Elsevier

Vision Research

Volume 18, Issue 10, 1978, Pages 1279-1296
Vision Research

Primary and secondary saccades to goals defined by instructions

https://doi.org/10.1016/0042-6989(78)90218-3Get rights and content

Abstract

A luminous point steps horizontally in the dark, and the subject tracks it (normal task), or is instructed to respond by some other horizontal eye movement (e.g. an equal and opposite movement — the “anti-saccade” task). Eye movements in the “anti-task” are characterized by long latency, inaccurate primary saccades which sometimes show minor anomalies in velocity profile. The secondary saccades are large, corrective, of shorter than primary latency, and are not based on retinal feedback. Thus, the human saccadic system is optimized for, but not restricted to, foveation. The highly idiosyncratic “anti” latency data can be normalized by reference to the Wheeless 2-step paradigm. A mechanism is proposed.

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