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Does the Brain Extrapolate the Position of a Transient Moving Target?

Julie Quinet¹, Laurent Goffart²

¹Institut de Neurosciences de la Timone, Unité Mixte de Recherche, 7289 Centre National de la Recherche Scientifique, Aix-Marseille Université, 13385 Marseille Cedex 5, France.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience

|August 28, 2015

Summary

The brain predicts moving object trajectories to guide eye movements (saccades). Target speed and acceleration influence saccade accuracy, demonstrating predictive capabilities in the visuo-saccadic system.

Keywords:

adaptation extrapolation interception prediction saccade visual motion

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Area of Science:

Neuroscience
Oculomotor control
Visuomotor transformation

Background:

Moving objects in the visual field generate retinal activity.
Retinal signals drive oculomotor commands for saccadic eye movements.
The superior colliculus plays a role in correcting saccade trajectories.

Purpose of the Study:

Investigate saccade generation towards transient moving targets.
Determine if saccades land on average positions or target disappearance points.
Examine the sensitivity of converting retinal signals to oculomotor commands based on target motion profiles.

Main Methods:

Head-restrained monkey model.
Transient moving targets with varying speed profiles (100-200 ms duration).
Analysis of saccade landing positions in relation to target trajectory and speed.

Main Results:

Saccades toward faster targets land further than those toward slower targets.
Saccade amplitude is smaller for accelerating targets compared to decelerating ones.
Early motion signals are more critical for saccade amplitude than later signals.

Conclusions:

The visuo-saccadic system exhibits predictive properties.
Motion extrapolation and prediction are crucial for adjusting ongoing actions to dynamic goals.
Findings contribute to understanding the neural basis of predictive eye movements.