The experiments were conducted in the same laboratory as that described for the monkey portions of ref.8 (link). Briefly, the monkeys were seated in a darkened booth ~ 72 cm from a calibrated and linearized CRT display spanning ~ 31° horizontally and ~ 23° vertically. Data acquisition and stimulus control were managed by a modified version of PLDAPS69 (link), interfacing with the Psychophysics Toolbox70 (link)–72 and an OmniPlex data acquisition system (Plexon, Inc.).
The monkeys were prepared for behavioral training and electrophysiological recordings earlier73 (link),74 (link). Specifically, each monkey was implanted with a head-holder and scleral search coil in one eye73 (link). The search coil allowed tracking eye movements using the magnetic induction technique75 (link),76 (link), and the head-holder comfortably stabilized head position during the experiments. The monkeys also each had a recording chamber centered on the midline and tilted 38° posterior of vertical, allowing access to both the right and left SC.
The monkeys were prepared for behavioral training and electrophysiological recordings earlier73 (link),74 (link). Specifically, each monkey was implanted with a head-holder and scleral search coil in one eye73 (link). The search coil allowed tracking eye movements using the magnetic induction technique75 (link),76 (link), and the head-holder comfortably stabilized head position during the experiments. The monkeys also each had a recording chamber centered on the midline and tilted 38° posterior of vertical, allowing access to both the right and left SC.
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