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Yamamoto N - - 1990
In order to evaluate the influence of extrauterine life on auditory brainstem response in neonates, we performed serial ABR recordings twice a week in 10 preterm infants. A marked decrease of I-III interpeak latency was observed in 7 infants during the first 2 or 3 weeks after birth. Wave I ...
Finocchio D V - - 1990
We have developed a calibration procedure that combines the measurement of the EOG voltage with the concurrent assessment of the actual direction of gaze as revealed by the corneal reflection of a target light. Using this method, we have been able to calibrate the eye-position signal recorded from 2- and ...
Brown A M - - 1990
The recent literature on test threshold and color vision in human infants is critically reviewed. Test thresholds are higher in infants than in adults at the absolute threshold and at all adapting luminances, but approach adult values rapidly over the first six months of life. The spectral luminous efficiency function ...
Manny R E - - 1990
Two perpendicular square-wave gratings (i.e. plaids) were used to investigate motion coherence in 1-, 2- and 3-month-old infants. The direction of motion of the stimulus was judged by an adult observer, on the basis of the induced optokinetic nystagmus (OKN) in an eight-alternative eye movement voting paradigm. Infants as young ...
Bergamasco N H - - 1990
Ten male and five female neonates (median age, 43 h) were tested with sweet, sour, and bitter stimuli. Facial expressions were videotaped for at least 60 s and analyzed in order to 1) assess early discriminatory function, and 2) determine constancies in the components of facial expressions elicited by different ...
Sontheimer D - - 1989
The author examined the construct validity of visual information processing in infancy (preference for novel visual targets) as a predictor of later neurological outcome. 104 infants with definite (N = 25), questionable (N = 27) or no evidence of neurological dysfunction (N = 52) were tested at three to seven ...
van Hof-Van Duin J - - 1989
Behavioural visual functions were assessed in 155 very low birth weight (VLBW) infants during the first 12 months after expected term. Visual development was examined (mainly cross-sectionally) at 6 weeks, 3, 6, 9, and 12 months of corrected age by assessment of visual acuity, visual fields, optokinetic nystagmus and visual ...
Morrongiello B A - - 1989
Infants 5, 7, and 9 mo. of age were videorecorded while reaching for a dowel that either was stationary or changed orientation after initiation of a reach. Visual fixation and hand orientation were monitored throughout each reach, as was the efficiency with which infants contacted the stimulus. In reaching for ...
Stapells D R - - 1989
The auditory brain stem responses (ABRs) to 500- and 2,000-Hz bone-conducted (BC) tones were recorded from 48 infants with ears exhibiting various external and middle ear states (normal, otitis media, auditory meatal atresia). Amplitudes were greater, wave V latencies longer, and detectability better for responses to 500-Hz BC tones compared ...
Groenendaal F - - 1989
Visual development was assessed in 124 infants (112 preterms and 12 fullterms) who had suffered from perinatal hypoxia and in 55 control preterm infants during the first year of corrected age. Using behavioural techniques, visual functions were tested during follow-up visits in the Sophia Children's Hospital. Corrected ages at testing ...
Deorari A K - - 1989
Auditory brainstem evoked responses (ABER) were recorded to provide normative data regarding the latency values, brainstem conduction times in term neonates and infants up to 24 months of age. The mean latency for wave I - 1.86 +/- 0.11 m sec, wave III - 5.11 +/- 0.31 m sec, wave ...
Adams R J - - 1989
The visual habituation of two groups of newborn infants was tested at a mean age of 2.9 days with large achromatic squares of varying luminance. Mothers of the infants in one group received no medication during labour; mothers in the second group received a single dose of the synthetic narcotic ...
McPherson D L - - 1989
A series of 20 normal newborn term infants and 12 infants born to mothers who had abused opiates during pregnancy were studied. Auditory brainstem-evoked potentials were used to describe neurophysiologic dysfunction in a group of drug-addicted term infants. Significant differences in the auditory brainstem-evoked potentials were found between the two ...
Allen T D - - 1989
We present 3 cases in which a neonate had unilateral hydronephrosis associated with a ureter hypoplastic throughout its length. In all 3 infants the affected kidney failed to visualize on excretory urography and function of the kidney proved to be disappointing despite its relatively normal appearance on external examination. In ...
Scher M S - - 1989
Visual acuity, visual fields and neurological status were assessed in 10 infants with periventricular leukomalacia (PVL), tested at 16, 36, 48 and 72 weeks from the expected date of confinement. Monocular acuity development was normal in eight of the 10 infants, but was below normal in one infant at eight ...
Mercer M E - - 1989
We examined 3-mo.-old human infants' ability to detect flicker in 454-nm blue and 627-nm red lights at 1.5 log cd/m2. Infants showed the same critical flicker frequency (CFF) to both wavelengths, suggesting that retinal cones mediate the detection of flicker at this luminance level. Infants' CFFs for chromatic stimuli were ...
Drotar D - - 1989
The authors demonstrate a test of visual cognitive abilities (Fagan Test of Infant Intelligence) in the assessment and management of a ventilator-dependent infant with quadriplegia. Assessment of visual recognition memory indicated that the infant's cognitive development progressed normally, despite severe physical limitations and a prolonged stay in hospital. The results ...
