We built a low-cost system for monitoring human skin conductance responses
(SCRs) in a clinical magnetic resonance (MR) scanner during functional imag
ing. The average scanner-induced conductance noise level was suppressed suf
ficiently to allow SCR measurements over the fall range of SCR amplitudes,
and functional image signal-to-noise ratio was unaffected by the skin condu
ctance apparatus. The system may be useful for a variety of imaging studies
. (C) 2001 Wiley-Liss, Inc.