Cortical responses to speech sounds and their formants in normal infants: maturational sequence and spatiotemporal analysis

Novak, Gerald; Kurtzberg, Diane; Kreuzer, Judith A.; Vaughan, Herbert G.

doi:10.1016/0013-4694(89)90108-9

Cited by 141 publications

(118 citation statements)

References 16 publications

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“…17 The establishment of thalamocortical connections within the cortical plate seems to occur concurrently in the frontal, 18 auditory, 19 somatosensory, 5 and visual cortices 20 and to coincide with significant functional changes, such as the appearance of evoked and event-related potentials. 29,30 Thus, this developmental stage is characterized by the first appearance of two parallel and concurrent functional circuits in the developing neocortex: (1) the functional thalamocortical connection of the periphery with the cortex, which can be consistently activated by external stimulation; and (2) the endogenous and spontaneously active circuitry of the subplate zone. 24,25 The functional overlap and putative interactions of these parallel circuits occur at the level of the subplate zone, are mediated by subplate neurons, and reach their peak after the 24th POW.…”

Section: Comparison Of Mri and Histological Findingsmentioning

confidence: 99%

Prolonged coexistence of transient and permanent circuitry elements in the developing cerebral cortex of fetuses and preterm infants

Kostović

Judaš

2006

Develop Med Child Neuro

135

117

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The aim of this paper is to evaluate correlative magnetic resonance imaging (MRI) and histological parameters of development of cortical afferents during pathfinding and target selection in transient fetal cerebral laminas in human fetuses and preterm infants. The transient fetal subplate zone, situated between the fetal white matter (i.e. intermediate zone) and the cortical plate, is the crucial laminar compartment for development of thalamocortical and corticocortical afferents. The prolonged coexistence of transient (endogenously active) and permanent (sensorydriven) circuitry within the transient fetal zones is a salient feature of the fetal and preterm cortex; this transient circuitry is the substrate of cerebral functions in preterm infants. Another transient aspect of organization of developing fibre pathways is the abundance of extracellular matrix and guidance molecules in periventricular crossroads of projection and corticocortical pathways. Both the subplate zone and periventricular crossroads are visible on MRI in vivo and in vitro. Hypoxic-ischaemic lesions of periventricular crossroads are the substrate for motor, sensory, and cognitive deficits after focal periventricular leukomalacia (PVL). Lesions of distal portions of the white matter and the subplate zone are the substrate for diffuse PVL. The neuronal elements in transient fetal zones form a developmental potential for plasticity after perinatal cerebral lesions.Our understanding and interpretation of structural and functional consequences of cerebral lesions in human fetuses and preterm infants largely depends on knowledge of neurogenetic cellular events that can be demonstrated by in vivo neuroimaging. A necessary step in this approach is the correlation between magnetic resonance imaging (MRI) and histological organization during different phases of histogenesis. Namely, in the fetal cerebrum, early neurogenetic cellular events (i.e. proliferation, migration, aggregation, cell death, growth of axons, and the establishment of neuronal connections) proceed according to the specific timetable within transient, histologically recognizable fetal zones which do not have an equivalent in the adult brain. 1 During the last third of gestation, neuronal proliferation and migration are mostly completed 1 whereas the development of axonal pathways 2,3 and the differentiation of cortical neurons 4 become the most prominent neurogenetic events. Synaptogenesis continues as the dominant neurogenetic event during postnatal life. In addition to precise timing, these neurogenetic events also display a characteristic spatial occurrence: neuronal proliferation occurs in the ventricular and subventricular zones, whereas neuronal migration and growth of axons occur predominantly in the intermediate zone (the fetal white matter) and the subplate zone, which is situated between the intermediate zone and the cortical plate. 1 Neuronal differentiation and synaptogenesis begin in the transient subplate zone 5 and continue in the cortical plate. 1,5 Recent research in...

