Object-centered reference frames in depth as revealed by induced motion.

Area of Science:

• Cognitive Neuroscience
• Visual Perception
• Computational Neuroscience

Background:

• Object-centric reference frames are crucial for spatial representation, coding objects relative to each other.
• Induced motion, where an inducer frame's motion influences a target's perceived motion, supports object-centric representations.
• Previous models primarily focused on planar motion filters.

Purpose of the Study:

• To investigate if induced motion incorporates three-dimensional (3D) scene constraints.
• To explore the role of depth cues (perspective and binocular disparity) in 3D induced motion.
• To examine the influence of reference frame representation on perceived motion.

Main Methods:

• An induced motion display was used with a slanted inducer frame.
• Depth was cued using perspective and binocular disparity.
• The inducer frame oscillated perpendicularly to the line of sight.
• Participants matched perceived 3D motion of a target dot using a rotatable rod.

Main Results:

• Participants perceived target dot motion in depth, even when the inducer frame did not move in depth.
• Perceived motion direction (along or against the slant) depended on the depth cue used (perspective vs. disparity).
• Induced motion perception is influenced by 3D scene information, not solely planar motion filters.

Conclusions:

• Induced motion perception is not limited to 2D planar motion but integrates 3D scene constraints.
• Depth cues significantly influence the direction and nature of perceived 3D induced motion.
• Findings highlight the complexity of reference frame representations and depth cue uncertainty in visual perception.