Hi everyone.
Recently, our lab wants to try recording auditory event-related potentials (FFR, MMN, & P300) from CI users. But we are a little confused about the recording techniques. Since CI transfers the sound it "hears" into electrical impulses, EEG recording may be severely interfered by the artifacts.
Our questions are:
1. Is there any way that we can eliminate such electrical artifacts?
2. Is it possible for us to record steady-state potentials like FFR or ASSR from CI users? (Since the FFR or the ASSR dynamically follows the stimulus sound like a "sound recorder" in the brain, we are afraid that the electrical artifacts from CI may totally swamp the brain activities.)
3. If we want to record MMN from CI users using an oddball paradigm, and we use stimulus sounds with long duration (e.g. 150~200 ms), will the electrical artifacts swamp the MMN?
Thank you!
Hi, I have no exact answers to your questions but perhaps you will find some answers in this paper. I know they had to deal with artifacts from the CI.
https://www.researchgate.net/publication/306023081_Semantic_Processing_in_Deaf_and_Hard-of-Hearing_Children_Large_N400_Mismatch_Effects_in_Brain_Responses_Despite_Poor_Semantic_Ability
Article Semantic Processing in Deaf and Hard-of-Hearing Children: La...
In the linked article the stimuli are images and we did not have to deal with CI-artifacts. However, in the same project we recorded MMN with CI users and yes, to do this you have to consider CI-artifacts. There is several ways to deal with it including ICA in the analysis or clever experimental designs. Do look into that literature. In our case the large spike artefact was earlier than the MMN, but the whole issue is complicated and should be dealt with carefully.
Best wishes!
https://www.ncbi.nlm.nih.gov/pubmed/?term=cochlear+implant+artifact
Thank you very much! @Thomas Hörberg @Petter Kallioinen
I have a further question about CI-artifacts. Are they similar in temporal waveform to the corresponding stimulus sounds? Because we intend to record a brainstem potential that basically resembles the stimulus sound in temporal waveform. We are afraid that ICA might remove this brainstem activity.
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