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Related Experiment Video

Updated: Nov 2, 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

Tool heads prime saccades.

Artur Pilacinski^1,2, Stella De Haan^3,4,5, Rita Donato^3,4,6,7

¹Proaction Laboratory, Faculty of Psychology and Educational Sciences, University of Coimbra, 3000-115, Coimbra, Portugal. ap@uc.pt.

Scientific Reports

|June 8, 2021

Summary

This summary is machine-generated.

Eye movements are automatically drawn to the functional parts of tools, specifically their heads. This research shows that the visual system prioritizes tool heads, influencing saccadic reactions even when tool function is task-irrelevant.

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Last Updated: Nov 2, 2025

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Area of Science:

Cognitive Neuroscience
Visual Perception
Human Motor Control

Background:

Tools are manipulated using handles, but their functional information resides in their heads (action-ends).
Understanding how the visual system processes object parts and guides motor actions is crucial for explaining human-object interaction.

Purpose of the Study:

To investigate whether eye saccadic movements are primed by tool handles or tool heads.
To determine if the visual system automatically processes functional object parts to orient eye movements.

Main Methods:

Measured human saccadic reaction times during an attentional task.
Presented participants with tools and monitored eye movements.

Main Results:

Saccadic eye movements were significantly faster when directed towards the side congruent with the tool head.
This effect occurred even when the 'toolness' of the object was irrelevant to the task.
Reaction times were not influenced by the tool handle.

Conclusions:

Tool heads are automatically processed by the visual system, influencing the orientation of eye movements.
The eyes are attracted to the functional parts of manipulable objects and the characteristic information they convey.
This suggests a rapid, automatic visual processing of object affordances that guides motor behavior.