Interhemispheric EEG differences in olfactory bulbectomized rats with different cognitive abilities and brain...

Area of Science:

• Neuroscience
• Alzheimer's Disease Research
• Electroencephalography (EEG)

Background:

• Alzheimer's disease (AD) is linked to EEG asymmetry and impaired interhemispheric integration.
• Direct links between EEG asymmetry, brain morphology, and cognition in AD models are lacking.

Purpose of the Study:

• To investigate the association between EEG asymmetry, beta-amyloid levels, and cognitive deficits in an Alzheimer's disease rat model.
• To explore alterations in brain electrical activity and their correlation with memory impairment.

Main Methods:

• Utilized bilateral olfactory bulbectomy (OBX) in rats as an AD model.
• Assessed learning and memory using the Morris water maze.
• Measured EEG spectra in frontal and occipital cortices.
• Quantified beta-amyloid levels post-mortem.

Main Results:

• OBX rats showed altered theta and beta EEG activity, with significant interhemispheric differences.
• EEG asymmetry changes correlated with cognitive performance (normal vs. impaired learning).
• Elevated beta-amyloid levels were observed, particularly in rats with abnormal learning (OBX(-)).

Conclusions:

• EEG asymmetry and altered brain electrical activity are associated with cognitive deficits in an AD model.
• Beta-amyloid accumulation correlates with the severity of cognitive impairment and EEG changes.
• Findings suggest EEG asymmetry as a potential biomarker for AD-related cognitive decline.