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Published on: April 28, 2016
Timing of iron deficiency and recognition memory in infancy
Fengji Geng1, Xiaoqin Mai2, Jianying Zhan3
1Department of Curriculum and Learning Sciences, Zhejiang University, Hangzhou, People's Republic of China.
Insights
Iron deficiency timing in early life impacts infant recognition memory neural activity. The effects of iron deficiency (ID) on brain responses vary by infant age and when the deficiency occurs.
Area of Science:
- Neuroscience
- Developmental Psychology
- Pediatrics
Background:
- Iron deficiency (ID) in early life can affect cognitive development.
- Understanding the neural correlates of recognition memory is crucial for assessing cognitive function.
- The timing of iron deficiency (gestational vs. infancy) may differentially impact brain development and function.
Purpose of the Study:
- To investigate the relationship between iron deficiency (ID) and neural correlates of recognition memory.
- To examine how the timing of ID (fetal-neonatal vs. infancy) and infant age (9 vs. 18 months) influence these neural correlates.
- To identify specific event-related potential (ERP) components associated with recognition memory in iron-deficient infants.
Main Methods:
- Utilized event-related potentials (ERPs) during a visual recognition memory task (mother vs. stranger face).
- Compared healthy term infants categorized by iron status at birth and 9 months.
- Defined fetal-neonatal ID, postnatal ID, and iron-sufficient groups based on specific iron measures.
Main Results:
- At 9 months, all groups showed differences in the negative component (Nc) amplitude for mother vs. stranger faces.
- At 18 months, only postnatal ID and iron-sufficient groups exhibited condition differences in Nc amplitude, with variations in brain regions.
- Late slow wave (LSW) differences were observed in both ID groups at 9 months but not at 18 months.
Conclusions:
- The timing of early-life iron deficiency (fetal-neonatal vs. postnatal) significantly modulates its impact on recognition memory.
- The age of the infant at testing (9 vs. 18 months) also influences how iron deficiency affects neural correlates of recognition memory.
- These findings highlight the critical role of iron status timing in early brain development and cognitive function.
Abstract:
Objective: To determine the relationship between iron deficiency (or iron-deficient, ID) and neural correlates of recognition memory depending on ID timing (gestation vs. infancy) and infant age at testing (9 vs. 18 months).Study design: Event-related potentials (ERP) were used in a visual recognition memory task (mother vs. stranger face) to compare healthy term infants according to iron status at birth and 9 months. Fetal-neonatal ID was defined as cord serum ferritin < 75 µg/l or zinc protoporphrin/heme ratio > 118 µmol/mol, postnatal ID as ≥ 2 abnormal iron measures at 9 months with normal cord-blood iron status, and iron-sufficient as not ID at birth or 9 months. Recognition of mother faces was measured by negative component (Nc) and late slow wave (LSW). These ERP components reflect attention and memory updating processes, respectively.Results: All groups showed differences in Nc amplitude elicited by mother and stranger faces at 9 months. At 18 months, only postnatal ID and iron-sufficient groups showed condition differences in Nc amplitude. However, the 2 groups were different in the involved brain regions. For LSW, only the 2 ID groups showed condition differences in amplitude at 9 months. At 18 months, condition differences were not observed in any group.Conclusions: This study indicates that the timing of ID in early life (fetal-neonatal vs. postnatal) modulates the impact of ID on recognition memory. Such impact also varies depending on the age of infants at testing (9 vs. 18 months).
