Figure 1.
Experimental setup and transient translation stimuli. (A) Schematic illustration of the virtual reality apparatus. Monkeys were seated on a motion platform, with six degrees of freedom, which provided the vestibular stimulus. Visual stimulus (optic flow) was displayed on the screen located in front of the monkey. (B) Illustration of the 26 movement trajectories used to measure 3D heading tuning curve, corresponding to all combinations of azimuth and elevation, in 45° increments from a sphere. (C) Motion Profile. All movements had a 2 s duration, originated from the center position, and had a Gaussian velocity profile (peak of 0.3m/s, dashed-square line) with a corresponding biphasic linear acceleration profile (peak of ±1 m/s2, dashed-dot line).