Gwiazda J - - 1989
Visual acuity, the most basic measure of developing pattern vision in human infants, has been used extensively for detecting anomalies of vision and oculomotor coordination. In the past 10 years much has been learned about the development of two hyperacuities, namely, vernier acuity and stereoacuity. These two acuities become superior ...
Muir D W - - 1989
Research during the past 10 years on the neonatal head-turn response to off-centred rattle sounds is reviewed, and various procedural and stimulus conditions that influence the probability of eliciting a correct response are identified. Also, the existence of a U-shaped developmental function is confirmed in a cross-sectional study of 104 ...
Beckett P A - - 1989
The reduction in illusion magnitude with visual inspection and the transfer of such illusion decrement to a noninspected figure were examined in real- and subjective-contour Poggendorff figures. For both types of figures, illusion magnitude decreased significantly, and in a similar manner, during a 5-min inspection period. Postinspection tests showed that ...
Humphrey G K - - 1989
The research of the authors and others on the role of structure in infant visual pattern perception is reviewed. Two new experiments are reported on preference for symmetry in infants. It is shown that infants reliably prefer patterns with multiple axes of bilateral symmetry relative to asymmetrical patterns. Also, the ...
Dobson V - - 1989
Grating acuity and stereopsis were measured longitudinally in five groups of infants: infantile esotropes, moderate hyperopes, high hyperopes, infants with a family history of strabismus or amblyopia and controls. Grating acuity was measured with a forced-choice preferential looking procedure. Stereopsis was assessed with a random-element stereogram. Testing was conducted when ...
Ruff H A - - 1989
The purpose of this paper is to discuss the relationship between the haptic and visual systems during infant's bimodal interaction with objects. Four general topics are discussed: the role of exploratory activity in perception, the specific ways in which the two systems are related during exploration, developments over age in ...
Pryds O - - 1989
The latency and amplitude of N1, the first negative peak of single flash visual evoked cortical potentials (VEP) were evaluated in 86 preterm infants (25-34 weeks of gestation), investigated during the first day of life. All infants were regarded stable at the time of investigation and none had experienced severe ...
Stanley O H - - 1989
Vernier acuity was measured at 40 weeks post term in 18 infants born with symmetric intrauterine growth retardation (IUGR) and 32 normal (N) infants. Grating acuity was also measured in 12 IUGR and 26 N infants. The mean vernier detection threshold (V.min) was 0.4 octaves higher in the IUGR than ...
Rogers S H - - 1989
Middle latency auditory evoked responses (MLAERs) were measured in 21 normal term infants, three to five days after birth and then at 6 weeks, 7 months and 1 year of age. A polyphasic waveform was elicited during natural sleep in all infants at each recording session by monaural click stimulation ...
McPherson D L - - 1989
Binaural interactions in brain-stem auditory evoked potentials and in middle latency auditory evoked potentials were studied in 18 normal hearing adults and 10 normal term infants. Binaural interactions at the times of ABR waves V and VI were comparable in term infants and adults. Binaural interaction during the time domain ...
Sokol S - - 1989
Sensitivity for vertical and horizontal gratings is higher than for obliquely oriented gratings, a phenomenon known as the oblique effect. We compared visual evoken potential and preferential looking estimates of the oblique effect in nonastigmatic 3-month-old infants and found that orientation effects occurred more frequently by visual evoked potential measure ...
Searle C M - - 1989
Visual acuity was measured in both preterm and full-term infants by means of forced-choice preferential looking. The ages of infants tested ranged from one month to 12 months. The results of both groups were considered and compared in terms of natal and conceptional age. The data suggested that preterm infants ...
Brown A M - - 1989
A test spectral sensitivity curve was measured on 3-month-old human infants using a steady 8 degrees test light on a 580 nm adapting field. The data show a "Sloan" notch near 580 nm and a peak near 610 nm. The results are compared to standard nonopponent and opponent models of ...
Delorme A - - 1989
It has been demonstrated many times that the posture of infants is affected by movement of the visual environment. However, in previous studies, measurements taken with infants less than 10 to 12 months of age have always been recorded with the infants in a sitting position. An experiment is reported ...
Hansen R M - - 1989
The ocular media densities of eleven 10-week-old infants and of 10 adults were estimated from dark adapted thresholds measured using a two alternative forced choice preferential looking method. The estimated media density at 400 nm derived from these thresholds ranged from 0.55 to 1.00 (median 0.75) log units for infants, ...
Kyrios M - - 1989
Three infant cohorts from Greek cultural backgrounds were compared with an Anglo-Australian infant cohort across 9 dimensions of temperament using Australian and Greek versions of the revised Infant Temperament Questionnaire (Cazey and McDevitt 1978). Infants from a Greek cultural background were generally considered to be more 'difficult' than the Anglo-Australian ...
Casey B J - - 1988
Phases of infant visual attention were studied using a visual preference procedure that was modified to be similar to a "dual-task," interrupted stimulus procedure. Infants were tested in a cross-sectional design at 14, 20, or 26 weeks of age. The infants were presented with varying and complex TV patterns on ...
