Figure 1.

Schematics of the MEG-to-MEG link and examples of ongoing MEG signals. Subjects seated in laboratories 5 km apart are communicating via landline phones during the MEG measurement. The experimenters at both sites can monitor online both data acquisition audio communication. The audio recording computer sends digital timing signals to the MEG data acquisition computers at both sites. Examples of the 10 s MEG signals from four temporal-lobe and four occipital-lobe gradiometers are given below, passband 0.1–40 Hz. The two lowest traces show the audio recording of speech while the participants counted numbers in alternation.