The C-section experience.
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Cesarean Section↗
Biomedical subjects
A Hallum
Publications and source records attributed to A Hallum.
Reading comprehension performance and laterality: evidence for concurrent validity of dichotic, dichhaptic and EEG laterality measures.
EEGs were recorded while 55 boys read and answered questions about passages. Concurrent validity between parietal alpha ratios obtained from these recordings and dichotic/dichhaptic scores supports their utility as measures of lateral processing. The evidence was particularly strong between right hand advantage for dichhaptically presented sequential patterns and left hemispheric activity while answering. Results also indicate that coefficients for dichotically presented digits and alpha ratios during silent reading are indices of receptive laterality and measure the deployment of lateral structures rather than degree of structural laterality. This supports a dynamic rather than static model of lateral processing during receptive language.
Alpha Rhythm↗
Effects of approximation on postural sway in healthy subjects.
The effect of approximation on the postural sway of healthy subjects wearing a weighted belt around their pelvis was measured. Twenty subjects between the ages of 23 and 30 years stood on a polyurethane foam platform that amplified their postural sway and were filmed from a lateral view. All subjects wore markers over their mandibles, hips, and knees and were filmed three times with the weighted belt worn on a randomly selected trial. Frames from a 10-second interval of film from each trial were studied, and the summed displacement at each bony landmark between each frame of film was calculated. A significant decrease in displacement at the mandible (p less than .02) was found when the weighted belt was worn. The decrease in displacement was not significant at the hip or knee. Approximation was shown to decrease the postural sway of healthy subjects. Further study is indicated to investigate the effect of approximation on patient populations.
Adult↗
Development of the lateral equilibrium reaction in stance.
The lateral equilibrium reaction in stance was assessed in 80 normally developing children aged from nine months to five years. A scoring system and checklist were devised to describe the character and presence of the reaction. The earliest non-functional response was seen at nine months of age, and no functional response was observed to both sides until after two years of age. A progressive increase in functional response to both directions of tilt occurred between 12 and 18 months, with an unexpected drop at 21 and 24 months. All three-year-old and five-year-old children demonstrated a functional response to both sides. The lower extremity pattern was the most consistent component observed in those with a functional response. Individual variations in movements of the trunk, upper extremities and head excluded any indication of developmental patterns for these body segments. The clinical implications of these results are discussed.
Child Development↗
Normal ranges of hip motion of infants between nine and 24 months of age.
The means and standard deviations were obtained for hip extension limitation, internal rotation, external rotation and abduction at nine, 12, 18 and 24 months of age from a sample of 86 normal, healthy children. Statistically significant changes were found for three of the four motions tested. Hip extension limitation decreased from 10 degrees at nine months to 3 degrees at 24 months. At nine months external rotation was greater than internal rotation in all cases, but with increasing age the mean values for the two motions began to approximate each other. There was a statistically significant positive correlation between infants with the greatest hip extension limitation and the degree of external rotation. There was also a significant negative correlation between the least hip extension limitation and greater abduction.
Child Development↗