Clavadetscher J E - - 1988
The chromatic discrimination capabilities of 3- and 7-week-old infants were tested using 8 degrees, 417-, 448-, 486-, 540-, and 645-nm test fields embedded in a 547-nm surround and 486-nm test fields in a broadband red surround. In corroboration of earlier studies, few 3-week-old infants demonstrated chromatic discriminations, although their performance ...
Brock T G - - 1988
The development of the leaf-sheath pulvinus of oat (Avena sativa L. cv. Victory) was studied in terms of its competency to respond to gravistimulation. Stages of onset of competency, maximum competency and loss of competency were identified, using the length of the supertending internode as a developmental marker. During the ...
Stool S E - - 1988
Visualization and intubation of the larynx in the normal infant may be difficult, especially in a newborn who has a large tongue in relation to the size of the oral cavity and an oval epiglottis. There are a number of congenital and acquired conditions that virtually guarantee that establishment of ...
Colombo J - - 1988
The visual behavior of infants in the paired-comparison paradigm was assessed with multiple discrimination tasks week-to-week at 4 and 7 months and longitudinally from 4 to 7 months. Results indicated that although task-to-task reliability was extremely variable and typically low, most measures of infants' attention averaged across multiple tasks were ...
Moss M - - 1988
In 2 studies, the Range of State cluster derived from infants' scores on the Neonatal Behavioral Assessment Scale with Kansas Supplements (NBAS-K) was found to correlate significantly with visual discrimination performance at 3 months of age. Contrary to the expectation that NBAS-K orientation scores would predict visual discrimination at 3 ...
Olsho L W - - 1988
Pure-tone thresholds at frequencies ranging from 250 to 8000 Hz were estimated for 3-, 6-, and 12-month-old infants and for adults, using the Observer-based Psychoacoustic Procedure (OPP). Sounds were presented monaurally using an earphone. Psychometric functions of infants were similar to those of adults, although 3-month-olds had shallower functions at ...
Taylor M J - - 1988
Somatosensory evoked potentials (SEPs) provide neurologists with an assessment of the neuraxis from peripheral nerve to sensory cortex. Their value is particularly relevant in paediatric neurology as sensory clinical examination can be difficult in young infants and children. The clinical utility of SEPs, however, requires knowledge of the alterations in ...
Primus M A - - 1988
Experimental data show a discrepancy between adult auditory thresholds and best estimates of infant thresholds. The source of the discrepancy has not been determined. Attentional differences between infants and adults and procedural differences to accommodate infant attentional behavior may account at least in part for the discrepancy. A standard operant ...
Archer S M - - 1988
Normal infants ranging from newborn to 10 months of age were examined in order to study age-related variation in the behavior of the fundus reflexes seen in the course of performing the Brückner test. Most infants 8 months of age and older show the characteristic symmetric dimming of the fundus ...
Figlewicz D A - - 1988
In the course of development, corticocortical axons seem to first appear in a labile state from which they either mature into a stable state or are eliminated. These state transitions may be related to cytoskeletal modifications. By immunohistochemistry and immunobiochemistry we found that, in the corpus callosum of the cat, ...
Stapells D R - - 1988
Auditory middle latency and steady-state responses (MLR/SSRs) were recorded in normal infants (aged 3 weeks to 28 months) and adults. SSR amplitudes were maximum using stimulus presentation rates near 40 Hz in adults. By contrast, the infant data showed no consistent amplitude maximum across the rates tested (9-59 Hz). With ...
Pryds O - - 1988
Flash evoked cortical potentials (VEPs) were studied in 33 preterm infants with gestational ages from 27 to 33 weeks. During the first 12 h after birth a visual response was evoked in all infants. Better estimates of the VEP latency and amplitude were obtained by using the values of 3 ...
Nozza R J - - 1988
Binaural masked thresholds for a speech sound [ba] were estimated under two interaural phase conditions (NoSo and NoS pi) in three age groups (infants, preschool children, and adults). A computer-based head-turn with visual reinforcement procedure was used to test the infants. Preschoolers were tested using a modified play audiometry task, ...
Fulton A B - - 1988
Scotopic retinal function undergoes age-related changes early in human infancy. Electroretinographic psychophysical, and pupillographic responses have been used in the study of normal development. Various components of the electroretinographic responses index distal and proximal retinal function. Changes in pupillary diameter, measurable in infants under carefully selected conditions, represent rhodopsin regeneration ...
Bargones J Y - - 1988
Suppression tuning curves (STCs) for spontaneous otoacoustic emissions (SOAEs) were longitudinally obtained in seven infants (at 3 weeks, 2 months, and 3, 4, or 6 months of age) and in five adults. Excellent reproducibility was obtained for adult STCs. Reproducibility for infant STCs was poorer, but the curves at each ...
Gerber S E - - 1988
The usual paradigm employed for both clinical and experimental evaluation of auditory responsiveness of newborns dictates that signal presentations be separated by a minimum of 15 s. Furthermore, this paradigm requires that there be 8 presentations of the signal and that two responses among the 8 trials should be taken ...
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