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The nonlinear structure of motion perception during smooth eye movements
1Department of Psychology & Center for Neural Science, New York University, New York, NY 10003, USA. camille.morvan@gmail.com
Journal of Vision
|September 19, 2009
Summary
Perceiving object motion during eye movements involves direct perception or compensation. This study found that motion compensation is nonlinear, especially when objects move opposite to eye direction, suggesting complex signal integration.
Area of Science:
- Neuroscience
- Vision Science
- Perception
Background:
- Perceiving object motion during eye movements requires either direct motion perception or compensation for eye movement.
- Compensation involves correcting retinal motion using eye movement information.
Purpose of the Study:
- To investigate the mechanisms of motion perception compensation during smooth eye movements.
- To determine if a linear model adequately explains motion compensation.
Main Methods:
- Created stimuli where object motion was decoupled from eye motion during smooth pursuit.
- Utilized a wide range of stimulus speeds and directions.
- Ruled out linear compensation models.
Main Results:
- Compensation was minimal when stimulus and eye movement were in the same direction.
- Compensation increased nonlinearly with speed when stimulus and eye movement were in opposite directions.
- A linear model of compensation was insufficient to explain the findings.
Conclusions:
- Eye movement estimation involves both extraretinal and retinal signals.
- Retinal signals may rely on an assumption of stimulus stationarity.
- Proposed models suggest direction is derived from extraretinal signals and speed from retinal signals.
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