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Section: Comparison Of Mri and Histological Findingsmentioning

confidence: 99%

Prolonged coexistence of transient and permanent circuitry elements in the developing cerebral cortex of fetuses and preterm infants

Kostović

Judaš

2006

Develop Med Child Neuro

135

117

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“…Variations in dipole orientations may contribute to the biphasically changing ERP amplitudes. These changes may be due to the consequence of different maturation rate of cerebral layers and connectivity [23]. The amplitude variations may also be caused by changes in the planum temporale secondary to the growth of frontal lobes [10].…”

Section: Morphological Changes Of Erp Componentsmentioning

confidence: 99%

Brain responses to tonal changes in the first two years of life

Jing

Benasich

2006

Brain and Development

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Maturation of auditory perceptual and discrimination process within the first two years of life is investigated in healthy infants by examining event-related potentials (ERPs). High-density EEG signals were recorded from the scalp monthly between 3 and 24 months of age. Two types of stimuli (100 vs. 100 Hz for standard stimuli; 100 vs. 300 Hz for deviant stimuli; occurrence rate: 85:15%) were presented using an oddball paradigm. Latencies and amplitudes were compared across development. The results showed that latencies of P 150 , N 250 , P 350 , and N 450 components gradually decreased with increasing age. Amplitudes of the N 250 and P 350 components gradually increased and reached the maximum at 9 months, and then gradually decreased with the increase of age. Mismatch negativity was not obvious at 3 months of age, but was seen at 4-5 months and became robust after 6 months. Robust late positivity was recorded at all ages. These mismatch responses were noticeable in the frontal, central, and parietal areas, and the maximal MMN amplitude distribution gradually moved from the parietal area to the frontal area across the age range. Two important periods-one around 6 months and the other around 9 months are suggested in the maturation of auditory central system. Dynamical changes in the underlying source strengths and orientations may be principal contributors to ERP morphological changes in infants within the first 24 months.

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“…However, there exists a certain issue that neither behavioral nor electrophysiological studies could resolve completely, a developmental process of hemispheric specialization. Many ERP studies as well as dichotic listening studies have attempted to explore this issue; however, their results are diverse (Novak et al, 1989;. The issue remains controversial.…”

Section: Introductionmentioning

confidence: 99%

Neural Attunement Processes in Infants during the Acquisition of a Language-Specific Phonemic Contrast

Minagawa‐Kawai¹,

Mori²,

Naoi³

et al. 2007

J. Neurosci.

137

123

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To elucidate the developmental neural attunement process in the language-specific phonemic repertoire, cerebral hemodynamic responses to a Japanese durational vowel contrast were measured in Japanese infants using near-infrared spectroscopy. Because only relative durational information distinguishes this particular vowel contrast, both first and second language learners have difficulties in acquiring this phonemically crucial durational difference. Previous cross-linguistic studies conducted on adults showed that phonemespecific, left-dominant neural responses were observed only for native Japanese listeners. Using the same stimuli, we show that a larger response to the across-category changes than to the within-category changes occurred transiently in the 6-to 7-month-old group before stabilizing in the groups older than 12 months. However, the left dominance of the phoneme-specific response in the auditory area was observed only in the groups of 13 months and above. Thus, the durational phonemic contrast is most likely processed first by a generic auditory circuit at 6 -7 months as a result of early auditory experience. The neural processing of the contrast is then switched over to a more linguistic circuit after 12 months, this time with a left dominance similar to native adult listeners.

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Cortical responses to speech sounds and their formants in normal infants: maturational sequence and spatiotemporal analysis

Cited by 141 publications

References 16 publications

Prolonged coexistence of transient and permanent circuitry elements in the developing cerebral cortex of fetuses and preterm infants

Prolonged coexistence of transient and permanent circuitry elements in the developing cerebral cortex of fetuses and preterm infants

Brain responses to tonal changes in the first two years of life

Neural Attunement Processes in Infants during the Acquisition of a Language-Specific Phonemic Contrast

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