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The temporal impulse response function during smooth pursuit.

Jianliang Tong¹, Mahalakshmi Ramamurthy, Saumil S Patel

¹College of Optometry, 505 J. Davis Armistead Building, University of Houston, Houston, TX 77204-2020, USA.

Vision Research

|August 27, 2009

Summary

This summary is machine-generated.

Perceived motion smear during eye movements is reduced by faster visual processing. This acceleration of the temporal impulse response function (TIRF) during pursuit eye movements is direction-dependent.

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Area of Science:

Visual neuroscience
Perception psychology

Background:

Motion smear is perceived as reduced during smooth pursuit eye movements.
This reduction is asymmetric based on target and eye motion direction.

Purpose of the Study:

Investigate if reduced motion smear during pursuit correlates with an accelerated temporal impulse response function (TIRF).
Examine the role of extra-retinal signals in visual processing speed during eye movements.

Main Methods:

Experiment 1: Measured two-pulse increment sensitivity during fixation and pursuit.
Experiment 2: Measured temporal contrast sensitivity during fixation and pursuit with varying grating motion directions.
Modeled TIRFs using linear system fitting and Fourier synthesis.

Main Results:

The natural temporal frequency of TIRFs was ~10% higher during pursuit compared to fixation.
This acceleration was observed specifically when grating motion opposed pursuit eye movement direction.
Visual processing speed increases during pursuit, particularly for opposing motion.

Conclusions:

Extra-retinal signals likely contribute to reduced motion smear during pursuit.
This reduction is partly achieved by enhancing visual processing speed, preferentially for specific motion directions.