A MOTOR-DRIVEN MINIATURE MULTIPLE MICROELECTRODE MANIPULATOR FOR RECORDING FROM THE CORTICAL NEUROPIL OF THE AWAKE MONKEY IN OPERANT-BEHAVIOR PARADIGMS

An improved version of the Blum and Feldman multiple microelectrode ma nipulator is described. The main innovation is a design based on minia turization and light weight (75 g), which allows head mounting with mi nimal disturbance to the animal in awake monkey operant behavior studi es. The major features of the previously described model are preserved : simultaneous independent manipulation of four microelectrodes, in or der to record from at least four single units, that may be crosscorrel ated. With the new design better adjustment of intermicroelectrode dis tances for studies of interneural distances of 300 microns to 7 mm, an d an easier automatic, computer-controlled monitoring of distances tra nsversed into the brain are possible.