The Optimic MEG microphone is a passive fiber optic microphone from the company Opto acoustics.


The microphone is connected to the Electro-Optic Unit (EOU 200, single channel) on the desktop which converts the optical signal to an electrical signal. The EOU unit is connected to the audio input channel of the stimulation PC, to a misc channel of the MEG and to speakers for feedback.


Due to the ‘low’ sampling rate of the MEG, most auditory waveforms can not be sampled by the MEG system. However, it is usually possible to observe the onset of the recorded sound.