The following press conferences at the American Physical Society (APS) March Meeting will take place in room 516 of the Los Angeles Convention Center. The newsroom itself will be room 517, where the phone numbers are 213-743-6237 and -6238; the fax number is 213-741- 3924.

MAGNETIC SOURCE IMAGING (MSI).

Tuesday, March 17, 1 PM. In MSI, super-sensitive superconducting detectors sample the tiny magnetic fields that come from electrical signals flowing through the body. MSI has some advantages over more established imaging methods such as MRI or PET in that it has a sharper time resolution (it can produce more images per second) and does not base its imaging on local blood flow (which can lag behind the actual activity of interest, in the heart or brain, say). Sam Williamson of NYU (212-998-7692) has previously made detailed maps of the auditory cortex, showing where in the brain tones of different pitch are perceived. Now (paper K25.02) he will report on the behavior over time of signals received in the various stages of the visual cortex.