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Investigating developmental changes in sensory processing: visual mismatch response in healthy children.
Katherine M Cleary1, Franc C L Donkers2, Anna M Evans1
1Department of Psychiatry, School of Medicine, University of North Carolina at Chapel Hill Chapel Hill, NC, USA.
Frontiers in Human Neuroscience
|January 14, 2014
Summary
Children aged 8-12 show distinct visual mismatch responses (vMMR) compared to adults, indicating developmental differences in processing unattended visual changes. This visual homolog of auditory mismatch negativity differs across age groups.
Area of Science:
- Cognitive Neuroscience
- Developmental Psychology
- Visual Perception
Background:
- Detecting environmental changes is crucial for adaptation.
- Auditory mismatch negativity (MMN) is well-studied, but its visual counterpart (vMMR) is less understood, especially in children.
- Previous vMMR research primarily focused on adult populations.
Purpose of the Study:
- To investigate the developmental nature of the visual mismatch response (vMMR) in children.
- To compare vMMR in healthy children (8-12 years) with healthy adults (18-42 years).
- To explore differences in processing unattended visual stimuli between age groups.
Main Methods:
- Electroencephalography (EEG) data were recorded from 22 children and 20 adults.
- Participants performed a visual target detection task with varying background grating spatial frequencies (high vs. low).
- Task-irrelevant background stimuli served as standard (high spatial frequency) and deviant (low spatial frequency) conditions.
Main Results:
- Adults exhibited a robust vMMR around 150 ms at occipital electrodes.
- Children showed two negativities (around 150 and 230 ms) at occipital sites and a frontal positivity around 250 ms.
- Children displayed larger P1 amplitudes and longer P1/N1 latencies to deviant stimuli compared to adults.
Conclusions:
- Visual stimulus processing outside the focus of attention differs between 8-12-year-old children and adults.
- The findings align with previous research on visual event-related potential (ERP) development.
- The visual mismatch response (vMMR) likely undergoes developmental changes across the lifespan.
