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Evaluation of Hemisphere Lateralization with Bilateral Local Field Potential Recording in Secondary Motor Cortex of Mice

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Normal aging selectively diminishes alpha lateralization in visual spatial attention.

Xiangfei Hong¹, Junfeng Sun², Jesse J Bengson³

¹School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; Center for Mind and Brain, University of California-Davis, Davis, CA 95618, USA.

|December 3, 2014

Summary

This summary is machine-generated.

Older adults can direct spatial attention but lack the alpha power lateralization seen in younger adults. This suggests aging alters neural mechanisms for attentional orienting.

Keywords:

Aging Alpha power Event-related potential Spatial attention Top-down control

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Area of Science:

Neuroscience
Cognitive Psychology
Human Aging Research

Background:

Visual spatial attention is crucial for daily functioning.
Alpha power lateralization in EEG is a known neural correlate of spatial attention in young adults.
Age-related cognitive changes may impact attentional mechanisms.

Purpose of the Study:

To investigate age-related differences in cue-induced alpha power lateralization during visual spatial attention.
To compare neural signatures of spatial orienting between healthy older and younger adults.
To determine if alpha power lateralization diminishes with normal aging.

Main Methods:

Electroencephalography (EEG) was used to record brain activity.
Participants included healthy younger and older adults.
Event-related potentials (ERPs) and alpha power (8-13 Hz) were analyzed during a spatial attention task.

Main Results:

Younger adults exhibited cue-induced alpha power lateralization, but older adults did not.
Both age groups showed similar event-related potential (ERP) patterns (EDAN, ADAN, LDAP, CNV) indicative of spatial orienting.
Target-evoked sensory components were enhanced for attended targets in both younger and older adults.

Conclusions:

Older adults can successfully allocate spatial attention, but may use different neural mechanisms than younger adults.
Alpha power lateralization during visual spatial attention appears to diminish with normal aging.
Age-related changes in neural processing impact specific aspects of attentional orienting.