual feedback of the hand on the reaching and retrieval behavior of young infants.

Reaching and retrieving, with and without visual feedback of the hand, were observed in 50 infants ranging in age from 2 1/2 to 6 1/2 months. Failure, to see the hand did not completely inhibit reaching and retrieving, although reaching and retrieving were reduced in this situation for infants 5 1/2 months and older. It was hypothesized that infants of this age expected to see their hands within their visual fields. When this expectation was not met, the infant's ongoing behavior was disrupted.

Age Factors↗