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Visualizing Visual Adaptation

Visualizing Visual Adaptation

Published on: April 24, 2017

Differences in intersaccadic adaptation transfer between inward and outward adaptation.

Fabian Schnier¹, Markus Lappe

¹Department of Psychology and Otto Creutzfeld Center for Cognitive and Behavioral Neuroscience, University of Muenster, Muenster, Germany.

Journal of Neurophysiology

|June 17, 2011

Summary

Outward saccadic adaptation transfers better to other saccade types than inward adaptation, driven by changes in saccade duration. Inward adaptation

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Area of Science:

Neuroscience
Ophthalmology
Motor Control

Background:

Saccadic adaptation adjusts saccade amplitude when a saccade is inaccurate.
Outward (gain increase) and inward (gain decrease) adaptation involve distinct neural processes.
Previous studies indicate limited transfer of inward adaptation to non-reactive saccades.

Purpose of the Study:

To investigate the transfer of outward and inward saccadic adaptation from reactive saccades to other saccade types (scanning, overlap, memory-guided, gap).
To determine the role of saccade duration and peak velocity in the transfer of adaptation.
To provide further evidence for distinct mechanisms underlying outward and inward saccadic adaptation.

Main Methods:

Reactive saccade adaptation (outward and inward) was induced.
Transfer of adaptation to scanning, overlap, memory-guided, and gap saccades was assessed.
Saccade duration and peak velocity were analyzed during adaptation and transfer.

Main Results:

Outward adaptation showed stronger transfer to scanning and overlap saccades compared to inward adaptation.
Transfer strength depended on saccade target visibility duration.
Outward adaptation transfer was associated with increased saccade duration across saccade types.
Inward adaptation transfer involved decreased peak velocity but not necessarily decreased saccade duration.

Conclusions:

Saccade duration and peak velocity are independent parameters of saccadic adaptation.
These parameters are differentially involved in the transfer of adaptation between saccade categories.
The findings support the notion that outward and inward saccadic adaptation are distinct processes.