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Frame of reference transformations in motion perception during smooth pursuit eye movements
Jan L Souman1, Ignace Th C Hooge, Alexander H Wertheim
1Department of Psychonomics, Helmholtz Institute, Utrecht University, The Netherlands. jan.souman@tuebingen.mpg.de
Journal of Computational Neuroscience
|March 3, 2006
Summary
Smooth pursuit eye movements involve an incomplete transformation from retinal to head-centric reference frames. This study measured both perceived speed and direction during pursuit, revealing consistent shifts in velocity matches across directions.
Area of Science:
- Neuroscience
- Visual Perception
- Human Motor Control
Background:
- Smooth pursuit eye movements are crucial for maintaining a stable visual image of moving objects.
- The visual system must transform retinal (eye-centered) information into a head-centric (world-centered) reference frame during pursuit.
- Previous studies examined either perceived speed or direction, but not both simultaneously, during pursuit.
Purpose of the Study:
- To investigate the frame of reference transformation during smooth pursuit eye movements by measuring both perceived speed and direction.
- To compare the performance of different computational models in explaining the observed motion perception during pursuit.
Main Methods:
- Developed a novel velocity matching task where participants matched perceived speed and direction during fixation to that during pursuit.
- Conducted two experiments varying head-centric and retinal stimulus speeds across different directions.
- Applied and compared classical linear models, and models by Turano and Massof (2001), and Freeman (2001) to the collected data.
Main Results:
- Velocity matches consistently shifted against the direction of pursuit across all tested stimulus directions, indicating an incomplete reference frame transformation.
- The degree of compensation for eye movements was found to be relatively constant regardless of stimulus direction.
- The model proposed by Turano and Massof (2001) provided the best fit to the experimental data, though differences among models were minimal.
Conclusions:
- The visual system's transformation from retinal to head-centric reference frames during smooth pursuit is incomplete.
- Current models require further refinement, particularly regarding the influence of retinal image characteristics on the eye movement signal.
- Future research should focus on incorporating retinal image properties into models of visual-motor integration during eye movements.
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