Detection of auditory evoked responses with atomic magnetometer

H. Xia, A. Ben-Amar Banranga, D. Hoffman, M. V. Romalis

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


We demonstrate the first detection of brain magnetic fields evoked by auditory stimulation with a non-cryogenic optical magnetometer. We use a spin-exchange-relaxation-free (SERF) alkali-metal magnetometer and map magnetic fields using multi-channel photodiode arrays. This first-generation system has a magnetic noise level of 3.5 fT/Hz1/2 at 10 Hz, similar to the state-of-the-art cryogenic systems. Absence of a cryogenic dewar eliminates magnetic Johnson noise and allows the use of compact magnetic shields with a high shielding factor.

Original languageEnglish (US)
Pages (from-to)627-630
Number of pages4
JournalInternational Congress Series
StatePublished - Jun 2007

All Science Journal Classification (ASJC) codes

  • General Medicine


  • Atomic magnetometer
  • Auditory evoked response
  • Magnetoencephalography
  • Spin-exchange-relaxation-free


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