Spikes when using response box
Posted: Fri Oct 22, 2021 11:04 am
Hi everyone,
I've noticed strange spikes in my data when using the biosemi response-box.
I have 64 channels recordings on a couple of subjects while they had to respond to a task using the Biosemi response-box (RespSwitch=1). The recordings were done in an shielded booth with the ADC box next to the subject.
At the onset and offset of the response trigger, the signal displays a big spike (here the data are not rereferenced, not filtered, just epoched and with the baseline removed).
These spikes are consistent across trials, and can be seen in EDFbrowser.
I don't see them with recordings with electrodes in a bucket with water and salt.
Does anyone had similar results or has an idea where these artifacts might be coming from ?
Best,
Thomas
I've noticed strange spikes in my data when using the biosemi response-box.
I have 64 channels recordings on a couple of subjects while they had to respond to a task using the Biosemi response-box (RespSwitch=1). The recordings were done in an shielded booth with the ADC box next to the subject.
At the onset and offset of the response trigger, the signal displays a big spike (here the data are not rereferenced, not filtered, just epoched and with the baseline removed).
These spikes are consistent across trials, and can be seen in EDFbrowser.
I don't see them with recordings with electrodes in a bucket with water and salt.
Does anyone had similar results or has an idea where these artifacts might be coming from ?
Best,
Thomas