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Related Experiment Video

Updated: Nov 2, 2025

Measuring Attention and Visual Processing Speed by Model-based Analysis of Temporal-order Judgments

Measuring Attention and Visual Processing Speed by Model-based Analysis of Temporal-order Judgments

Published on: January 23, 2017

Automatic object-based spatial selection depends on the distribution of sustained attention.

Ema Shamasdin Bidiwala¹, Miranda Scolari²

¹Department of Psychological Sciences, Texas Tech University, MS 2051, Lubbock, TX, 79409, USA.

Attention, Perception & Psychophysics

|June 16, 2021

Summary

Object-based attention deployment depends on attentional scope. Narrow focus facilitates object-based effects, while broader attention dilutes them, suggesting attention doesn't always align with task goals.

Keywords:

Flanker task Inducer task Object-based attention Space-based attention Spatial spotlight

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Last Updated: Nov 2, 2025

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Published on: July 5, 2015

Area of Science:

Cognitive Psychology
Neuroscience
Visual Perception

Background:

Attentional selection mechanisms can be voluntary, influenced by task demands and observer scope.
Previous research presents conflicting findings on object-based attention (OBA) deployment.

Purpose of the Study:

To investigate factors influencing the involuntary deployment of object-mediated space-based attention.
To determine if OBA depends on the initial size of the attentional spotlight.

Main Methods:

Two experiments using a modified flanker task were conducted.
Experiment 1: Manipulated object frames (same vs. different) around targets and distractors.
Experiment 2: Varied sustained attentional scope using an inducer task.

Main Results:

Experiment 1 showed no significant difference in flanker effect magnitude between object grouping conditions.
Experiment 2 revealed OBA effects only when attention was narrowly focused on the target.
Broader attentional scope, encompassing the flanker, eliminated OBA effects.

Conclusions:

Object-based attention deployment appears contingent on a narrowly focused spatial attention.
OBA may not always operate in a strictly goal-oriented manner, potentially interfering with task objectives.
Findings reconcile inconsistent previous results on object-based selection.