Stimulus-induced gamma rhythms are weaker in human elderly with mild cognitive impairment and Alzheimer’s disease

eLife

Keerthana Manikandan¹  Abhishek ML¹  Bhargavi Nagendra¹  Aditi Balakrishnan¹  Wupadrasta Santosh Kumar¹  Ranjini Garani Ramesh¹  Dinavahi VPS Murty¹  Supratim Ray¹  Simran Purokayastha¹  Mahendra Javali²  Naren Prahalada Rao³ 

[1] Centre for Neuroscience, Indian Institute of Science, Bengaluru, India;MS Ramaiah Medical College & Memorial Hospital, Bengaluru, India;National Institute of Mental Health and Neurosciences, Bengaluru, India;

关键词: gamma;    SSVEP;    EEG;    Alzheimer's disease;    mild cognitive impairment;    dementia;    Human;   

DOI  :  10.7554/eLife.61666

来源: eLife Sciences Publications, Ltd

【 摘 要 】

Alzheimer’s disease (AD) in elderly adds substantially to socioeconomic burden necessitating early diagnosis. While recent studies in rodent models of AD have suggested diagnostic and therapeutic value for gamma rhythms in brain, the same has not been rigorously tested in humans. In this case-control study, we recruited a large population (N = 244; 106 females) of elderly (>49 years) subjects from the community, who viewed large gratings that induced strong gamma oscillations in their electroencephalogram (EEG). These subjects were classified as healthy (N = 227), mild cognitively impaired (MCI; N = 12), or AD (N = 5) based on clinical history and Clinical Dementia Rating scores. Surprisingly, stimulus-induced gamma rhythms, but not alpha or steady-state visually evoked responses, were significantly lower in MCI/AD subjects compared to their age- and gender-matched controls. This reduction was not due to differences in eye movements or baseline power. Our results suggest that gamma could be used as a potential screening tool for MCI/AD in humans.

【 授权许可】

CC BY