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Cortical Source Analysis of High-Density EEG Recordings in Children
Published on: June 30, 2014
Age-related differences in cortical activity during a visuo-spatial working memory task with facial stimuli
Flávia Schechtman Belham1, Corina Satler, Ana Garcia
1Laboratory of Neuroscience and Behavior, Department of Physiological Sciences, University of Brasilia, Brasilia, Brazil.
Plos One
|September 27, 2013
Summary
Young adults better recall negative emotional events, showing distinct brain activity compared to older adults. This study found evidence supporting the Negativity Bias Hypothesis, not the Positivity Effect Hypothesis.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Gerontology
Background:
- Emotion significantly impacts memory, with age-related differences in processing emotional stimuli.
- Young adults (YA) are theorized to exhibit a Negativity Bias, while older adults (OA) may show a Positivity Effect.
- Investigating age-related cortical activity during emotional memory tasks is crucial for understanding cognitive aging.
Purpose of the Study:
- To compare the electroencephalographic (EEG) activity of young and older adults during a visuo-spatial working memory task with emotional stimuli.
- To determine if age-related differences in memory recall align with the Negativity Bias Hypothesis or the Positivity Effect Hypothesis.
- To explore the influence of emotional valence (neutral, positive, negative faces) on cognitive performance and brain activity across different age groups.
Main Methods:
- Electroencephalographic (EEG) recordings using a 21-electrode montage were performed on 27 young adults and 25 older adults.
- Participants completed the Spatial Delayed Recognition Span Task, viewing neutral, positive, and negative faces, and geometric pictures.
- Performance metrics and spectral power in theta and alpha bands were analyzed in relation to age and stimulus type.
Main Results:
- Young adults outperformed older adults, exhibiting greater theta and alpha band activation in frontal and midline regions, and right-hemispheric alpha asymmetry.
- Both age groups performed worse on positive faces compared to neutral and negative faces.
- Facial stimuli, compared to geometric figures, improved performance and modulated alpha band activity differently in young and older adults.
Conclusions:
- The findings support the Negativity Bias Hypothesis in young adults and do not provide evidence for the Positivity Effect in older adults.
- Age-related differences in cortical activity during emotional memory processing were identified, particularly in areas related to attention and decision-making.
- The study highlights the utility of EEG in revealing age-specific neural mechanisms underlying emotional mnemonic processing.
