Functional architecture and mechanisms for 3D direction & distance in MT.

VSS 2019 Poster [PDF]

• 3D RF Position

  • Typical 2D grid is sampled in multiple depth planes

  • Light/dark dots drift in random cardinal direction through small spherical volumes

  • Rapid sequential presentation during binocular tracking of stable fixation

  ("all on" demo not representative of actual experiment stimuli)

• Direction-Disparity Tuning

  • Planar disc of light/dark dots moving frontoparallel to observer

  Sequential sampling of motion direction & stimulus depth

  • Motion sampled at 45° direction intervals

  • Depths spanning ±1.5° binocular disparity

• 2D & 3D Direction Tuning

  Example shows sequential walk through 2D & 3D direction planes

  • Large spherical volume of light/dark dots

  • Rendered with full binocular, expansion, & size-chage cues to depth

  • 3D motion sampled within 2D-frontoparallel (XY) or 3D (XZ) planes of direction

• 2D & 3D Direction Tuning

  Same as adjacent example, but presented in a pseudorandom sequence of directions (...akin to the actual experimental stimulus)