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Thank you for your prompt response. I concur with your assessment. Upon reviewing the analysis I conducted, I have come to realize that my initial perception of 50 Hz as the primary artifact frequency was based on certain spectrograms I had plotted, revealing significant amplitude over 50 Hz. However, upon further examination of Fourier plots, it has become evident that the predominant noise indeed lies at 60 Hz. I sincerely appreciate your valuable input.
Sincerely,
Jesse Lo
Dear colleagues,
I am a sleep researcher specializing in polysomnography analysis. Currently, I am conducting research on the application of Fourier analysis to EEG signals, specifically focusing on the SHHS dataset.
During my analysis, I observed high energy peaks at 50 Hz in the EEG signals. This finding puzzled me, as the SHHS sleep data were collected in North America, where powerline artifacts typically occur at 60 Hz. Despite my efforts to gather information from previous articles, I have found limited literature addressing this particular issue.
I would greatly appreciate any insights or knowledge regarding the origins or explanations behind these observed peaks. Any assistance will be immensely appreciated.
Hello,
I was working with the Stanford Technology Analytics and Genomics in Sleep (STAGES) dataset, which included 3-D facial scans. Although the original images were not shared publicly, it was stated that key measurements and/or wire-overlay versions of the original images would be available in the publicly accessible databases. However, I could not find any related measurements in the files. Has anyone come across variables measuring facial features? Thank you for your help.