These results reveal a novel role for visual cues in achieving a rotation-invariant representation of heading in the macaque ventral intraparietal area.
These results support the hypothesis of multi-sensory convergence of visual and non-visual cues to provide consistent rotation information, which may be critical for encoding rotations, in addition to achieving a rotation-invariant representation of heading.
Results from the 3D cloud experiment demonstrate, for the first time at the neural level, a clear contribution of visual cues in achieving a rotation-tolerant representation of heading.
Therefore, in general, multiple non-visual signals would need to be added to achieve a rotation-invariant estimate of heading, potentially compounding the noise that is associated with each signal (Gellman and Fletcher, 1992; Li and Matin, 1992; Crowell et al., 1998).
Thus, this method of achieving a general rotation not only avoids the (recursive) computation of the Wigner functions Γ n (which itself costs O ( p 3 ) operations), but also benefits from the facts that the swap matrices B n have ≈4 times fewer non-zero entries than the Γ n and are known a priori, such that they can be 'hard-wired' into computer code.
In addition, to achieve a smoother rotation of the fan, they optimized the drive circuit [15].
The measured static and dynamic characteristics show that the micromirror can achieve a maximal rotation angle of 0.87° with a Direct Current (DC) driving voltage of 156 V.
With this process, prototype actuators with a width of 7 mm and a thickness of 0.65 mm have been made that achieved a twisting rotation of 6.5°/mm actuator length at a pressure of 178 kPa.
The measured static and dynamic characteristics show that the scanning mirror can achieve a maximal rotation angle of 2.3° with a direct current (DC) driving voltage of 95 V.
The controller solution utilizes the quaternion representation to achieve a shorter rotation path on commanded attitude changes, and the equilibrium points of the closed-loop system are proved to be uniformly asymptotically stable.
The patients were placed supine on the scan table with a foot support to achieve a standard rotation of the hip.
