Predictive saccade in the absence of smooth pursuit: interception of moving targets in the archer fish

2012 ◽  
Vol 215 (24) ◽  
pp. 4248-4254 ◽  
Author(s):  
A. Ben-Simon ◽  
O. Ben-Shahar ◽  
G. Vasserman ◽  
R. Segev
Keyword(s):  
Smooth Pursuit ◽  
Moving Targets ◽  
Predictive Saccade

Coordination of Smooth Pursuit and Saccade Target Selection in Monkeys

2007 ◽  
Vol 98 (4) ◽  
pp. 2206-2214 ◽  
Author(s):  
Gilbert R. Case ◽  
Vincent P. Ferrera
Keyword(s):  
Smooth Pursuit ◽  
Target Selection ◽  
Saccade Target ◽  
Target Color ◽  
Smooth Pursuit Eye Movements ◽  
Moving Targets ◽  
Neural Signals ◽  
Pursuit Eye Movements ◽  
Selection For ◽  
Selection Signal

The coordination of saccadic and smooth pursuit eye movements in macaque monkeys was investigated using a target selection paradigm with two moving targets crossing at a center fixation point. A task in which monkeys selected a target based on its color was used to test the hypothesis that common neural signals underlie target selection for pursuit and saccades, as well as testing whether target selection signals are available to the saccade and pursuit systems simultaneously or sequentially. Several combinations of target color, speed, and direction were used. In all cases, smooth pursuit was highly selective for the rewarded target before any saccade occurred. On >80% of the trials, the saccade was directed toward the same target as both pre- and postsaccadic pursuit. The results favor a model in which a shared target selection signal is simultaneously available to both the saccade and pursuit systems, rather than a sequential model.

scholarly journals Comparison of the precision of smooth pursuit in humans and head unrestrained monkeys

2018 ◽  
Vol 11 (4) ◽  
Author(s):  
Jan Churan ◽  
Doris I. Braun ◽  
Karl R. Gegenfurtner ◽  
Frank Bremmer
Keyword(s):  
Smooth Pursuit ◽  
Human Subjects ◽  
Smooth Pursuit Eye Movements ◽  
Moving Targets ◽  
Decay Function ◽  
Experimental Conditions ◽  
Motion Onset ◽  
Pursuit Eye Movements ◽  
Optimal Values ◽  
Over Time

Direct comparison of results of humans and monkeys is often complicated by differences in experimental conditions. We replicated in head unrestrained macaques experiments of a recent study comparing human directional precision during smooth pursuit eye movements (SPEM) and saccades to moving targets (Braun & Gegenfurtner, 2016). Directional precision of human SPEM follows an exponential decay function reaching optimal values of 1.5°-3° within 300 ms after target motion onset, whereas precision of initial saccades to moving targets is slightly better. As in humans, we found general agreement in the development of directional precision of SPEM over time and in the differences between directional precision of initial saccades and SPEM initiation. However, monkeys showed overall lower precision in SPEM compared to humans. This was most likely due to differences in experimental conditions, such as in the stabilization of the head, which was by a chin and a head rest in human subjects and unrestrained in monkeys. 

Sign in / Sign up

Export Citation Format

Share Document