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Differential Cortical Pattern in Auditory Task Oddball Paradigm in Children Exposed to Alcohol during Pregnancy
Humberto de Oliveira Simões1, Sthella Zanchetta2, Erikson Felipe Furtado1
1Department of Neuroscience and Behavioral Sciences, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, SP, Brazil.
Insights
Children with prenatal alcohol exposure show distinct auditory processing differences. Electrophysiological recordings revealed altered P2 and P3a brainwave components, impacting cortical auditory signal analysis.
Area of Science:
- Neuroscience
- Developmental Psychology
- Audiology
Background:
- Fetal alcohol exposure negatively impacts child development.
- Electrophysiological processing of acoustic signals is crucial for auditory development.
- Understanding neurophysiological markers in children with prenatal alcohol exposure is essential.
Purpose of the Study:
- To investigate cortical electrophysiological processing of acoustic signals in adolescents with prenatal alcohol exposure.
- To compare neurophysiological responses between children exposed and unexposed to alcohol prenatally.
- To identify specific brainwave components affected by fetal alcohol exposure.
Main Methods:
- Observational, cross-sectional blind study design.
- Recruitment of 21 adolescents (13-14 years) from a longitudinal cohort.
- Neurophysiological recordings (N1, P2, N2, P3, P3a, P3b) using the Oddball paradigm.
Main Results:
- No significant differences in sociodemographic conditions or birth weight between groups.
- Lower Apgar scores observed in the alcohol-exposed group.
- Significant differences in P2 and P3a components, with higher amplitudes in the exposed group at specific electrode positions (Cz).
Conclusions:
- Prenatal alcohol exposure leads to distinct electrophysiological auditory processing in adolescents.
- Altered P2 component suggests impacts on bottom-up auditory mechanisms.
- Modified P3a component may indicate involvement of supra-modal hearing mechanisms in exposed individuals.
Abstract:
The negative effects of fetal alcohol exposure on child development are well documented. This study investigated the electrophysiological processing of cortical level acoustic signals in a group of 21 children prenatally exposed to alcohol. Participants aged 13-14 years at the time of the study were recruited from a longitudinal cohort sample. The study employed an observational, cross-sectional blind design and participants were divided into two groups: with and without fetal exposure to alcohol. Neurophysiological measures recorded N1, P2, N2, P3, P3a, and P3b components using the Oddball paradigm. Our results showed that the mothers' sociodemographic conditions at the time of birth, as well as the children's birth weights were homogeneous between the groups, though the Apgar score was lower in the exposed group (EG). The neurophysiological components that showed different results in the groups were P2 and P3a. P2 amplitude was higher in the midline central electrode (Cz) compared to the midline parietal electrode (Pz), demonstrating a group interaction for exposed children. For P3a there was an interaction of group and electrode position, and the EG showed higher amplitudes in Cz compared to the unEG. However, the Apgar score did not influence these results. In conclusion, children who had fetal exposure to alcohol presented electrophysiological recordings distinct from the control group. These differences occurred both in the P2 component - which reflects a bottom-up mechanism of auditory processing - as well as the P3a component, which may reflect the participation of supra-modal hearing mechanisms.
