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Supplementary Material Single cell and multiunit signals were recorded by a multichannel recording

Summary: Supplementary Material
Single cell and multiunit signals were recorded by a multichannel recording
system (Plexon Inc, Texas) from 96 paralyne coated tungsten or platinum/iridium
electrodes (impedance 300 k) (Microprobe Inc. Maryland) implanted in the medial
intraparietal area (MIP), a subdivision of the parietal reach region (PRR), and area 5 (1)
of three rhesus monkeys trained to perform a memory reach task. One monkey (monkey
S) also had 64 electrodes implanted in the dorsal premotor area (PMd) in a separate
surgery. Each session consisted of a reach segment and a brain control segment. Trials
in both segments were initiated in the same way: after the monkeys acquired a central
red fixation point with the eyes and touched a central green target, a peripheral cue was
flashed indicating the location of one out of four, five, six, or eight reach targets (Figure
1a) (cue epoch). Reach targets were uniformly distributed around the central fixation
point. As soon as the fixation point and central green target were acquired, hand and eye
movements were restricted by a real time behavioural controller (LabVIEW, National
Instruments). Eye position was monitored using a scleral search coil (CNC Engineering,
monkeys S and O), or an infrared reflection system (ISCAN, monkey C) while hand
position was monitored using an acoustic touch screen (ELO Touch). In order to
successfully complete a trial, the monkeys were not allowed to move their eyes. In


Source: Andersen, Richard - Division of Biology, California Institute of Technology


Collections: Biology and Medicine