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Related Experiment Video

Updated: Feb 8, 2026

Efficiently Recording the Eye-Hand Coordination to Incoordination Spectrum

Efficiently Recording the Eye-Hand Coordination to Incoordination Spectrum

Published on: March 21, 2019

Fixed-target efficient search has logarithmic efficiency with and without eye movements.

Gavin Jun Peng Ng¹, Alejandro Lleras², Simona Buetti²

¹Department of Psychology, University of Illinois, Urbana, IL, USA. gavin.jp.ng@gmail.com.

Attention, Perception & Psychophysics

|July 8, 2018

Summary

This summary is machine-generated.

Efficient visual search reaction times increase logarithmically with set size, even without eye movements. This supports a parallel, unlimited capacity model for early visual processing, with search efficiency improving when eye movements are restricted.

Keywords:

Efficient search Exhaustive Eye movements Visual search

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Area of Science:

Cognitive Psychology
Visual Perception
Human Factors

Background:

Early visual search stages were thought to be unaffected by set size or distractor similarity.
Previous research indicated logarithmic increases in reaction times with set size, suggesting parallel, unlimited, and exhaustive processing.
The role of eye movements in these findings was previously unexamined.

Purpose of the Study:

To determine if logarithmic reaction time functions in efficient visual search are an artifact of eye movements.
To further investigate the cognitive architecture of Stage 1 visual processing.
To examine the effect of restricting eye movements on visual search efficiency.

Main Methods:

Participants performed fixed-target efficient visual search tasks.
Eye movements were monitored and participants were instructed to maintain fixation.
Reaction times were recorded and analyzed as a function of set size and target-distractor similarity.

Main Results:

Logarithmic reaction time functions emerged even when participants were prevented from making eye movements.
The slope of these logarithmic functions was modulated by target-distractor similarity.
Search efficiency slightly improved under restricted eye movement conditions, particularly with high lure-target similarity.

Conclusions:

The logarithmic nature of reaction time functions in efficient visual search is not an artifact of eye movements.
Findings support a parallel, unlimited capacity, and exhaustive Stage 1 visual processing architecture.
Restricting eye movements may enhance visual search efficiency in specific conditions.