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Related Experiment Video

Updated: Jun 11, 2025

Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity

Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity

Published on: March 18, 2019

Dynamics of Saccade Trajectory Modulation by Distractors: Neural Activity Patterns in the Frontal Eye Field.

Hamidreza Ramezanpour^1,2,3, Devin Heinze Kehoe^4,3,5,6, Jeffrey D Schall^4,2,3

¹Centre for Vision Research, York University, Toronto, Ontario M3J 1P3, Canada hamidram@yorku.ca mfallah@uoguelph.ca.

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

|October 1, 2024

Summary

Visual distractors can alter eye movement trajectories, influencing saccade paths. Neural activity in the frontal eye field reflects this, showing attraction or repulsion based on distractor location and processing time.

Keywords:

competition curvature frontal eye fields oculomotor system saccade

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Last Updated: Jun 11, 2025

Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity

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Area of Science:

Neuroscience
Oculomotor Research
Cognitive Science

Background:

Visual distractors presented before saccade initiation can capture spatial attention.
This attentional capture can alter planned eye movement trajectories, leading to curved saccades.

Purpose of the Study:

To investigate the neural mechanisms in the frontal eye field (FEF) underlying saccade trajectory modulation by visual distractors.
To understand how FEF neuronal activity encodes the direction of curved saccades influenced by distractors.

Main Methods:

Single-neuron recordings were performed in the frontal eye field of two rhesus monkeys.
Monkeys executed saccades to a target while visual distractors appeared at varying delays and locations (ipsilateral/contralateral).

Main Results:

Presaccadic frontal eye field activity at the distractor location encoded saccade curvature direction (stronger for attraction, weaker for repulsion).
Visually responsive neurons showed dynamic excitatory responses, encoding attraction early and repulsion later in distractor processing.
These effects were observed regardless of distractor laterality relative to the recording site.

Conclusions:

Saccadic motor planning involves dynamic, push-pull interactions between brain hemispheres.
These interactions generate attractive or repulsive forces influencing eye movements towards or away from potential, unselected targets.