Which of the following statements about the nature of MEG signals is CORRECT?单项选择题

A

Magnetic signals from postsynaptic potentials get distorted when crossing different tissues like the skull and the scalp.

B

Actional potentials are less likely to contribute to MEG signals because of their short durations.

C

MEG needs around 100,000 simultaneously active neurons to detect them, because it is sensitive to action potentials with small amplitudes.

D

Because MEG signals are not affected by tissue conductivity, the orientations of neurons do not affect MEG signal strengths.

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