for a behavioral study we need to control eye movements in a convenient way. We tried to record external eye - but not scalp - electrodes with our Active Two system. However, there is an error message reporting a ringbuffer overflow. This might be related to the missing DRL and an inadequate config-file, for we use the one for included scalp electrodes.
What is the best (=easiest ) solution for the problem?
A ringbuffer overflow means that the PC is not able to keep up with the incoming data stream. Basically, the problem can only be solved with a faster processor in your acquisition PC
A CMS and DRL electrodes is always necessary, also if you only use the flat electrodes (EX inputs).
The ringbuffer overflow problem is not directly connected with CMS/DRL or CFG isues. However, CMS/DRL problems, or loose hanging channels can cause rail-to-rail noise traces, which need more processor power to display. This may eventually cause a buffer overflow in cases were there is not much headroom in terms of processor power to begin with.
Reducing the sample rate, switching off filters, and only displaying a limited number of channels decreases the processor load during acquisition.
that's interesting! I think we didn't encounter performance problems recently. But until now, we didn't try to record externals only.
about the recording of eye channels: What a pity that there is no easy solution for that. however, thx coen for the nice reply!
If you could record previously with many headcap channels, then there should be no problem at all with recording just the 8 EXG electrodes. You will just need the separate CMS/DRL lead (connection to the front panel of the AD-box).
) solution for the problem?