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Resonance Technologies has a couple of fMRI compatible mouse/trackball products. They have a conventional style trackball, with 4 buttons, available for use with either a PC or Mac. These devices use conventional copper wire which passes through RF filters at the penetration panel. We have used one of these trackballs for a few years without degradation of EPI fMRI images. Resonance Technologies now offers a wireless infrared mouse which communicates optically through the scan room window. I have not tried their infrared mouse. By the way, we use their video goggles and non-pneumatic sound systems and are very impressed with them. Jerry Allison, Ph.D. Medical College of Georgia >>> JB_Pochon <[log in to unmask]> - 4/4/01 11:06 AM >>> Dear all, we are looking for a fMRI compatible mouse device for PC to be used in a SIGNA scanner (1.5 T). Does anybody know any suppliers or tricks to adapt a standart mouse for fMRI in order to avoid magnetic artefacts. Thanks for help ----------------------------------------------------------- Pochon Jean-Baptiste INSERM E007 "Neuropsychologie fonctionnelle : planification et memoire" Hopital de la salpetriere 47, Bd l'hopital Paris 75013 Fax : 33 1 42 16 53 57 mail : [log in to unmask] ----------------------------------------------------------